019039   Goswami U;Patgiri A D;Sarma J N (Department of Applied Geology, Dibrugarh University, Dibrugarh-786 004) : Hydrological properties of soils from textural analysis: a case study of lower Subansiri basin, Assam. J Indian Ass Sedimentologists 1999, 18(2), 260-9.

Effective size value of soil from the Lower Subansiri basin, Assam varies from medium silt to very fine sand. The distribution of effective size value suggests relatively coarse nature of the soils in the north-eastern part of the area. The sorting coefficient value of soils ranges from well sorted to poorly sorted while the uniformity coefficient value of soils varies from uniformly graded to non-uniformly graded. The distribution of sorting coefficient and uniformity coefficient values indicates that the overall sorting of soils in the eastern part of the Subansiri rive is relatively better than soils of the western part and apart from a few locations in the eastern part, where soils are uniformly graded, the soils of the study area are by and large moderately graded in nature. An endeavour has been made to evaluate the hydrological properties of soils based on their textural characteristics. The higher percentage of sand in comparison to the percentage of silt and clay suggests a reasonably good porosity and permeability of soils. Based on effective size, sorting coefficient and uniformity coefficient values it is synthesised that owing to overall coarseness, better sorting and relatively more uniform grading of constituent grains, the soils of the eastern part of the Lower Subansiri basin are more porous and permeable compared to the western part of the basin.

019038   Dubey N;Chatterjee B K (Department of Geology, Banaras Hindu University, Varanasi-221 005) : Paleoclimate and depositional history of mesozoic basin of Kachchh, Gujarat. J Indian Ass Sedimentologists 1999, 18(2), 147-57.

In the kachchh pericratonic basin, Precambrian basement is unconformably overlain by 3000 m thick sedimentary succession of Middle Jurassic to Late Cretaceous age. Middle Jurassic transgression deposited retrogradational succession (RS) of marl-shale <62> limestone <62> sandstone during Aalenian/Bajocian to Callovian overlain by aggradational succession (AS) of condensed, sandy, oolitic limestone developed during sea-level highstand in Oxfordian. This proximally sandier hard ground represents maximum depth of deposition in the basin followed by sandstone and shale of AS deposited during Kimmeridgian - Tithonian transgression. However, during Lower Cretaceous, this trend reversed when progradational succession (PS) of sandstone <62> shale <62> limestone developed. Although, major part of Cretaceous period is globally marked as time of sea-level rise, tectonics related `forced regression' caused progradation of coastal facies. Mesozoic successions are characterised by the sandstones of first cycle sand derived from the weathering and erosion of coarse, crystalline Precambrian source terrain. Compositional maturity of sandstones determined on the basis of quartz, feldspar and rock fragment percentage (QFR) varies (88 : 8 : 4)-(89 : 10 : 5)-(85 : 12 : 5) for RS, AS and PS respectively.

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019037   Duarah B P;Das P K;Goswami D C (Department of Geological Sciences, Gauhati University, Guwahati) : Grain size analysis and textural parameters of the Puthimari river sediments near Puthimari village, Kamrup district, Assam. J Indian Ass Sedimentologists 1999, 18(2), 231-48.

Puthimari river sediments from a point bar at Puthimari village, Kamrup district, Assam have been analysed to determine the statistical parameters of the grain size distribution. The cumulative and frequency curves indicate that the sediments mostly possess bimodal distribution. Cumulative curves and log-probability plots indicate that major part of the sediments were carried in saltation. The study shows that the sediments are mainly fine sand to coarse silt, moderately sorted, nearly symmetrical to positive skewed and leptokurtic. Bivariant plots of various statistical parameters show that the plots commonly possess meaningful relationships. CM pattern shows that the sediments were carried as graded as well as uniform suspention. Textural classification shows that the sediments are silty sand.

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019036   Dholakia A;Deota B;Desai N (Department of Geology, Faculty of Science, M S University of Baroda, Vadodara-390 002) : Processes of sediment movement as revealed by grainsize parameters along the beaches of Goa, West coast of India. J Indian Ass Sedimentologists 1999, 18(2), 223-9.

An attempt is made to understand the spatial variation in textural characters of sediments along the beaches of Goa Coast and their implication in identifying the transportation and deposition mechanisms involved. Sediment analysis across and along the shore were utilised to identify the sediment movement and energy conditions in the study area. It is observed that the huge estuaries and promontories have played a major role in sediment movement and their grainsize distribution.

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019035   Dasgupta D K;Hegde V N;Das K K;Thakur R A (Regional Geology Laboratory, ONGC, Township Phase-I, Panvel, Navi Mumbai-410 221) : Sedimentation pattern and source rock potential of paleogene sequence, south of Bombay high oil field, India. J Indian Ass Sedimentologists 1999, 18(2), 211-22.

Paleogene sequence, south of Bombay High is known for its hydrocarbon potential and is a thrust area for future exploration. The sequence is divided into Panna, Bassein, Mukta and Panvel Formations. The Panna Formation consists mainly of fluvial sediments deposited over basaltic flows. The Bassein Formation comprises mainly of carbonates, foraminiferal wackestone to grainstone, indicating varying energy conditions of deposition, whereas, Mukta Formation is mainly low energy wackestone with shale. The youngest Panvel Formation consists mainly of dolomitic wackestone with alternate shale bands. The carbonate sediments were deposited under one mega regressive cycle. Bassein Formation has a good source generation potential. Short distance migration of hydrocarbon is confirmed by palynological studies of crude oil. The payzones are mainly from Bassein and Panna Fromations in which secondary porosity ie. vugs, channels, and moldic types are well preserved. The primary porosity in the formation was destroyed by sparitisation during early diagenesis.

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019034   Choudri B S;Chavadi V C (Department of Studies in Geology, Karnatak University, Dharwad-580 003) : Deposition of trace elements in the sediments of ponds around Lakamanahalli industrial area, near Dharwad city, Karnataka, India. Indian J envir Hlth 2001, 43(1), 34-7.

Sediments have been collected from Rayapur and Sattur ponds around Lakamanahalli industrial area and analysed for trace elements content viz., Cd, Pb, Ni, Cu, Zn, Mn, Fe and Cr. Sediments showed 2- fold increased level of studied elements concentration in comparison with relatively non - polluted values. Further, the results of "correlation coefficient and t-test" values indicate positive correlation in deposition and significant at 5% level of confidence. The higher content of these trace elements in the sediments is attributed to surrounding industrial activity.

