Thick-skinned tectonics in the Central Indian Tectonic Zone, Satpura Orogen

What is it about?

Use of geophysical data interpretation provides an unique model to identify ancient sutures (using the presence of double Moho) and polarity of subduction.

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Why is it important?

The controversies of the position of the suture and polarity of subduction in the Central Indian Tectonic Zone (CITZ) are resolved in this paper. The tectonic model presented here does not support the models of 1600 and 1000 Ma continental amalgamation along CITZ; the events were involved in reactivation of old thrusts by far-field stresses from Delhi - Eastern Ghats Orogenic events. The earlier models to explain ultrahigh temperature metamorphism (accompanied by moderately high pressure) in an extensional regime does not find support for opposite polarity of subduction. On the other hand basal accretion resulting in thickened crust can explain both temperature and pressure. The time of collision and continental amalgamation has been constrained from erosion of the upper crust and detrital zircons in the sedimentary successions in the basins bordering the Satpura Orogen.