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Co-Authors
- Tapan Pal
- Sujit Chakraborty
- M. N. Praveen
- H. S. Shrivastava
- M. L. Dora
- L. D. Gaikwad
- John Mahoney
- Jyotisankar Ray
- Namita Chakma
- Sarmistha Mukhopadhyay
- Basab Chattopadhyay
- Shyamal Sengupta
- Subrata Mukhopadhyay
- Mrinal Mandal
- Debasis Ghosh
- Sandip Some
- Animesh Thakur
- Thungyani N. Ovung
- Xueming Teng
- Madhuparna Paul
- Proloy Ganguly
- Saradee Sengupta
- Supriyo Das
- Arindam Guha
- Sukanya Chaudhury
- Komal Rani
- K. Vinod Kumar
- Tuhin Chatterjee
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Ghosh, Biswajit
- Petrogenesis of Archaean Chromite Deposits of the Roro-Jojohatu Areas in the Singhbhum Craton: A Boninitic Parental Melt in Supra-Subduction Zone Setting
Abstract Views :173 |
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Authors
Affiliations
1 Petrology Division, ER, Geological Survey of India, Kolkata, IN
2 Project: Andaman and Nicobar, Op: WSA, ER, Geological Survey of India, Kolkata, IN
3 Monitoring Division, CHQ, Geological Survey of India, Kolkata, IN
1 Petrology Division, ER, Geological Survey of India, Kolkata, IN
2 Project: Andaman and Nicobar, Op: WSA, ER, Geological Survey of India, Kolkata, IN
3 Monitoring Division, CHQ, Geological Survey of India, Kolkata, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No Spl Iss 5 (2008), Pagination: 635-647Abstract
The chromite bearing ultramafic rocks of Roro-Jojohatu areas in the Singhbhum Craton within the metasediments of the Iron Ore Group (IOG) is a part of Archaean greenstone terrain of Eastern India. In this area since all the primary silicates are altered, chromite has been used for host rock petrogenesis. Chromite occurs in different forms viz. (a) mainly cumulus phases in chromitite layers, (b) intercumulus phases forming banded/net textured chromite and (c) fine disseminations. Chemically all the chromites are aluminian chromite. The massive chromite and banded/net-textured chromites show high Cr-number (79-83) and intermediate Mg-number (51-60), but disseminated chromites have consistently low Cr-number (76-79) and low Mg-number (43-52). The plots of TiO2 versus Cr-number, Al2O3 versus TiO2, and Mg-number versus Cr-number reflect boninitic parental melt for the chromites. Al2O3 contents in liquid ranging from 9.67-11.03wt% and TiO2 contents in liquid 0.42-0.75wt% also correspond for boninitic parentage. The FeO/MgO ratio in liquid ranging from 1.15 to 1.29 for massive chromites and 0.86-1.23 for banded/net-textured chromite, also suggest for boninitic source. Al2O3 versus TiO2 plots indicate that chromites plot in the field of supra-subduction zone peridotites. Boninitic magma was produced from hydrous mantle melting in supra-subduction zone. At supra-subduction setting an oxidizing hydrous fluid derived from subducting slab facilitated the formation of chromitite layers at high fO2 conditions.Keywords
Chromites, Boninite, Supra-Subduction Zone, Roro-Jojohatu, Singhbhum Craton.- Sulphide Mineralisation in Betul Belt: Classification and General Characteristics
Abstract Views :196 |
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Authors
Affiliations
1 Geological Survey of India, E-5 Arera Colony, Bhopal - 462 016, IN
2 Geological Survey of India, Seminary Hills, Nagpur - 440 006, IN
1 Geological Survey of India, E-5 Arera Colony, Bhopal - 462 016, IN
2 Geological Survey of India, Seminary Hills, Nagpur - 440 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 1 (2007), Pagination: 85-91Abstract
