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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Indian Peninsula
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India
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Rajasthan India (1)
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Southern Granulite Terrain (1)
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Tamil Nadu India (1)
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geologic age
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Precambrian
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upper Precambrian
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igneous rocks
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Primary terms
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Asia
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Indian Peninsula
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India
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Rajasthan India (1)
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Southern Granulite Terrain (1)
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Tamil Nadu India (1)
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chemical analysis (1)
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igneous rocks
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Precambrian
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upper Precambrian
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Proterozoic
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Neoproterozoic (1)
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Significance of ∼1Ga granites from the South Delhi Fold Belt, NW India: Implications for paleogeographic reconstructions of Rodinia
Evidence of fluid-induced myrmekite formation after alkali-feldspar megacrysts: an example from a meta-porphyritic granitoid in Makrohar, Madhya Pradesh, India
Petrological implications of element redistribution during metamorphism: insights from meta-granite of the South Delhi Fold Belt, Rajasthan, India
Origin of corundum within anorthite megacrysts from anorthositic amphibolites, Granulite Terrane, Southern India
Genesis of coronae and implications of an early Neoproterozoic thermal event: a case study from SE Chotanagpur Granite Gneissic Complex, India
Abstract Understanding the evolution of the Chotanagpur Granite Gneiss Complex (CGGC) of the East Indian Shield is crucial to decipher the role of the Indian Shield in the formation of the Rodinia supercontinent. The area around Deoghar–Dumka exposes a suite of granulite-facies orthogneisses (variably retrogressed to amphibole–biotite gneiss) that enclose remnants of Palaeoproterozoic metasedimentary and meta-igneous rocks. Results from mineral chemistry, laser ablation inductively coupled plasma mass spectrometry (LA ICP-MS) U–Pb dating of zircon and limited bulk-rock compositions of the studied rocks suggest that the magmatic protoliths of the felsic orthogneisses had A-type chemistry, and that these were emplaced at approximately 1450 Ma presumably in a continental rift setting. Intense deformation and metamorphism of the felsic rock culminated at approximately 9 kbar and 850°C along an apparent geothermal gradient of 26°C km −1 . These peak metamorphic conditions were successively followed by initially a steeply decompressive and then a weakly decompressive retrograde pressure–temperature path. The shape of the retrograde pressure–temperature path and the estimated geothermal gradient at the metamorphic peak are interpreted to be the products of continent–continent collision; U–Pb dates of metamorphic zircon overgrowths suggest an age of approximately 943 Ma for the collisional event. This study demonstrates that ‘Grenville-age’ orogenesis thoroughly reworked the approximately 1450 myr-old basement of the CGGC during the formation of the Rodinia supercontinent.