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http://www.sciencedirect.com/science/article/pii/S167498711100106X
Authors:S. Mohanty
Affiliation:Department of Applied Geology,Indian School of Mines,Dhanbad 826 004,India
Abstract:Reconstruction of theNeoproterozoic supercontinent Rodinia shows near neighbour positions ofthe South Indian Cratons andWesternAustralian Cratons. These cratonic areas are characterized by extensivePaleoproterozoic tectonism. Detailed analysis of the spatio-temporal data of the Satpura Mountains of Indiaindicates presence of at least three episodes of Proterozoic orogeny at w2100e1900 Ma, w1850 Maandw1650 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 Australiaalso shows three episodes of orogeny: OpthalmianeGlenburgh Orogeny (2100e1950 Ma), CapricornOrogeny (w1800 Ma) andMangaroon Orogeny (w1650 Ma), and basin opening and closing related to thesetectonic movements. These broad similarities suggest their joint evolution possibly in a near neighbour positionduring Paleoproterozoic Era. In view of juxtaposition of the Western Australia along the east coast ofIndia, at the position of the Eastern Ghats, during Archean, it is suggested that the breaking of this Archeanmegacraton at w2400 Ma led to northward movement of the broken components and formation of theSatpuraeCapricorn Orogen (atw2100 andw1800 Ma) due to the collision of cratonic blocks with the preexistingnorthern 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 anotherphase of collisional event atw1600 Ma at the site of the SatpuraeCapricorn Orogen. Subsequent evolutionsof the Satpura and the Capricorn Orogens differ slightly, indicating separate evolutional history.
Keywords:Paleoproterozoic   Supercontinent   Capricorn Orogeny   Satpura Orogeny
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