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Shome, S.
- Depositional Environment and Basin Development During Early Palaeogene Lignite Deposition, Western Kutch, Gujarat
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Authors
Affiliations
1 Geological Survey of India, Stratigraphy Division, CHQ, Calcutta-700 016, IN
2 Geological Survey of India, Coal Division, Calcutta-700 016, IN
1 Geological Survey of India, Stratigraphy Division, CHQ, Calcutta-700 016, IN
2 Geological Survey of India, Coal Division, Calcutta-700 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 47, No 5 (1996), Pagination: 579-592Abstract
Exploration for lignite by drilling in the early Tertiary Supratrappean paralic sequence on the onshore of western Kutch,Gujarat, provides detailed information on the basement characteristics and palaeoenvironment of lignite deposits. A comprehensive study of outcrop sequence and its dip directional subcrop counterpart reveal that lignite bearing sediments were deposited in three distinct domains; (a) fringe areas of exposed trap rock on mainland, (b) adjacent dip directional subsurface areas on trap basement and (c) areas located beyond the subcrop limit of trap in a basinward direction. Domain (b) is considered most favourable locale for exploration as it contains palaeotopographic lows. A synthesis of outcrop and suberop data helped in identifying three depositional environments for the lignite bearing sediments, namely a prograding delta, back barrier environment and lagoons of foraminiferal bank environments. Vegetation growth and accumulation took place in all the three environments but sizable peat matter are found to occur in transitional lower delta plain, and in the back barrier deposits. These depositional environments and various stratigraphic criteria are used to reconstruct six conceptual models to depict the evolution of early Tertiary basin and accumulation of lignite therein. The significance of stratigraphic markers i.e. Lower Eocene Assilina marl-moll usca coquina bed and the Middle Eocene large Nummulities bed, in locating lignite deposits is also discussed.Keywords
Lignite Sedimentation, Palaeogene, Kutch, Gujarat.- Incidence of Gold in Subgreenschist to Greenschist Facies Metabasalt of Bhowali, Nainital District, Uttaranchal
Abstract Views :199 |
PDF Views:155
Authors
Affiliations
1 Geological Survey of India, Kolkata, IN
2 Geological Survey of India, Lucknow, IN
1 Geological Survey of India, Kolkata, IN
2 Geological Survey of India, Lucknow, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 4 (2002), Pagination: 379-383Abstract
Mesoproterozoic metavolcano-sedimentary sequence in and around Bhowali-Khairna area, Uttaranchal, constitute mostly metabasalts with quartzites, phyllites and variegated slates, referable to Bhimtal Formation. Our study was centred on metabasalts and the rocks occurring in close spatial association with them. Detailed petro-mineralogical and SEM-EDS studies have revealecl the presence of gold which we report here for the first time. Of the two types of metabasalts viz., massive, crudely foliated type and foliated type, both showing mineralogical assemblages of subgreenschist facies and greenschist facies respectively, gold is commonly found in the foliated type and rarely in the massive type. Presence of gold as tiny grains in disseminated fashion suggest that widespread hydrothermal activity caused precipitation of gold after the rocks had witnessed peak metamorphism.- A Note on the First Report of Platinum Incidence from Auriferous Quartz Veins of Sakoli Fold Belt, Maharashtra
Abstract Views :216 |
PDF Views:204
Authors
Affiliations
1 Geological Survey of India, Maharashtra, Nagpur - 440006, IN
2 Geological Survey of India, Central Palaeontological Laboratory, Kolkata - 700016, IN
1 Geological Survey of India, Maharashtra, Nagpur - 440006, IN
2 Geological Survey of India, Central Palaeontological Laboratory, Kolkata - 700016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 57, No 5 (2001), Pagination: 451-454Abstract
No Abstract.- Arsenic Rich Phases in Aquifer Sediments from Southern West Bengal
Abstract Views :184 |
PDF Views:178
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.- Association of Microbes with Arsenic-Bearing Siderite Concretions from Shallow Aquifer Sediments of Bengal Delta and its Implication
Abstract Views :200 |
PDF Views:133
Authors
Affiliations
1 Geological Survey of India, Kolkata - 700 016, IN
1 Geological Survey of India, Kolkata - 700 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 3 (2001), Pagination: 269-271Abstract
No Abstract.- Arsenic Rich Phases in Aquifer Sediments Prom Southern West Bengal
Abstract Views :181 |
PDF Views:140
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.- Alaskan-Type Mafic–Ultramafic Complex at Padhar, Betul Belt, Central India
Abstract Views :267 |
PDF Views:89
Authors
Affiliations
1 Geological Survey of India, Central Region, Nagpur 440 006, IN
2 Geological Survey of India, Southern Region, Hyderabad 500 068, IN
3 Geological Survey of India, National Center of Excellence in Geoscience Research, Kolkata 700 016, IN
4 Geological Survey of India, National Center of Excellence in Geoscience Research, Bengaluru 560 078, IN
1 Geological Survey of India, Central Region, Nagpur 440 006, IN
2 Geological Survey of India, Southern Region, Hyderabad 500 068, IN
3 Geological Survey of India, National Center of Excellence in Geoscience Research, Kolkata 700 016, IN
4 Geological Survey of India, National Center of Excellence in Geoscience Research, Bengaluru 560 078, IN
Source
Current Science, Vol 114, No 03 (2018), Pagination: 671-678Abstract
We report here an Alaskan-type mafic–ultramafic complex at Padhar from the Precambrian Betul Belt of Central India. The Padhar intrusive bodies show lithological zoning defined by olivine-bearing ultramafic rocks in the core and gabbroic rocks at the margins, and are commonly accompanied by Cr–Cu–Ni sulphide mineralization. Mineral chemistry and whole-rock geochemistry of these rocks indicate that they are derived from the crystallization of hydrous magmas. The Padhar complex is characterized by high Mg and low abundance of incompatible trace elements. Flat REE pattern with negative Nb anomaly suggests arcmagmatism typical of Ural–Alaskan type. Presence of Mg-rich clinopyroxene and hornblende-rich rock types in the Padhar mafic–ultramafic intrusives along with paucity of orthopyroxenes in them further distinguish its from different types of complexes, i.e. ophiolite, Alpine and stratiform layered-type. These features are akin to Alaskan-type rocks as seen in Alaska, Canada and Urals of Russia. This finding of Alaskan-type ultramafic complex in the Padhar area of Betul Belt, Madhya Pradesh, is significant and has important implications in the tectonics and geodynamics of the Central Indian Tectonic Zone in general, and in the search of platinum group of minerals in particular.Keywords
CITZ, Mafic–Ultramafic Complex, Hydrous Magmas, Intrusive Bodies, Lithological Zoning.References
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