Sulphide mineralisation and syn-Volcanic hydrothermal alteration in the Betul Belt is associated with submarine bimodal volcanism. Felsic volcaniclastics form the favourable host rocks in most areas. Alteration zones have been metamorphosed to middle to upper-Amphibolite facies giving rise to various metamorphic mineral assemblages. Based on metal ratios, mineralisation can be classified into Zn-Cu and Zn-Pb-Cu types. The difference between the two types might be related to the composition of the footwall volcanics. Zn-Cu types are in close proximity to mafic volcanics towards their footwall side whereas, Zn-Pb-Cu types occur in areas dominated by felsic volcanics with little mafic volcanics towards the footwall. The sub-Parallel sheet like nature of the ore bodies and strata-Bound alteration might be related to the permeable nature of the host volcaniclastics.Keywords
Sulphide Mineralisation, Classification, Hydrothermal Alteration, Subsea-Floor Replacement, Betul Belt, Central India.- Multiple Origins of Gahnite Associated with Hydrothermal Alteration from the Bhuyari Base Metal Prospect of Proterqzoic Betul Belt, Madhya Pradesh
Abstract Views :181 |
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Authors
Affiliations
1 Geological Survey of India, E-5 Arera Colony, Bhopal-462 016, IN
1 Geological Survey of India, E-5 Arera Colony, Bhopal-462 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 2 (2007), Pagination: 233-241Abstract
Multiple origin of gahnite of different generations and their relationship with other coexisting minerals like garnet, biotite, chlorite and sphalerite were studied in metamorphosed synvolcanic hydrothemally altered rock associated with base metal mineralisation from the Proterozoic Bhuyari prospect, Betul Belt, Central India. The present assemblages appear to be the result of overprinting of arnphibolite grade metamorphism on primary hydrothermal alteration products. Gahnite is found in a quartz + biotite + muscovite + pLagioclase + gahnite + garnet + chlorite assemblage. Petrographic evidence with supporting mineral composition data suggests the presence of two generations of gahnite. The first generation gahni te is found surrounding sphalerite grains and may be the product of desulphidation of primary sphalerite involving first generation garnet. Second generation gahnite show petrographic evidence of transformation from biotite and might be the result of overstepping of the zinc saturation limit of biotite during alteration to chlorite. The Bhuyari area was subjected to one prograde event followed by a retrograde metamorphic event and mineral paragenesis is in conformity with the metamorphic hlstory.Keywords
Gahnite, Zn-Pb-Cu deposit, Hydrothermal alteration, Betul Belt, Madhya Pradesh.- Mayodia Ophiolites of Arunachal Pradesh, Northeastern Himalaya
Abstract Views :190 |
PDF Views:2
Authors
Affiliations
1 Geological Survey of India, Op WB-SK-AN, ER, Kolkata - 462 016, IN
2 Department of Geology and Geophysics, University of Hawaii, SOEST, 1680 East-West Road, Honolulu, HI96822, US
3 Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
1 Geological Survey of India, Op WB-SK-AN, ER, Kolkata - 462 016, IN
2 Department of Geology and Geophysics, University of Hawaii, SOEST, 1680 East-West Road, Honolulu, HI96822, US
3 Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 4 (2007), Pagination: 595-604Abstract
The ophiolite assemblage around Mayodia, Dibang Valley, Arunachal Pradesh falls in the eastern extension of the Indus suture belt and is represented by peridotite tectonite hornblendite (dyke) and amphibolite. The entire succession is overlain by metabasalt carapace interlayered with metapelitic pelagic sedimentary rocks. The basal peridotite may be classified as wehrlite. The hornblendite typically occurs as intrusive within the peridotite tectonite and is represented by cumulus primary amphibole. The amphibolite is characterized by well developed gneissose banding. The pillow lava is represented by actinolite-Chlorite-Albite-Epidote schist. The evolutionary trend of the ophiolite suite has been assessed based on major, trace and rare earth element data which favours partial melting of a depleted mantle source. Tectonic discrimination diagrams for the amphibolite and metabasalt clearly indicate their MORB affinity. Such ophiolite assemblage has developed as a result of collision of India and Asia that started with the closing of Tethyan ocean during Mesozoic and Early Tertiary.Keywords
