http://www.sciencedirect.com/science/article/pii/S167498711100106X |
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Authors: | S Mohanty |
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Institution: | Department of Applied Geology,Indian School of Mines,Dhanbad 826 004,India |
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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. |
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Keywords: | Paleoproterozoic Supercontinent Capricorn Orogeny Satpura Orogeny |
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