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1High Incidence of Scandium and REE in the Garnets from Coastal Sands of India
Mineralization
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2The preliminary offshore seabed mapping from 1985 till 2012 has indicated promising occurrences of placer bearing sands in the territorial waters off Odisha. The geological mapping and heavy mineral studies have established the occurrence of multi mineral placers within 6 to 55m isobaths in the continental shelf of the Odisha coast. The placer minerals occur as thin lenticular patches parallel to the coast. The survey delineated an elongated heavy mineral (HM) bearing block from Sonapurapeta in the south to Chilka in the north covering an area of about 600 sq. km (Fig.1). The concentration of the HM varies from 0.5 to 17 wt % in the top one-meter sediments often extends up to 2m depths.
Mineralization
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3Barren 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...
Natural Hazard
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4The 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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5Garo 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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6Singrimari 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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7Mafic 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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8Fluvial 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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9In 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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10Thick lateritic cappings over granite gneiss and granites were observed at various locality of Ri-Bhoi district Meghalaya and well developed profiles can be seen along Guwahati-Shillong NH-40 (Figure 4). The main lithounits in the area are variants of gneisses of Precambrian Basement and granites of Nongpoh Pluton. The gneissic members comprise of granite gneiss, granite biotite gneiss, and dioritic gneiss, sillimanite gneiss with enclaves of amphibolite. Nongpoh Pluton (Neoproterozoic-Cambrian) is intrusive within the Precambrian Gneissic Complex and has two variants - porphyritic granite and grey non-porphyritic granite.
Mineralization
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