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Pal, Taraknath
- Evidence for Pre-Grenvillian High-Pressure Granulite Metamorphism from the Northern Margin of the Sausar Mobile Belt in Central India
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Authors
Affiliations
1 Regional Petrology Laboratory, Geological Survey of India, Central Region, Nagpur - 440 006, IN
2 EPMA Laboratory, Geological Survey of India, Faridabad - 121 001, IN
1 Regional Petrology Laboratory, Geological Survey of India, Central Region, Nagpur - 440 006, IN
2 EPMA Laboratory, Geological Survey of India, Faridabad - 121 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 53, No 4 (1999), Pagination: 385-399Abstract
Distinct lithological associations, structural relationships, and petrographic and geothemobarometric results indicate the presence of reworked granulites of Pre-Grenvillian age from the northern margin of the Sausar mobile belt (SMB) in Central India. In rare residual zones, the mafic granulite-felsic migmatite gneiss association preserves early structures and high-P (∼ 10.5 kbar at ∼ 775°C) granulite histories which appear to pre-date and bear no relation to ∼ 1000 Ma old Sausar orogeny. An isothermal decompression through ∼ 5.5 kbar at 750°C from maximum recorded P-T condition, possibly signifies extensional collapse of the crust, previously thickened through collision. During the Sausar orogeny, the granulites were further tectonically interleaved with younger lithological associations. Widespread retrogression in amphibolite and finally in greenschist facies conditions have all but obliterated granulite mineralogy and structure except in rare low-strain domain.Keywords
Metamorphic Petrology, Granulites, High-P Metamorphism, Sausar Mobile Belt, Central India.
- Ilmenites from Cox's Bazar Beach Sands, Bangladesh : Their Intergrowths
Abstract Views :169 |
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Authors
Affiliations
1 Department of Geological Sciences, Jadavpur University, Calcutta - 700 032, IN
1 Department of Geological Sciences, Jadavpur University, Calcutta - 700 032, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 40, No 1 (1992), Pagination: 29-41Abstract
About 52% of the samples of Cox's Bazar beach contain six textural types of hematite-ilmenite exsolutions,the commonest (∼83%) being the seriate type. Hemo-ilmenite with greater ilmenite contnet exsolves in a process of continuous exsolution mechanism, whereas more hematiterich phases (very common) exsolve discontinuously. The hemo-ilmenites (IIm45 Hem55 to IIm75 Hem25) are ferrimagnetic in nature. Modal analysis has indicated the percentages of pure ilmenite (exsolved + unexsolved type) and hematite (exsolved, both host and guest) to be 73.74% and 26.26% respectively. This result also corroborates with X-ray, Mossbauer and chemical analyses.Keywords
Cox's Bazar Beach Sand, Bangladesh, Exsolution Textures, Mossbauer Spectroscopy, X - ray Diffraction, Petrography.- Arsenic Rich Phases in Aquifer Sediments from Southern West Bengal
Abstract Views :173 |
PDF Views:172
Authors
Affiliations
1 Central Petrological Laboratory, Geological Survey of India, 15, Kyd Street, Kolkata 70001 6, IN
1 Central Petrological Laboratory, Geological Survey of India, 15, Kyd Street, Kolkata 70001 6, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 2 (2001), Pagination: 173-176Abstract
No Abstract.Full Text
- Arsenic Rich Phases in Aquifer Sediments Prom Southern West Bengal
Abstract Views :175 |
PDF Views:134
Authors
Affiliations
1 Publication Division, Geological Survey of India, Eastern Region, Kolkata, IN
2 Central Petrological Laboratory, Geological Survey of India, 15 Kyd Street, Kolkata - 700 016, IN
1 Publication Division, Geological Survey of India, Eastern Region, Kolkata, IN
2 Central Petrological Laboratory, Geological Survey of India, 15 Kyd Street, Kolkata - 700 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 6 (2001), Pagination: 552-553Abstract
No Abstract.Full Text