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019033   Armstrong Altrin Sam J;Ramasamy S (Sedimentology Laboratory, Department of Geology, University of Madras, Chennai-600 025) : Granulometry, petrography, geochemistry and depositional environments of sand-rich sequence of Kundankulam formation, Tamilnadu. J Indian Ass Sedimentologists 1999, 18(2), 187-200.

Textural parameters such as mean, standard deviation, skewness and kurtosis for sand-rich units interbedded with Kudankulam limestone deposits indicate that these sands are coarse to medium grained, poorly to moderately well sorted, negatively to positively skewed and very platykurtic to leptokurtic. An attempt has been made to infer depositional environments through various bivariate plots, and CM pattern using size parameters, which distinctly point out a fluvial source for these clastics and that they later become redistributed along the beaches. The insights on the triangular plot using major elements inferred that the study area samples are predominantly graywacke to low-rank graywacke type. The Al2O3/SiO2 vs Fe2O3(tot) + MgO and K2O/Na2O-Fe2O3(tot) + MgO discriminant plots indicate a dual behaviour of the continental margin. The bivariate plot of SiO2 against Al2O3 + K2O + Na2O points out the existence of an arid climate. The petrographic type, fossiliferous calcareous feldspathic quartz arenite represents the sand-rich sequence of the Kundankulam Formation and the surface textural study of the quartz grains reveals the characteristics of beach environment.

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018258   Varma N K;Singh A K;Gupta M L (NO, , ) : In-situ measurement of thermal conductivity in underground coal mines. J Mines Metals Fuels 2001, 49(1-2), 19-25.

All the mathematical models for mine climate prediction are based on the numerical values of thermal properties of associated rock formations. Among them thermal conductivity is an important parameter and requires special attention. A simple method of in-situ measurement of thermal conductivity in coal mines is discussed. During experimentation 20 measurements were taken at number of locations in different collieries in different seams. Altogether 9 holes were drilled and used for underground experimentation. From these measurements average calculated values of in-situ effective thermal conductivity are presented.

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018257   Umamaheswar K;Basu H;Patnaik J K;Azam Ali M; Banerjee D C (Atomic Minerals Directorate for Exploration and Research, Department o, , Bangalore-560 072) : Uranium mineralisation in the mesoproterozoic quartzites of Cuddapah basin in Gandi area, Cuddapah district, Andhra Pradesh. A new exploration target for uranium. J Geol Soc India 2001, 57(5), 405-09.

Significant uranium occurrences are discovered recently for the first time in the Gulcheru quartzite of Papaghni group of Cuddapah Supergroup near Gandi, east of Papaghni river, Cuddapah District, A.P. Mineralisation is associated with an E-W fault. Friable whitish to light pink quartzite is the main host rock of uranium. Mineralisation occurs in the form of lensoidal bodies having dimensions of 20 - 200 m x 2 - 10 m in an E-W fault scarp section, over 2 km in length. Dip section is also mineralised. Samples have revealed anomalous concentrations of uranium, up to 1.441% U₃O₈ with negligible thorium. Concentration of Ni (<60>25 to 1033 ppm), Mo (<60>25 to 643 ppm), Pb (33 to 1515 ppm) and Cu(<60>25 to 170 ppm) points to the economic potentiality of the area. Petrological studies have identified uranium minerals such as pitchblende, uraninite and coffinite as fracture fillings and disseminations in the chlorite-sericite matrix of quartzite. The associated ore minerals are chalcopyrite, arsenopyrite, pyrite and limonite. These findings have important implications in the selection of new exploration targets for uranium in the basal beds of Cuddapah Supergroup unconformably overlying the fertile granitoid basement in the Eastern Dharwar Craton occurring in the southwestern part of Cuddapah basin.

018256   Tiwari T N;Nayak S (Department of Chemistry, Regional Engineering College, Rourkela-769 008) : Suitability of the ground water of Kakinada (Andhra Pradesh) for irrigation. Acta Cienc Indica-Chem 1998, 24(3), 91-4.

Data on the physico-chemical quality of ground water from 29 sampling sites of Kakinada in Andhra Pradesh have been analysed to investigate its suitability for irrigation. The analysis was done for two sampling periods, viz. October, 1994 and January, 1995, and the following 9 relevant parameters were studied for this purpose: pH, Conductivity, Total dissolved solids, Chloride, Sulphate, Sodium percentage, Sodium adsorption ratio, Osmotic pressure, and Kelly's index. Investigation shows that the ground water of Kakinada is generally suitable for irrigation except for the presence of higher levels of sodium at some sampling sites during October.

018255   Tiwari T N;Nayak S (Department of Chemistry, Regional Engineering College, Rourkela-769 008) : Water quality index for the ground water of Kakinada city in Andhra Pradesh (India). Acta Cienc Indica-Chem 1998, 24(3), 71-4.

Water quality index (WQI) has been calculated for the ground water of Kakinada - a port city in Andhra Pradesh (India) - for two sampling periods, viz., Oct., 1994 and Jan., 1995. This calculation was carried out for 29 sampling stations, using the data on 8 water quality parameters, viz., pH, Total dissolved solids, Total hardness, Calcium, Magnesium, Chloride, Sulphate, and Nitrate. The calculated WQIs vary from 24.7 (at the sampling station MSN Charties in Oct., 1994) to 386.4 (at the sampling station Turangi in Oct., 1994). The average values of WQI show that the quality of ground water in Kakinada is poorer in January (WQI = 167.7) compared to that in October (WQI = 151.4), when the pollutants are diluted following the rainy reason. This investigation shows that the ground water of Kakinada is fit for drinking without treatment (WQI ≤ 100) only at 11 sampling stations during October and 7 sampling stations during January.

018254   Tiwari S;Jassal G S (Geophysics Division, KDMIPE, ONGC Ltd., Dehra Dun) : Origin and evolution of the Garo-Rajmahal gap. J Geol Soc India 2001, 57(5), 389-403.

The Garo-Rajmahal gap represents a physiographic gap in the outcrop continuity of Satpura strike due to alluvial cover between Garo and Rajmahal hills. The major part of this gap lies in Bangladesh. It is the junction of continental foredeep basin (Ganga valley) in the north and the Bengal basin in the south. A major drainage system of Ganga and Brahmaputra rivers flows through this narrow region from the Himalaya to the Bay of Bengal. Earlier, many differing views have been put forward regarding its origin. The present paper has brought out the origin and evolutionary stages of the gap on the basis of integrated analysis of geological and geophysical data of India and Bangladesh. A crustal model for the gap area is also presented. It has been concluded that the gap had its embryonic origin during Permo-Carboniferous (Lower Gondwana) period and evolved through the geological time to its present form.