Mayodia Ophiolite, Petrology, Geochemistry, Tectonic Setting, Northeastern Himalaya, Arunachal Pradesh.- Gahnite Chemistry from Metamorphosed Zn-Pb-Cu Sulphide Occurrences of Betul Belt, Central India
Abstract Views :164 |
PDF Views:134
Authors
Affiliations
1 Geological Survey of India, E-5 Arera Colony, Bhopal - 462 016
2 Geological Survey of India, E-5 Arera Colony, Bhopal - 462 016, IN
1 Geological Survey of India, E-5 Arera Colony, Bhopal - 462 016
2 Geological Survey of India, E-5 Arera Colony, Bhopal - 462 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 1 (2006), Pagination: 17-20Abstract
Gahnite Chemistry from metamorphosed Zn-Pb-Cu sulphide occurrences of Betul Belt, Central India has been presented here. Gahnites of this Belt are suggested to be a product of desulphidation of sphalerite during metamorphism. Although the very presence of zincian spinels in rocks may appear to constitute an exploration guide for metamorphosed massive sulphide (MMS) deposits, spinels that are likely to be spatially associated with sulphides appear to have characteristic Zn-rich, Mg-poor compositions.Keywords
Gahnite Chemistry, Zn-Pb-Cu-Deposits, Genetic Implications, Betul Belt, Central India.- Impacts of Rice Intensification System on Two C. D. Blocks of Barddhaman District, West Bengal
Abstract Views :239 |
PDF Views:89
Authors
Affiliations
1 Khorad Amena High School, Satgachia, Barddhaman 713 422, IN
2 Department of Geography, The University of Burdwan, Barddhaman 713 104, IN
1 Khorad Amena High School, Satgachia, Barddhaman 713 422, IN
2 Department of Geography, The University of Burdwan, Barddhaman 713 104, IN
Source
Current Science, Vol 109, No 2 (2015), Pagination: 342-346Abstract
Rice is an important cereal crop of West Bengal and in many of the Indian states. There is a compelling need to increase rice productivity vertically in West Bengal due to less availability of land and greater dependency of the population on the productivity of the land. For this reason, the economic and ecological potentiality of the system of rice intensification (SRI) has been evaluated by several researchers. In the present study, Monteswar and Memari-II C. D. blocks of Barddhaman district, West Bengal have been selected to analyse the impacts of SRI on economic and ecological aspects of rice-growing. Results show that benefit-cost (B : C) ratio in SRI practice is significantly higher than the conventional method of rice cultivation. Under SRI B : C ratio varies from 5.06 : 1 to 3 : 1, but in the conventional method it varies from 2.18 : 1 to 1.78 : 1. Therefore, SRI farmers are experiencing multiple benefits in terms of both economics and ecology.Keywords
Agro-Ecology, Benefit–Cost Ratio, Economic and Ecological Potentiality, System of Rice Intensification.- Significance of Mineral Chemistry of Syenites and Associated Rocks of Elagiri Complex, Southern Granulite Terrane of the Indian Shield
Abstract Views :220 |
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Authors
Sarmistha Mukhopadhyay
1,
Jyotisankar Ray
1,
Basab Chattopadhyay
2,
Shyamal Sengupta
2,
Biswajit Ghosh
1,
Subrata Mukhopadhyay
1
Affiliations
1 Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
2 Geological Survey of India, Central Petrological Laboratories, 15 A&B Kyd Street, Kolkata - 700 016, IN
1 Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
2 Geological Survey of India, Central Petrological Laboratories, 15 A&B Kyd Street, Kolkata - 700 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 2 (2011), Pagination: 113-129Abstract
