Journal
JOURNAL OF ASIAN EARTH SCIENCES
Volume 22, Issue 2, Pages 115-129Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1367-9120(02)00180-3
Keywords
Bundelkhand Craton; Bastar Craton; continent-continent collision
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The Precambrian crust of Central India comprising Bundelkhand Craton (BKC) in the north and Bastar Craton (BC) in the south were accreted along a ENE-WSW trending Proterozoic Central Indian Tectonic Zone (CITZ). The CITZ is an ensemble of several low- to medium-grade supracrustal belts, gneisses, granitoids and a few linear tracts of granulite belts. A number of crustal scale shear zones define the boundaries of the supracrustal belts and discrete terrains. Available data suggest polyphase tectonothermal events in CITZ, spanning from Palaeoproterozoic to early Neoproterozoic. Each event is characterized by contractional tectonic regime and attendant metamorphism and magmatism. A new plate tectonic model, in contrast to the earlier one of Yedekar et at. [Geol. Surv. India Spec. Publ. 28 (1990)], is proposed. According to the present model a northward dipping subduction system leading to continent-continent collision explains the growth and assembly of the CITZ. The continent-continent collision is tentatively placed at ca. 1.5 Ga, which is comparable to similar tectonothermal event in Chotanagpur Gneissic Complex further east. While the suturing event predates the global Grenvillian Orogeny (similar toca. 1.3 - 1.0 Ga), the Sausar tectonothermal event (ca. 1.1-0.9 Ga) of CITZ is correlatable with the latter. (C) 2003 Elsevier Ltd. All rights reserved.
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