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018253   Tiwari R K;Rao K N N (Theoretical Geophysics Group, National Geophysical Research Institute, Uppal Road, Hyderabad-500 007) : Power law random behaviour and deterministic earthquake seasonality of northeast India. J Geol Soc India 2001, 57(4), 369-76.

Power Law function indicating the possible element of determinism on the time scale has been described. The existence of "roll off" towards higher rank-order, however, seems to indicate the transition in the nature of structure. In order to constrain these results, authors further compute the second order Kolmogorov-Sinai entropy (L₂), which reveals a coherent time structure with predictive time limit of about 12 to 16 months, indicating a quasi-deterministic dynamics that apparently is also evident (Power Law) in rank-order statistics. This predictive time limit seems to be too short to be associated with major global tectonics. Therefore, they propose an alternative possible physical mechanism, which may coexist with regional tectonics. In the light of present results, they suggest that surface/subsurface water infiltration into the main fractures and faults during a favourable season could increase the pore pressure thereby triggering frequent earthquakes, particularly in critically unstable tectonic regions.

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018252   Singh R S;Sharma K D;Faroda A S (NO, Central Arid Zone Research Institute, Jodhpur-342 003) : Climate change and its impact on drought and floods in Luni river basin of north-west arid India. J Agrometeorol 1999, 1(2), 99-111.

Luni river and its tributaries in the north-west arid India form integrated drainage basin of 34,866 km². Annual rainfall in the basin is highly variable, ranging from 600 mm in the southeast to 300 mm in the north-west, 85% of which is received during the months of June to September. Long-term fluctuations and trends in rainfall within and adjoining areas of Luni basin were studied for the period 1901-1996. The long-term monthly variation and trends in minimum, maximum and mean air temperatures of Jodhpur and Pali were also worked out to quantify possible changes on seasonal basis. In general, either apparent or significant increasing trends in air temperature as well as in rainfall were found at most of the places. Increasing (warming) trends in minimum temperature of May, June and August were found which was significant at 5 per cent level. However, in case of annual rainfall, increasing linear trend at eight locations (with a maximum rate of 1.6 mm year^-1 at Ajmer) and weak decreasing trend at four locations were observed during the study period. Mann-Kendall rank statistics revealed that this increasing trend rate in the annual rainfall at Ajmer is significant at 5 per cent level.

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018251   Singh R N;Thorpe R;Kristic D (Geological Survey of India, , Lohianagar, Patna-800 020) : Galena Pb isotope data of base metal occurrences in the Hesatu-Belbathan belt, eastern precambrian shield, Bihar. J Geol Soc India 2001, 57(6), 535-8.

Pb isotope data were obtained for galena specimens from 5 sulphide occurrences within the Chotanagpur Gneissic Complex (CGC) in eastern Bihar, where the host rock occurs as enclaves within the CGC. Based on galena Pb isotope composition, an attempt has been made to suggest a Proterozoic event of sulphide mineralization related to Precambrian crustal evolution. An age range 1650 to 1700 Ma seems reasonable for the Bihar galena.

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018250   Singh M P;Singh A K (Department of Geology, Banaras Hindu University, Varanasi-221 005) : Source rock characteristics and maturation of Palaeogene coals, northeast India. J Geol Soc India 2001, 57(4), 353-68.

Large number of coal samples from the Palaeogene coal deposits of Northeast India were subjected to detailed chemical (proximate, ultimate and Rock-Eval pyrolysis) and petrographic (maceral, microlithotype and vitrinite reflectance) analyses to examine their source rock characteristics and to explore their participation in hydrocarbon generation. The results show that these coals are sub-bituminous `C' to high volatile bituminous `C' in rank and have requisite petrographic characteristics to act as a potential source for the generation of significant amount of normal hydrocarbons. The values of vitrinite reflectance, particularly of the coals of Meghalaya and Assam, suggest a maturation close to the `top oil window' (birth line). This indicates the possibility of expulsion of oil and condensates in the basin. However, this contention needs to be supported by organic geochemical data, maturation modelling and time of hydrocarbon generation.

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018249   Shrivastava J P;Pattanayak S K;Singh C (Department of Geology, University of Delhi, Delhi-110 007) : Gold grains in Fe-rich tholeiitic lava flows from Amarkantak in the Eastern Deccan Volcanic Province India. J Geol Soc India 2001, 57(5), 455-8.

Disseminated microscopic gold grains, measuring 8-12 microns across and possessing a fineness of 950 to 960 have been observed in the quartz normative tholeiitic lava flows from the Amarkantak region of the Eastern Deccan Volcanic Province. High temperature of equilibration (1060-1470°C) and very low oxygen fugacity (<60>5) as determined from the co-existing ulvospinel-magnetite and ilmenite-haematite pairs are proposed to be the controlling factors for the occurrence of gold in these volcanics.

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018248   Sharma O P;Gupta K D;Tripathi P S M;Singh N N (Coal Survey Laboratory, , Canal Road, Jammu-180 001) : Mineral characterization of Mahagola coalfield of Jammu coal by X-ray diffraction. Proc Indian Sci Congr Ass - Pt III(YS abstr), Sect-I 1998, (NULL), 32(abstr).

Mineralogical studies of Jammu coal of Mahagola coalfield (viz-Mahagola mine) and its low temperature ash (L.T.A) have been carried out for characterisation of minerals, using X-ray diffraction technique. The X-ray studies established the presence of Kaolinite in major phase and quartz and mica in the minor phase in the Mahagola mine coal. The mineralogy has been discussed in the light of the geological factors. The utilization potential of Jammu coal of Mohagola coalfield (viz.-Mahagola mine) on the basis of its mineralogy is examined.

018247   Sharma M;Rawat T P S;Sharma Y C;Swarnkar B M; Singh J (Department of Atomic Energy, AMD, , New Delhi-110 066) : Sandstone-type uranium mineralisation in the early Tertiary sedimentary sequence in Tarol-Maltu area, Solan district, Himachal Pradesh. J Geol Soc India 2001, 57(5), 459-61.

Ground radiometric survey carried out in the early Tertiary Dagshai Kasauli Formations in the northwestern foothill Himalaya has led to the discovery of uranium mineralised sandstone bands extending for about 500 m, with 5-10 m width, at Tarol, 8 km southwest of Solan and 250 m, with 4-7 m width, at Maltu, 6.5 km southwest of Solan, in the Solan district of Himachal Pradesh. Grab samples from Tarol assayed up to 1.41% O₈, 1.65% U₃O₈ (β/γ) and <60>0.005% ThO₂ and Maltu assayed up to 0.24% eU₃O₈, 0.28% U₃O₈ (β/γ) and <60>0.005%ThO₂. In both the localities, majority of the samples show disequilibrium in favour of parent (uranium). Uraninite and uranophane are the main uranium minerals, which occur in close association with disseminated pellets of organic matter.