The Elagiri complex (12°31' N: 78°35' E) represents one of the important silica - oversaturated syenite plutons of the Southern Granulite Terrane of the Indian shield. This article for the first time reports the mineral chemistry of the Elagiri complex and brings out important petrogenetic significance. The litho-members of Elagiri complex are intrusive into high grade country rocks viz. granite gneiss, amphibolite and pyroxene granulite. The country rocks are foliated bearing evidences of multiple folding and deformation. On the other hand, the constituent litho members of the Elagiri complex (syenites, gabbro and later intrusives marked by lamprophyre and carbonatite) show preservation of igneous layering in terms of discernible parallelism of the constituent minerals. The Elagiri complex shows presence of sharp contacts among litho members and marked absence of chilled facies peripheral to the margin. Electron microprobe data have been critically used to systematize the constituent mineral-phases of the different lithomembers of the complex. Geothermobarometric data indicate a temperature of equilibration in the range of ∼700° to 500° C at ∼2.0 to 5.2 kb which corresponds to shallow level (cf. 18.2 km) equilibration-depth of the complex. Field observations and mineral chemistry data suggest that liquid immiscibility plays an important role during the evolution of the Elagiri complex.Keywords
Mineral Chemistry, Pyroxene Thermometry, Equilibration Depth, Liquid Immiscibility, Elagiri Complex, Indian Shield.- Environmental Impact of Sand Mining: a Case Study along the Lower Reaches of Ajay River, West Bengal, India
Abstract Views :347 |
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Authors
Affiliations
1 Department of Geography, Sidho-Kanho-Birsha University, Purulia, West Bengal, IN
2 Department of Geography, University of Calcutta, West Bengal, IN
3 Department of Geography, Barabazar Bikram Tudu Memorial College, Purulia, West Bengal, IN
1 Department of Geography, Sidho-Kanho-Birsha University, Purulia, West Bengal, IN
2 Department of Geography, University of Calcutta, West Bengal, IN
3 Department of Geography, Barabazar Bikram Tudu Memorial College, Purulia, West Bengal, IN
Source
Journal of Environment and Sociobiology, Vol 13, No 1 (2016), Pagination: 99-108Abstract
Indiscriminate and unscientific sand mining has become a serious environmental threat to the river systems and its surrounding environment. The rapid rate of urbanization has increased the demand for sand, which is supplied from river bed through sand mining. Sand mining from river bed results in channel degradation and erosion, change in local gradient, head cutting, increased turbidity, bank erosion and sedimentation of riffle areas and ruins its flow regimes and total sedimentary environment. In lower reaches of Ajay river, unscientific sand mining is a serious issue from Illambajar (Birbhum) to Mongalkot (Burdwan) fluvial environment of Ajay river basin, which is highly affected by in-stream sand mining. Natural morphological characteristics of Ajay river are changed and damaged due to over mining of sand. Excessive in-stream sand mining is a threat to Illambajar bridge and Nutanhut bridge. River embankments are also affected by river bed mining. Sand mining also affects the adjoining groundwater system. In Mongalkot and Ketugram Blocks (Burdwan), ground water level becomes lower than the past. Sand mining also generates extra vehicle traffic, which negatively impairs the environment and pollution level continuously gets higher. Total station survey was carried out to detect the changes in river bed. Topographical sheets and satellite images were geocoded to extract past status of river health and tried to correlate with the present situation. GPS (Handheld-Germin etrexH-20) was used as necessary tool in the present study. The main objective of the present study is to evaluate the impact of sand mining on riparian environment.Keywords
Sand Mining, Sedimentation, Head Cutting, Embankments, Organism.References
- Bhattacharya, A. K. 2009. Channel patterns, depositional behaviour and sediment composition of a tropical river, Northeast India: A study from source to sink. Unpublished Progress Report, Jakarta, Indonesia.
