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High Incidence of Scandium and REY in the Garnets from Coastal Sands of India
Mineralization
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High Incidence of Scandium and REY in the Garnets from Coastal Sands of India
Mineralization
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Barren volcano is the only active Neogene arc volcano in Andaman Sea, are the product of subduction, where Indian plate is subducting beneath the overriding South East Asian plate. About sixty potentially active volcanoes lie along the SE Asian volcanic rim including Barren...
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Barren volcano is the only active Neogene arc volcano in Andaman Sea, is the product of subduction, where Indian plate is subducting beneath the overriding South East Asian plate. About sixty potentially active volcanoes lie along the SE Asian volcanic rim including Barren (Shanker et. al. 2001). Barren Volcano covering 10 sq km sub-aerial area and is located 135 Km NE of Port Blair in Andaman Sea...
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The study of the coastal plain between Mukkam and Tuni in A.P. was taken up under the International Geosphere Biosphere Programme in order to identify and establish the past sea levels if any and also delineate zones of neotectonic activity. Previously the area under reference was mapped and landforms were delineated. The present study gives an impetus exclusively for recording evidences of past sea levels and neotectonic activity. Keeping this objective in view a five (5) km wide coastal plain along the present shoreline between Mukkam and Tuni was thoroughly studied.
Seismotectonics
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Garo Hills District exposes rock types ranging in age from Archaean to Quaternary. The northern and south western part of the Garo Hills exposed with Basement Gneissic Complex comprising metasedimentaries, high grade gneisses, migmatites, amphibolites etc. intruded by acid and basic intrusives. A small occurrence of Gondwana rocks represented by conglomerate, pebble bed, gritty sandstone, shale and carbonaceous shale horizons is found in the western border of Garo Hills which extends below the alluvial plains of Assam
Stratigraphy
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Singrimari coalfield is located in Dhubri District of Assam at the Meghalaya-Assam border and lies close to Indo-Bangladesh border. Lower Gondwana rocks are exposed to the south-east of the coalfield, around Hallidayganj (Singrimari) village located at the western tip of the Garo Hills, Meghalaya. The strata to the north western part are dipping below a cover of alluvium brought by Brahmaputra River. These Lower Gondwana sequences have earlier been classified into Talchir and Karharbari Formation on the basis of lithological characteristics.
Stratigraphy
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Mafic microgranular enclaves (MME) commonly occur in alkali granite, monzogranite, granodiorite or granitoids (Vernon, 1983; Didier, 1984) reported as field evidence for magma mixing and mingling by several authors. Moreover textures like rapakivi, anti-rapakivi, quartz ocelli, acicular and mixed apatite morphologies, inclusion zones in feldspars, anorthite spikes in plagioclase, sphene ocelli, k-feldspar megacrysts in MME, sieved plagioclase and poikilitic textures are interpreted as textural evidences of magma mixing and mingling...
Stratigraphy
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Fluvial systems play a significant role in the evolution of landforms in response to tectonics and climate. They predominantly act as the carriers of continental mass (solids and chemical compounds in solution) to the ocean, thus playing major role in global geochemical cycles. Therefore, study of river systems holds the key to understanding the mechanism of linkage between tectonics and climate. Fluvial records of the Indian sub-continent represent a unique continuum of climato-tectonic processes consequential to variations in climate, sea level and Himalayan tectonics...
Stratigraphy
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In the Western Dharwar craton (WDC), chromiferous, layered, ultramafic sequences occur as narrow (500m) dismembered bands, confined mainly to a >250 km long belt extending from Nanjangud, Mysore district, in the south, to Hanumalpura, Davanagere district, in the north. Although the status of these bodies is still conjectural, because of their close association with effusive spinifex textured peridotitic komatiite (STPK), they have been assigned as Archaean greenstone type deformed ultramafic sequences. These narrow ultramafic bodies are confined mainly to the older supracrustal belts (Sargur Group) or occur independently as enclaves within the granite gneiss (PGC).
Mineralization
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