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018246   Shailendra Kumar;Chaki A;Bagchi A K (Department of Atomic Energy, Atomic Minerals Directorate for Exploration and Research, Jamshedpur-831 002) : Geochemistry of the granites from Jharsuguda district, Orissa : implications for rare metal mineralisation. J Geol Soc India 2001, 57(6), 539-44.

Jharsuguda Granite is intruded by several pegmatitic bodies, including rare metal bearing ones hosting columbite-tantalite and beryl. Geochemically, it is a silica-rich, metaluminous to peraluminous and potassium granite enriched in trace elements such as Rb, Nb, Zr, Y, Ga and Th, and depleted in Ba, Sr and Ti resulting in high Rb/Sr, Rb/Ba and Ga/Al ratios. The petromineralogical and geochemical characters indicate Jharsuguda Granite as an A-type, within plate granite (WPG), emplaced around 650°C-700°C at an assumed pressure of 5 kb. The granite characteristics similar to niobium-yttrium-fluorine (NYF) bearing, A-type fertile granites.

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018245   Sahu N K;Mukherjee M M (Geological Survey of India, , Nayapalli, Bhubaneswar-751 012) : Spinifex textured komatiite from Badampahar-Gorumahisani Schist belt, Mayurbjanj district, Orissa. J Geol Soc India 2001, 57(6), 529-34.

Spinifex Textured Peridotitic Komatiite (STPK) has been identified in the southern part of Badampahar Gorumahisani schist belt from the Mid-Archaean granite-greenstone sequence of Singhbhum-Orissa craton. Spectacular field outcrop of large tabular stacked plate olivine pseudomorphs with herringbone to haphazardly oriented book-like structure is located in Patharkata area (22°05'00"N:86°11'50"E). Petrographically, the STPK comprises olivine (completely altered to serpentine), tremolite, chlorite, talc, carbonate, magnetite and glass. Retention of primary skeletal texture, lack of metamorphic cleavage and largely pseudomorphous alteration pattern point to possible syn-eruptional hydration. Their major element chemistry conforms well with that of STPK of Barberton belt (3450 Ma) and reflects an Al-depleted signature. This volcanics-dominated curvilinear Badampahar-Gorumahisani belt has been intruded undoubtedly by the latest phase (3000 Ma) of Singhbhum granite (SBG) and possibly by a still earlier phase of SBG (3300 Ma). No data on lower age limit is available. Major element chemistry of the Archaean komatiites, occurring in the Badampahar Gorumahisani schist belt, suggests that they have been derived from mantle source and under extensional regime, erupted in a subaqueous (oceanic) environment.

018244   Saha A K;Mahapatra K C;Shome S;Bhoskar K G (Geological Survey of India, Project Economic Geology, , Operation: Nagpur-440 006) : Note on the first report of platinum incidence from auriferous quartz veins of Sakoli fold belt, Maharashtra. J Geol Soc India 2001, 57(5), 451-4.

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018243   Raza M;Safdar-E-Azam M;Shamim Khan m (Department of Geology, Aligarh Muslim University, Aligarh-202 002) : Geochemistry of mesoproterozoic mafic volcanics of Bayana Basin, North Delhi fold belt : constraints of mantle source and magmatic evolution. J Geol Soc India 2001, 57(6), 507-18.

Mesoproterozoic volcanism in Bayana basin in the northeastern part of Aravalli-Delhi fold belt consists of mafic lava flows with quartzite-conglomerate intercalations. The volcanics are tholeiites, characterized by enrichment of lage ion lithophile elements (LILE) and light rare earth elements (LREE) and depletion of Nb, P and Sr. The values of TiO2 (1.06 to 2.31%), Zr (50 to 182 ppm), Ti/Y (286 to 521), and Zr/Y (2.63 to 5.70) are low, which illustrate their close similarity with low-Ti continental flood basalts. The Bayana volcanics may have been derived from an enriched mantle source with no significant crustal contamination. The parental magma appears to have been derived from a subcontinental lithospheric mantle source with Fe/Mg ratio exceeding that of model pyrolite. It is suggested that the mantle source of these volcanics was enriched through metasomatism by progressive transport of mantle fluids and/or melts from deeper mantle. Olivine and clinopyroxene dominated the fractional crystallization and played a major role in the evolution of magma, following its derivation from shallow mantle source(s) where clinopyroxene occurred as a residual phase.

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018242   Rajasekhara Reddy D;Prasad V S S;Malathi V; Reddy K S N;Varma D D (Department of Geology, Andhra University, Visakhapatnam-530 003) : Economic potential of the heavy minerals of the beaches between Baruva and Bavanapadu, Andhra Pradesh. J Geol Soc India 2001, 57(5), 443-9.

Economic potentiality of the heavy minerals in the beaches between Baruva and Bavanapadu extending for about 45 km was examined. In the sub-surface sediments, the heavy minerals were studied at an interval of 1m up to a maximum depth of 5.8m. In general the concentration of heavy minerals is high in dunes followed by backshore and foreshore regions. Heavy mineral content increases from surface to sub-surface in dunes, decreases in foreshore and does not vary much in backshore. The heavy minerals include mainly ilmenite, garnet, sillimanite and ortho-pyroxenes with minor amounts of amphiboles, zircon, monazite, rutile etc. Majority of the heavies such as ilmenite, monazite, zircon etc. are concentrated in finer fractions while some of the heavies like garnet and sillimanite are concentrated in coarser fractions. The inferred reserves estimated for the area indicate its economical potential.

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018241   Peters J;Singh S K (NO, Keshava Deva Malaviya Institute of Petroleum Exploration, 9 Kaulagarh Road, Dehra Dun-248 195) : Satpura basin - an example of pre-rift, syn-rift and post-rift Gondwana sedimentation in India. J Geol Soc India 2001, 57(4), 309-20.