- Bhattacharya, A. K. 1972. A study of the Ajay river sediments. In : The Bhagirathi-Hooghly-Basin (ed. Bagchi. K.) Proc. Interdisciltrinury Symp: 18-32.
- Chakraborty, A. 2009. Suffering with the river: Floods, social transition and local. Unpublished Progress Report.
- Gupta, A. 2011. Tropical Geomorphology. Cambridge University Press, Cambridge: 102-287.
- Padmalal, D. 2008. Effect on river sand mining: A case from the river catchment of Vemband lake, South East Coast of India. Environmental Geology, Springer, 54: 879-889.
- Petrogenesis of Zincian Spinel from Mamandur Base Metal Sulphide Prospect, Tamil Nadu
Abstract Views :150 |
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Authors
Affiliations
1 Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata – 700 019, IN
1 Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata – 700 019, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 4 (2011), Pagination: 365-369Abstract
Zincian spinels (gahnites) from the Mamandur Zn-Pb-Cu prospect of the Southern Granulite Terrain have been studied. Gahnites in the quartzofeldspathic gneiss occur either as (a) porphyroblastic grains closely in association with cordierite and sphalerite or as (b) inclusions in poikiloblastic quartz grains, restricted within quartz veinlets. Compositionally these gahnites belong to two different clusters corresponding to two modes of occurrences. The origin of the porphyroblastic gahnites is linked with the process of desulphidation of sphalerite whereas those occurring as inclusions within poikiloblastic quartz are direct crystallisation products from silica rich hydrothermal solution. A new compositional field for this latter group of gahnites is proposed here.Keywords
Gahnite, Cordierite, Desulphidation, Mamandur, Base Metal.References
- ATKIN, B.P. (1978) Hercynite as a breakdown product of staurolite from within the aureole of Ardara Pluton. Co. Donegal, Fire. Min. Mag., v.42, pp.237-239.
- CHATTOPADHYAY, P.K. (1999) Zn-spinel in the metamorphosed Zn- Pb-Cu sulphide deposit at Mamandur, Southern India. Min. Mag., v.63, pp.743-755.
- COLLINS, A.S., CLARK, C., SAJEEV, K., SANTOSH, M., KELSEY, D.E. and HAND, M. (2007) Passage through India: the Mozambique Ocean suture, high-pressure granulites and the Palghat- Cauvery shear zone system. Terra Nova, v.19, pp.141-147.
- DIETVORST, E.J.L. (1980) Biotite breakdown and the formation of gahnite in metapelitic rocks from Kemio, Southwest Finland. Contrib. Mineral. Petrol., v.75, pp.327-337.
- GANDHI, S.M. (1971) On the ferroan gahnite of Mamandur, Madras State, India. Min. Mag., v.3, pp.528-529.
- GHOSH, B., PRAVEEN, M.N. and SHRIVASTAVA, H.S. (2006) Gahnite Chemistry from Metamorphosed Zn-Pb-Cu Sulphide Occurrences of Betul Belt, Central India. Jour. Geol. Soc. India, v.67, pp.17-20.
- GHOSH, B. and PRAVEEN, M.N. (2007) Garnet-Gahnite-Staurolite relations and occurrence of Ecandrewsite from the Koparpani base metal sulfide prospect, Betul Belt, Central India. Neu. Jahrb. Mineral. Abhand., v.184, pp.105-116.
- HARRIS, N.B.W., SANTOSH, M. and TAYLOR, P.N. (1994) Crustal evolution in South India: constraints from Nd isotopes. Jour. Geol., v.102, pp.139-150.
- HEIMANN, A., SPRY, P.G. and TEALE, G.S. (2005) Zincian spinel associated with metamorphosed Proterozoic base-metal sulphide occurrences, Colorado: A re-evaluation of gahnite composition as a guide in exploration. Can. Min., v.43, pp.601- 622.
