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http://www.sciencedirect.com/science/article/pii/S167498711100106X
Authors:S Mohanty
Institution:Department of Applied Geology,Indian School of Mines,Dhanbad 826 004,India
Abstract:Reconstruction of theNeoproterozoic supercontinent Rodinia shows near neighbour positions of the South Indian Cratons andWesternAustralian Cratons. These cratonic areas are characterized by extensive Paleoproterozoic tectonism. Detailed analysis of the spatio-temporal data of the Satpura Mountains of India indicates presence of at least three episodes of Proterozoic orogeny at w2100e1900 Ma, w1850 Ma andw1650 Ma, and associated basin development and closing. A subdued imprint of the Grenville orogeny (w950 Ma) is also found in rock records of this Mountain Belt. The Capricorn Orogen ofWestern Australia also shows three episodes of orogeny: OpthalmianeGlenburgh Orogeny (2100e1950 Ma), Capricorn Orogeny (w1800 Ma) andMangaroon Orogeny (w1650 Ma), and basin opening and closing related to these tectonic movements. These broad similarities suggest their joint evolution possibly in a near neighbour position during Paleoproterozoic Era. In view of juxtaposition of the Western Australia along the east coast of India, at the position of the Eastern Ghats, during Archean, it is suggested that the breaking of this Archean megacraton at w2400 Ma led to northward movement of the broken components and formation of the SatpuraeCapricorn Orogen (atw2100 andw1800 Ma) due to the collision of cratonic blocks with the preexisting northern cratonic nuclei of India and Western Australia. This is also the time of formation of the supercontinent Columbia. A phase of basin opening followed the w1800 Ma event, followed by another phase of collisional event atw1600 Ma at the site of the SatpuraeCapricorn Orogen. Subsequent evolutions of the Satpura and the Capricorn Orogens differ slightly, indicating separate evolutional history.
Keywords:Paleoproterozoic  Supercontinent  Capricorn Orogeny  Satpura Orogeny
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