The evolution of the Satpura basin could be considered in terms of pre-rift, syn-rift and post-rift phases. The pre-rift phase is characterised by the development of sag in which sediments of the Talchir Formation were uniformly deposited. Sediments deposited in prograding fluvial and paludal environments, representing the Barakar Formation followed this. Tectonic readjustments related to initial break up of the Gondwanal and resulted in the development of a rift system in which remaining sediments of the Barakar Formation and entire Motur and Bijori Formations were deposited in a "Venetian blind" pattern due to progressive subsidence, rapid sedimentation and northward shift of depocentres caused by a northward migration of the rift. These pre-rift and syn-rift phases were initiated in the Early Permian and culminated in Latest Permian. The post-rift phase, which was initiated in the Late Lower Triassic, witnessed the deposition of sediments of Pachmarhi and Matkuli Formations. Subsequent to the Jurassic hiatus, sediments of Jabalpur Formation were deposited overlapping the older sediments. Deposition of Infra-trappean sediments was the last episode of the post-rift phase. These are essentially calcretes formed on the peneplained surfaces of the older Gondwana sediments.

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018240   Patel S C;Behera S;Mohanty A;Singh A K;Patel S K (Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai-400 076) : Metamorphic history of sapphirine- and relict-kyanite-bearing Mg-Al rich rocks at Hatimunda hill near Junagarh, Kalahandi district, Orissa. J Geol Soc India 2001, 57(5), 417-27.

Cordierite-phlogopite dominated Mg-Al rich rocks occur as small enclaves at the Hatimunda hill near Junagarh in the Orissa sector of the Eastern Ghats belt. Peak mineral assemblages in these rocks included phlogopite, bronzite, kyanite (now relict) and quartz/corundum. Sapphirine typically occurs as corona around corundum or in clusters along with corundum. The sapphirine is slightly more aluminous than the MgO:Al₂O₃:SiO₂ ratio of 7:9:3. Textural criteria and phase analysis in the model system MAS indicate the following reactions: Opx + Sil + Qtz = Crd; Opx + Sil = Crd + Crn; and Opx + Crn = Spr + Crd. A qualitative petrogenetic grid shows that these reactions may be crossed in sequence along a decompressional P-T trajectory. The rocks preserve textural evidence of formation of sapphirine, at least in part, from phlogopite and sillimanite. P-T conditions for peak metamorphism were 700-800°C and <62>8 kbar based on the stability field of mineral assemblages. Texturally, early kyanite and late sillimanite indicate that the decompression is possibly part of a clockwise P-T path. This interpretation is supported by the occurrence of Mg-rich garnet (X_pip = 0.47) in the amphibole-dominated Mg-Al rich schist of the neighbouring Jilindara area.

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018239   Parthasarathy G;Sharma S R (NO, National Geophysical Research Institute, Hyderabad-500 007) : Comparative study on structural properties of graphites from Dharwar craton, India: a high-temperature DTA study. J Geol Soc India 2001, 57(5), 435-42.

Reports here new experimental results on the high temperature differential thermal analyses (DTA) on six graphite samples from the Dharwar craton, along with the structural data obtained by powder X-ray diffraction, carbon isotopic and Laser Raman spectrospcopic studies. Degree of metamorphism and crystallite size obtained by X-ray studies indicates systematic variation in graphite with peak metamorphic temperatures. X-ray and Laser Raman spectroscopic studies do not show the presence of rhombohedral graphite phase which is the most characteristic of the fluid-deposited (abiogenic) graphite. The most reliable information on the origin of the graphite is provided by the carbon isotopic ratio. However, the interpretation of the isotopic data is usually not straightforward because other processes may influence the original signature. But isotopic fractionation does not alter once the graphite is well crystallized, because of very sluggish kinetics of carbon diffusion. Present studies show that the main exothermic DTA peak temperature of graphite samples decreases linearly with increase of the interplanar d-spacing d (002) of the hexagonal graphite structure and follows the relation d₀₀₂ (Angstrom) = 3.5197-1.67 X 10^-4 T (K). These studies also reveal that DTA/thermogravimetric analysis is an effective tool for distinction of detrital graphite material from the poorly crystallized organic matter.

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018238   Pandian M S;Varma O P (Department of Earth Sciences, Pondicherry University, Pondicherry-605 014) : Geology and geochemistry of topaz granite and associated wolframite deposit at Degana, Rajasthan. J Geol Soc India 2001, 57(4), 297-307.

Post-Delhi acid magmatism at Degana has yielded three intrusive bodies of topaz granite, the earliest one emplaced within phyllite of Delhi Supergroup and the other two successively in the core of previous intrusive, along with two generations of aplites. Wolframite mineralisation has occurred at two different stages during the magmatism: greisen-bordered vein-type ore bodies hosted by the earliest granite intrusive and adjoining phyllite represent the first stage; and (2)stockwork ore bodies hosted by an intrusion breccia developed at a later stage following the emplacement of other two granite bodies. Presence of topaz, Li-mica and fluorite is a characteristic feature of these granites and wolframite deposits. The granites are strongly peraluminous and geochemically specialised with enrichment of Li, F, Rb and depleted in Sr, K-Ar dating of zinnwaldite from wolframite bearing lode indicates an age of 860±25 Ma.

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018237   Pandey V;Shekh A M;Parmar R S (Department of Agricultural Meteorology, Gujarat Agricultural University, Anand-388 110) : Occurrence of droughts and floods over Gujarat. J Agrometeorol 1999, 1(2), 177-82.

Daily rainfall data for ninety years (1901-1990) of all the districts of the state of Gujarat have been analysed to work out the occurrence of drought and floods in the state. Results revealed that about 91-97% of annual rainfall was received in the four months (June to September), out of which July contributes the maximum. The arid region receives rainfall of 500 mm or less in most of the years while humid regions receive more than 1000 mm. However, the droughts and floods are observed in both the regions.

018236   Pandey S K;Singh A K;Hasnain S I (NO, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi-110 067) : Hydrochemical characteristics of meltwater draining from Pindari Glacier, Kumaon Himalaya. J Geol Soc India 2001, 57(6), 519-27.

A detailed geochemical study of the Pindari glacier meltwaters has been carried out to assess the major ion chemistry and solute acquisition processes at high altitude. Electrical conductivity of the meltwater ranges from 69 to 207 μS cm^-1. Analytical result shows that bicarbonate and sulphate are sub-equally dominant anions, accounting for 49% and 50% of the total anions respectively in equivalent unit. In equivalent unit, calcium is found to be the most dominating cation (74%) followed by magnesium (20%), potassium (3.5%) and sodium (2.5%). Ca-SO4-HCO3 is the dominating hydrochemical facies in Pindari glacier meltwater. High contribution of calcium and magnesium to the total cations (90-95%), high (Ca-Mg)/HCO3 and (Ca+Mg)/(Na+K) ratio indicate that the composition of meltwater draining from Pindari glacier is largely controlled by carbonate weathering and partly by silicate weathering. High concentration of sulphate and average C-ratio (HCO3/HCO3+SO4) value of 0.49 suggests that coupled reactions, involving carbonate dissolution and protons derived primarily though not exclusively from the oxidation of sulphide minerals, largely control bulk meltwater composition. Low concentrations of dissolved ions were observed in the early ablation (May and July) seasons, while the late ablation seasons (September and October).