- HICKS, J.A., MOORE, J.M. and REID, A.M. (1985) The co-occurrence of green and blue gahnite in the Namaqualand metamorphic complex, South Africa. Can. Min., v.23, pp.535-542.
- PRAVEEN, M.N. and GHOSH, B. (2007) Multiple origins of gahnite associated with hydrothermal alteration from the Bhuyari base metal prospect of Proterozoic Betul Belt, Central India. Jour. Geol. Soc. India, v.69, pp.233-241.
- RAMAKRISHNAN, M. (1993) Tectonic evolution of the granulite terrains of Southern India. Mem. Geol. Soc. India, no.25, pp.35-44.
- SANGSTER, D.F. and SCOTT, S.D. (1976) Precambrian massive Cu- Zn-Pb sulphide ores of North America. In: K.H. Wolf (Ed.), Handbook of strata-bound and stratiform ore deposits: Amsterdam, Elsevier, v.6, pp.129-222.
- SEGNIT, E.R. (1961) Petrology of the zinc lode, New Broken Hill Consilated Ltd., Broken Hill. Aust. Inst. Mining Metall. Proc., v.199, pp.87-112.
- SPRY, P.G. (1987) The chemistry and origin of zincian spinel associated with the Aggeneys Cu-Pb-Zn-Ag deposits, Namaqualand, South Africa. Mineral. Deposit, v.22, pp.262- 268.
- SPRY, P.G. and SCOTT, S.D. (1986) The stability of zincian spinels in sulphide systems and their potential as exploration guides for metamorphosed massive sulphide deposits. Econ. Geol., v.81, pp.1446-1463.
- STODDARD, E.F. (1979) Zinc-rich hercynite in high grade metamorphic rocks: a product of the dehydration of staurolite. Amer. Miner., v.64, pp.736-741.
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- Spatial Analysis of Healthcare Facility: A Block Level Study in Purulia District, West Bengal
Abstract Views :131 |
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Authors
Source
International Journal of Innovative Research and Development, Vol 4, No 9 (2015), Pagination:Abstract
The study basically deals with five basic indicators namely: Healthcare Institution Population Ratio (HCIPR), Doctor Bed Ratio (DBR), Bed Population Ratio (BPR), Doctor Healthcare Institution Ratio (DHCIR) and Bed Healthcare Institution Ratio (BHCIR) to explore the status of healthcare facility (HCF) of the Purulia district. We have collected secondary database from District Statistical Handbook, Purulia, 2012.The Healthcare Facility Index (HCFI) has been computed to understand the status of HCF of the district. The study reveals that Purulia-I block enjoys the best HCF among the all blocks. The majority of the blocks have lagged behind from the Purulia-I on the basis of HCF.
Keywords
HCIPR, DPR, BPR, DHCIR and BHCIR- Mineralogy of the Manipur Ophiolite Belt, North East India:Implications for Mid-Oceanic Ridge and Supra-Subduction Zone Origin
Abstract Views :236 |
PDF Views:92
Authors
Thungyani N. Ovung
1,
Jyotisankar Ray
1,
Xueming Teng
2,
Biswajit Ghosh
1,
Madhuparna Paul
1,
Proloy Ganguly
1,
Saradee Sengupta
1,
Supriyo Das
1
Affiliations
1 Department of Geology, Calcutta University, 35 B.C. Road, Kolkata 700 019, IN
2 School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, CN
1 Department of Geology, Calcutta University, 35 B.C. Road, Kolkata 700 019, IN
2 School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, CN
Source
Current Science, Vol 112, No 10 (2017), Pagination: 2122-2129Abstract
Mineralogical studies on the mantle and crustal sections of the Manipur Ophiolite Belt (MOB) lead to important findings pertaining to its genesis and controlling tectonic milieu. The wide compositional gap in the Cr# and Mg# content of spinel in the mantle peridotites of MOB implies upper mantle melting in two different tectonic settings. The tectonic discrimination diagrams based on spinel chemistry indicate a midoceanic ridge (MOR) origin for the high-Al spinel peridotites and a supra-subduction zone origin for the high-Cr spinel peridotites. The pyroxenite mantle dyke, ultramafic cumulate and pillow-basalt record temperature in the range of 600-1030°C, 600-800°C and 700-1005°C respectively. Plotting of clinopyroxene composition of pillow-basalt in the TiO2-Na2O-SiO2/100 (wt%) tectonic discrimination diagram, implies a subduction-related origin of the basalts. Experimental studies on the serpentine stability indicate that it was dominantly affected by high temperature-low deformation setting.Keywords
Mineralogical Study, Ophiolite Belt, Pyroxenite Mantle Dyke, Pyroxene Thermometry.References
- Acharyya, S. K., Collisional emplacement history of the NagaAndaman ophiolites and the position of the eastern Indian suture. J. Asian Earth Sci., 2007, 29, 229–242.