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018235   Pandey O P;Agrawal P K (NO, National Geophysical Research Institute, Uppal Road, Hyderabad-500 007) : Nature of lithospheric deformation beneath the western continental margin of India. J Geol Soc India 2001, 57(6), 497-505.

Nature of lithospheric mantle deformation beneath the continental regions is a problem that has attracted global attention. It is being questioned whether the continental segments have remained the same at deeper levels since their evolution or whether recent tectonic and geodynamic events have deformed them. In the present work, authors study the lithospheric thermal structure beneath the elongated, anomalous, seismically active and rifted western continental margin of India and its surroundings. The study, based on the hitherto known evolutionary history of the Indian subcontinent, suggests that the lithospheric mantle beneath this part of the Indian peninsula has been considerably sheared, deformed and weakened due to mainly late Cretaceous - early Tertiary catastrophic and geodynamic events apart from Proterozoic thermal reactivations. Beneath this region, the asthenosphere has upwarped to a depth as shallow as 38 to 80 km due to rise of isotherms caused by subcrustal melting. The study further reveals that the segments situated north of latitude 16°N are much warmer with shallow Moho depths than those situated south of it.

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018234   Pandey D K;Fursich F T (Department of Geology, University of Rajasthan, Jaipur-302 004) : Environmental distribution of scleractinian corals in the Jurassic of Kachchh, Western India. J Geol Soc India 2001, 57(6), 479-95.

Scleractinian corals commonly occur at specific horizons and localities, in carbonate and in siliciclastic sediments, throughout the Jurassic (Bajocian to Oxfordian) of Kachchh as meadows, biostromes, boulder beds and as scattered specimens. In many cases they are part of the autochthonous benthic fauna and in others they suffered short intra-basinal transport. Cerioid forms of low diversity (Amphiastraea, Isastraea, etc.) abound in high-energy siliciclastic sediments. High diversity coral faunas, which include thamnasteroid (Microsolena, Dimorpharaea and Kobya) and solitary (Trocharaea and Trochoplegma) taxa with fenestrate septa and plocoid forms (Stylina), dominate in carbonate sediments deposited in low energy, deeper-water environments. The solitary Montlivaltia exhibits a great physiological tolerance of environmental stress. In all, eight coral assemblages have been recognized with the Early Bajocian to Late Callovian sediments of the Kachchh basin.

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018233   Nallapa Reddy A;Yadagiri K (NO, Oil and Natural Gas Corporation Ltd, No. 3, First lane, N.H. Road, Chennai-600 034) : Benthic foraminifera and clay mineralogy across the cretaceous-tertiary boundary in Cauvery basin, India. J Geol Soc India 2001, 57(4), 339-51.

Two relatively uninterrupted sequences spanning the Cretaceous-Tertiary boundary (KTB) are present at two sites, namely Ammapettai-A (AMT-A) in Thanjavur sub-basin and Anandathandavapuram-A (ATP-A) in Ariyalur-Pondicherry sub-basin in Southern India. A total of 28 benthic foraminiferal species were identified at the generic or specific level. The occurrence of Nuttallides truempyi, Gavelinella beccariiformis, Bulimina trinitatensis and agglutinated foraminifera across KTB suggests that the paleobathymetry was <62> 500m, and that deep sea benthic foraminifera were not severely affected by the KTB event. However, changes in foraminiferal relative abundances and their morphotypes were noticed across KTB and were related to changes in supply of organic fluxes to the basin floor. The clay mineral assemblages across KTB at the two sites appear to be little different. The high abundance of kaolinite clay close to the KTB at site AMT-A, may be attributed to progradational or shifting of depositional pattern.

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018232   Nageswar Rao P;Prakhar Kumar;Srivastava S K; Sinha R M (Department of Atomic Energy, Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad-500 016) : Uranium mineralisation in Kurnool sub-basin, Cuddapah basin, Andhra Pradesh. J Geol Soc India 2001, 57(5), 462-3.

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018231   Nagar S G;Seetaramayya P;Singh S S (NO, Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Road, Pashan, Pune-411 008) : Computation of global solar radiation over monsoon trough region in summer (May to July). J Agrometeorol 1999, 1(2), 125-36.

Attenuation coefficients a1 and a2 are evaluated using 15 years daily hourly global solar radiation data for May, June and July for 9 stations in the northwest and cental India in the southwest monsoon trough region. These coefficients determine the attenuation of the global solar radiation due to the water vapor and dust. The spatial distribution of a1 revealed a decreasing tendency from south to north and west to east with the advance of southwest monsoon. The coefficient a1 reduced considerably in the month of July with the establishment of monsoon over the country. The estimated values of global solar radiation are compared with the observed values and it is found that they match each other resonably. The root mean square error was 5-10% in May, 10-20% in June and 15-22% in July. The instantaneous global solar radiation for any station within the monsoon trough region can be computed with sufficient accuracy for fair weather conditions, using the areal mean values of a1 and a2 with the empirical equation suggested in this study which establishes a relationship between the global solar radiation and the sine of the solar elevation angle (q) within an average rmse of 15-20%.

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018230   Nag S;Gaur R K;Pal T (Geological Survey of India, , Lucknow) : Late cretaceous-tertiary sediments and associated faults in southern Meghalaya plateau of India vis-a-vis south Tibet: their interrelationships and regional implications. J Geol Soc India 2001, 57(4), 327-38.

Late Cretaceous-Tertiary sediments together with the underlying Sylhet Trap and Precambrian granites/gneisses are exposed along the southern fringe of Meghalaya plateau. This huge pile of sediments is dissected by E-W and NNE-SSW striking faults. Several workers postulated a direct correlation between tectonism and sedimentation, interpreting the E-W striking Dauki fault as a `growth fault'. The present work suggests that the sedimentation of this pile is controlled by basin transgression and regression and not by the Dauki or other faults. Dauki fault being post-Kopili (post-Eocene) in age, could not have acted as a growth fault during the deposition of these Late Cretaceous-Palaeogene sediments. In the plate tectonic version of Greater India in Gondwanaland, a broadly coeval lithofacies and biofacies assemblages existed in Late Cretaceous-Palaeogene sequences of the southern Tibetan plateau and southern Meghalaya plateau. While the sedimentation in Tibet during Palaeogene is dominated by carbonate rocks - except at the K/T boundary (Jidula Formation), the sedimentation in southern Meghalaya is represented by arenaceous and calcareous rocks.