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- Singh, A. K., High-Al chromian spinel in ultramafic rocks of Manipur Ophiolite Complex, Indo-Myanmar Orogenic Belt: implication for petrogenesis and geotectonic setting. Curr. Sci., 2009, 96(7), 973–978.
- Devi, L. D. and Singh, I., Geochemical study of peridotites from the Manipur Ophiolite Complex, Northeast India with special reference to their PGE concentration. J. Geol. Soc. India, 2011, 77, 273–279.
- Ningthoujam, P. S., Dubey, C. S., Guillot, S., Fagio, A. S. and Shukla, D. P., Origin and serpentinization of ultramafic rocks of Manipur Ophiolite Complex in the Indo-Myanmar subduction zone, Northeast India. J. Asian Earth Sci., 2012, 50, 128–140.
- Singh, A. K., Singh, I., Devi, L. D. and Singh, R. K. B., Geochemistry of Mid-Ocean ridge Mafic intrusive from the Manipur Ophiolitic Complex, Indo-Myanmar Orogenic Belt, NE India. J. Geol. Soc. India, 2012, 80, 231–240.
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- Ghosh, B., Ray, J. and Morishita, T., Grain-scale plastic deformation of chromite from podiform chromitite of the Naga–Manipur Ophiolite belt, India: implication to mantle dynamics. Ore Geol. Rev., 2014, 56, 199–208.
- Pal, T., Bhattarcharya, A., Nagendran, G., Yanthan, N. M., Singh, R. and Raghumani, N., Petrogenesis of chromites from the Manipur belt, NE India: evidence for a supra-subduction zone setting prior to Indo-Myanmar collision. Mineral. Petrol., 2014, 108, 713–726.
- Khogenkumar, S., Singh, A. K., Singh, R. K. B., Khanna, P. P., Singh, N. I. and Singh, W. I., Coexistence of MORB and OIB-type mafic volcanics in the Manipur Ophiolite Complex, IndoMyanmar Orogenic Belt, Northeast India: Implication for heterogeneous mantle source at the spreading zone. J. Asian Earth Sci., 2016, 116, 42–58.
- Gansser, A., The significance of the Himalayan suture zone in the alpine Himalayan Region (eds Tater, J. M.), Tectonophysics, 1980, 62, 37–52.
- Mitchell, A. H. G., Phanerozoic plate boundaries in mainland SE Asia, the Himalayas and Tibet. J. Geol. Soc. London, 1981, 138, 109–122.
- Acharyya, S. K., Ray, K. K. and Roy, D. K., Tectono-stratigraphy and emplacement history of the ophiolite assemblage from the Naga Hills and Andaman Island arc India. J. Geol. Soc. India, 1989, 33, 4–18.
- Ghose, N. C., Agarwal, O. P. and Singh, R. N., Geochemistry of the ophiolite belt of Nagaland, N.E. India. In Ophiolite and Indian Plate Margin (eds Ghose, N. C. and Varadarajan, S.), Sumna Publ., Patna, 1986, pp. 241–293.