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018229   Manimaran G;Sivasubramanian P;Senthiappan M (Department of Geology, V.O. Chidambaram College, Tuticorin-628 008) : Rock melt extrusion at Abishekapatti, Tirunelveli district, Tamil Nadu. J Geol Soc India 2001, 57(5), 464-6.

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018228   Mallick K;Vasanthi A (NO, National Geophysical Research Institute, Uppal Road, Hyderabad-500 007) : Delineation of subsurface extent of Perinthatta anorthosite, Kerala, India. J Geol Soc India 2001, 57(4), 321-6.

Bouguer gravity anomalies of the Perinthatta anorthosite in north Kerala on the west coast of India are reprocessed by a new finite element space-domain technique in order to delineate the sub-surface extent of the anorthosite body. The residual gravity contour map and corresponding colour image brought out the configuration of the anorthosite body very clearly.

018227   Kawatkar S G;Manoli P S (Department of Chemistry, Shivaji University, Kolhapur-461 004) : Res-acetophenone guanylhydrazone - a new analytical reagent for ruthenium (III). Acta Cienc Indica-Chem 1998, 24(3), 109-10.

New analytical reagent for the determination of Ruthenium(III) by using res-acetophenone guanylhydrazone (RAG) is reported. Complete synthesis of RAG has been given in brief. Absorption spectra of the reagent and the complex are discussed. An absorption maxima occurs at 375 nm for Ru(III)-RAG complex. Variation of pH indicates that the measurements can be done at pH 1.5. The molar extinction coefficient and Sandell's sensitivity are 0.7469 x 10⁴ lit. mole^-1 cm^-1 and 0.04124 μg/cm² respectively. The nature of the complex has been studied by Job's method and mole ratio method. Under specified conditions, Ru(III) and RAG form 1:1 complex. The Beer's law is valid upto 35.0 ppm. The instability constant is 1.934 x 10^-6. The method is applied in synthetic mixtures for the determination of ruthenium.

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018226   Jacob D S;Uphade B K;Aher H R;Zinjad D G; Gunjal P S;Kuchekar S R (P.G. Department of Analytical Chemistry, P.V.P. College, Pravaranagar, At/Po. Loni, Tal. Shrirampur, Dist. Ahmedanagar) : Studies on ground water quality in Pravara area Ahmedanagar district. II. Proc Indian Sci Congr Ass - Pt III(YS abstr), Sect-I 1998, (NULL), 16(abstr).

Study of ground water quality in Pravara at command area where molasses are used as fertiliser continuously has been carried out. The analytical results have been evaluated for physico-chemical parameters such as colour, odour, pH, hardness, TDS, chloride, sulphate, potassium, calcium, DO, COD, BOD and electrical conductivity. The results show that total solid, chloride, sulphate and COD are higher in level while some of the samples are coloured.

018225   De C (Geological Survey of India, , 15, Kyd Street, Kolkata-700 016) : Marine influence in the Indian Gondwana basins: a review from ichnological findings. J Geol Soc India 2001, 57(5), 411-15.

Ichnological findings from the Indian Gondwana basins provide a new insight into the role played by the ancient sea in shaping Upper Palaeozoic-Mesozoic geohistory. The ichnocoenoses with high density and diversity define typical shallow marine inchnozones and ichnofacies (Skolithos and Cruziana) recurring as thin tongues within continental deposits and, at times, clearly separating coal-bearing cyclic deposits. In the same way, as documented in other Gondwana fragments, these ichnofacies tongues in conjunction with complementary marine invertebrate body fossils, unquestionably suggest strong infaunal activities and short-lived shallow marine incursions, the most conspicuous of which are noted within the Talchir and Barakar Formations. They also split the coal seams into transgressive-regressive couplets, a very common feature of shallow marine lower deltaic (paralic) deposits.

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018224   Bhaskar B P;Anantwar S G;Challa O;Bharambhe P R;Velayutham M (National Bureau of Soil Survey and Land Use Planning (ICAR), Regional, , Amravati Road, Nagpur-440 010) : Catenary variations in properties of shrink-swell soils in minor 4 of Jayakwadi Irrigation Project in Parbhani district, Maharashtra. J Geol Soc India 2001, 57(5), 429-34.

A shrink-swell soil sequence developed over Cretaceous-Eocene age basaltic catena was examined for understanding the influence of local relief on morphological, physical and chemical characteristics of soil. The morphology of these clay soils occurring on microhighs and microlows of catena shows that the Vertic haplustepts on summits have dark grey to brown matrix with subangular to angular blocky aggregates having pressure faces on ped surfaces. There was successive increase in the thickness of Cambic and slickensided horizons in subgroups of Vertisol on the middle and foot slopes having yellowish grey matrix with depth, and of angular blocky structural aggregates with hard and firm consistency when dry. The Fe and Mn concretions in Bss1 and Bss2 horizons of Chromic Haplusterts (P3) and Typic Haplusterts (P4) have indicated periodic oxidation and reduction leading to successive mobilisation and precipitation of Fe and Mn as oxides of small nodules along slickensides. The particle size for soils of summits and middle slopes was `fine' but for soils on foot slopes, the particle size was `very fine' at family level. These soils are slightly to strongly alkaline with increasing trends of carbonates and decreasing trends of organic carbon content. Exchangeable Ca to Mg ratio decreased with the profile depth and landscape position.

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018223   Abani K;Shekh A M ;Patel H R;Patel C T (Department of Agricultural Metereology, Gujarat Agricultural University, Anand Campus, Anand-388 110) : Estimation of sunshine hours by harmonic analysis. J Agrometeorol 1999, 1(1), 33-6.

Fourier series was utilized for the estimation of monthly sunshine hours based on the mean monthly measured sunshine hours. The mean monthly measured sunshine hours data of 34 years, from 1958 to 1994 at Anand has been used in the present study. Fourier series was developed by taking different harmonics i.e., 3rd to 6th harmonic. Estimates thus obtained revealed that the results obtained with the third harmonic are in good agreement with measured monthly sunshine hours. The differences between measured and estimated sunshine hours were found statistically non-significant.