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- Spectral Response of Few Important Textural Variants of Chromitite and its Potential in Estimating Relative Grades of Chromitite – A Case Study for Chromitite of Nuggihalli Schist Belt, India
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Authors
Affiliations
1 Geosciences Group, National Remote Sensing Centre, Indian Space Research Organization, Balanagar, Hyderabad 500 625, IN
2 Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, IN
1 Geosciences Group, National Remote Sensing Centre, Indian Space Research Organization, Balanagar, Hyderabad 500 625, IN
2 Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, IN
Source
Current Science, Vol 114, No 08 (2018), Pagination: 1721-1731Abstract
We have collected, processed and analysed the reflectance spectra of representative chromitite samples of spot type, clot type and disseminated type textural variants to understand the diagnostic spectral features of each of these samples. We have found that the reflectance spectrum of each textural variant is distinct from the spectra of other variants despite having few common absorption features. Spectral features of chromitite samples are governed by the spectra of two dominant minerals, chromite and chlorite. Spectral features of chromitite at 550 nm and 1100 nm are governed by electronic transition process in Fe3+ and crystal field effect in Fe2+ ions present in chromite structure respectively. On the other hand, spectral features at 1400 nm, 1900 nm and 2300 nm are related to the vibration of O–H, H–OH and metal hydroxide bonds in chlorite. Amongst these features, the spectral feature at 1100 nm (due to Fe2+ in chromite grains) is common to all three major textural varieties of chromitite samples studied here. Electron probe micro analysis (EPMA) data of chromite and chlorite grains of each texture are used to relate the presence and abundance of Fe2+ (in chromite grains) with absorption feature. Width of the 1100 nm feature has a correlation value 0.95, while depth of the same feature has a correlation value 0.94 with the abundance of chromite mineral estimated using modal analysis of chromite samples. Therefore, spectrometric parameter of 1100 nm spectral feature of chromitite can be used as proxy for estimating modal abundance of chromite in chromitite samples after estimating deposit specific correlation coefficient.Keywords
Chromitite, Electronic Processes, Modal Analysis, Spectral Feature, Texture, Vibrational Processes.References
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- Application of the Ecological Footprint Method for Measuring Sustainability of Agricultural Land use at a Micro Level in Barddhaman District, West Bengal, India
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Authors
Affiliations
1 Khorad Amena High School, Satgachia, Purba Barddhaman 713 422, IN
2 Department of Geography, The University of Burdwan, Purba Barddhaman 713 104, IN
1 Khorad Amena High School, Satgachia, Purba Barddhaman 713 422, IN
2 Department of Geography, The University of Burdwan, Purba Barddhaman 713 104, IN
Source
Current Science, Vol 115, No 10 (2018), Pagination: 1913-1920Abstract
In the present study we used the ecological footprint method to numerically measure the sustainability of agricultural production at the micro level. For this, two community development blocks of Barddhaman district, West Bengal, India were selected. As a consumption- based method, it is most suitable for measuring cropland footprint, biocapacity of croplands, and their ecological surplus and deficit status of an environmental indicator. The integrated result represents higher sustainability of agricultural system, but crop-wise assessment explores some negative aspects with respect to self-sufficiency of the study area that demand necessary transformation of existing cropping pattern.Keywords
Agricultural Land Use, Biocapacity, Ecological Footprint, Sustainability.References
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- Micropropagation in Medicinal Plants: A Review
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Authors
Affiliations
1 Plant Bio-technology Laboratory, Post Graduate Department of Botany, Ramakrishna Mission Vivekananda Centenary College, Rahara, Kolkata-700 118, West Bengal, IN
1 Plant Bio-technology Laboratory, Post Graduate Department of Botany, Ramakrishna Mission Vivekananda Centenary College, Rahara, Kolkata-700 118, West Bengal, IN