017091   Sen S K;Bhattacharya S (Department of Geological Sciences, Jadavpur University, Calcutta) : Diverse signatures of deformation, pressure-temperature and anatexis in the Rayagada sector of the Eastern Ghats granulite terrane. Proc Indian Acad Sci-Earth Planet Sci 2000, 109(3), 347-69.

Granulites and granitoids around Rayagada in the north central part of the Eastern Ghats belt display structural and petrological differences when compared to similar rocks from Chilka and Jenapore in the northern Eastern Ghats. The impress of F₁ deformation is almost erased while that of F₃ is muted. The metapelites have a restricted chemical range and are non-migmatitic. There are two varieties of leptynitic granitoids, one of which is interlayered with yet another S-type granite containing cordierite. The maximum recorded temperature from geothermometers is 780°C, but the magnitude of pressure is comparatively low, the highest value being 6.3 kbar. Another distinctie feature of the pressure-temperature record is the absence of evidence of decompression in the lower realms of the pressure and temperature. Metamorphic reactions that could be identified indicate cooling, a noteworthy reaction being the sillimanite to andalusite transformation. Integration of data from pressure-temperature sensors suggest cooling at two pressures, 6 and 5 kbar. The generation of two types of granitoids from metapelites is interpreted to be due to intersection with solidus curves for pelitic and graywacke-like compositions, constrained by recent experiments, at 6 and 5 kbar. The first melting occurred on a prograde path while the second one was due to increase in temperature during exhumation at tectonic rates.

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017090   Sarkar J (NO, Indian Meteorological Department, Pune-411 005) : Agricultural drought of 1987 monsoon season in India. J Agrometeorol 2000, 2(1), 55-60.

Using Thornthwaite's technique weekly water balance has been computed for a selected network of stations in India for the monsoon season of the drought year 1987 beginning from June to the end of September utilizing potential evapotranspiration values obtained by Penman's method. Above normal value of weekly aridity index has been taken as the agricultural drought index to demarcate the drought affected areas. Results showed that a major portion of the Gujarat state had continuously been under the grip of moderate to severe drought conditions since 18-24 June till September end. Other areas substantially affected were Rajasthan, Punjab, Haryana, Coastal Andhra Pradesh, Madhya Pradesh, Uttar Pradesh and Vidarbha where prolonged drought spell abating only for short periods prevailed in the season.

017089   Patel N R;Mandal U K;Pande L M (NO, Indian Institute of Remote Sensing, Dehradun) : Agro-ecological zoning system - a remote sensing and GIS perspective. J Agrometeorol 2000, 2(1), 1-13.

Agro-ecological Zoning (AEZ) through remote sensing is an alternative to delineate areas having similar agro-climatic and agro-edaphic conditions for better assessing crop yield potentialities. This AEZ concept involves the representation of land in layers of spatial information and their combination using Geographical Information System (GIS). A GIS based model for agro-ecological zoning was developed and optimal land use is suggested for a watershed in Uttar Pradesh, India measuring 50 thousand hectares area.

017088   Harikumar P;Rajaram M;Balakrishnan T S (NO, Indian Institute of Geomagnetism, Colaba, Mumbai-400 005) : Aeromagnetic study of peninsular India. Proc Indian Acad Sci-Earth Planet Sci 2000, 109(3), 381-91.

Degree sheet Aeromagnetic maps up to 17°N, acquired from the Geological Survery of India, have been manually redigitised at 6 minute intervals to study the long wavelength anomalies over peninsular India. These data have been collected at different survey altitude, epochs, flight line directions, etc. Great care has been taken to correct the total field map and remove the contribution due to the core field and prepare an accurate crustal anomaly map. For the first time, a regional map, depicting the NW-SE structural features north of the orthopyroxene isograd with the essentially E-W features to the south of it and revealing several well known structures, is presented. The analytical signal is calculated to delineate the source fields of these anomalies. It dramatically maps the charnockites and is able to delineate the orthopyroxene isograd. In the Dharwar region the magnetic signatures are associated with the intrusives/iron ore bodies. Source rocks of the aeromagnetic anomalies are the host province of charnockites in the SGT and the intrusives/iron ore bodies in the Dharwar belt. Gravity residuals are calculated and a tectonic map of the region is presented from the combined geopotential data.

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017087   Chakraborty A;Upadhyaya H C;Sharma O P (Centre for Atmospheric Sciences, Indian Institute of Technology, New Delhi-110 016) : Response of an ocean general circulation model to wind and thermodynamic forcings. Proc Indian Acad Sci-Earth Planet Sci 2000, 109(3), 329-37.

Stretched-coordinate ocean general circulation model has been designed to study the observed variability due to wind and thermodynamic forcings. The model domain extends from 60°N to 60°S and cyclically continuous in the longitudinal direction. The horizontal resolution is 5° x 5° and 9 discrete vertical levels. First a spin-up experiment has been done with ECMWF-AMIP 1979 January mean fields. The wind stress, ambient atmospheric temperature, evaporation and precipitation have been used in order to derive mechanical and thermodynamical surface forcings. Next, the experiment has been extended for another 30 years (3 cycles each of 10 year period) with varying surface boundary conditions (from January 1970 to December 1988 of ECMWF-AMIP monthly fields for each cycle) along with 120 years extended spin-up control run's results as initial conditions. The results presented here are for the last 10 years simulations. The preliminary results of this experiment show that the model is capable of simulating some of the general features and the pattern of interannual variability of the ocean.

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017086   Baorong H;Huyuan S;Jinglei Z;Gongyu G;Jinming S (NO, Institute of Oceanology, Chinese Academy of Sciences, Qingdao-266 071, P.R. China) : Analysis of corrosive environmental factors of seabed sediment. Bull Mater Sci 2001, 24(2), 253-5.

The corrosivity of seabed sediment at spots at different distances from seashore was studied based on in situ investigations in the northern sea area of the Yellow River mouth. The results show that there is close relation between distance from seashore and corrosivity of seabed sediment.

016045   Subba Rao K S;Allam M M;Robinson R G (Department of Civil Engineering, Indian Institute of Science, Bangalore-560 012) : Study on Burland's β. Indian Geotech J 2000, 30(2), 92-107.

Influence of roughness of the interface and the over-consolidation ratio of Burland's β is reported in this paper based on the modified direct shear test results on three fine grained soils and five solid surfaces of different roughness. An empirical correlation between the friction angle and roughness has been obtained for the evaluation of friction angle under drained condition. Burland's β strongly depends on the roughness of the interface and the overconsolidation of the soil. The need to account for the roughness of the interface in estimating the shear resistance is brought out.

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