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The Chitradurga greenstone succession in south India and evolution of the late Archaean basin

Published online by Cambridge University Press:  01 May 2009

P. K. Bhattacharyya ,
H. N. Bhattacharya  and
A. D. Mukherjee
P. K. Bhattacharyya
Affiliation:
Department of Geological Sciences, Jadavpur University, Calcutta-700032 India
H. N. Bhattacharya
Affiliation:
Department of Geology, Durgapur Govt. College, Durgapur-713214, W. B., India
A. D. Mukherjee
Affiliation:
Department of Geological Sciences, Jadavpur University, Calcutta-700032 India
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Abstract

The Chitradurga greenstone succession of south India comprises a thick pile (~ 10 km) of late Archaean volcanic flows and terrigenous clastic sediments, metamorphosed from greenschist to low-grade amphilobite facies. An older near-shore sedimentary sequence of cratonic affiliation and an off-shore bimodal volcanic sequence were deposited contemporaneously on a gneissic basement. The volcanics are metasomatically altered, and major, minor and trace element data fail to discriminate the metavolcanics in terms of modern plate settings. A younger turbidite sequence of coarser elastics covered the older deposits without any apparent tectonic or erosional break. All the rocks of the succession display evidence of similar deformation, prior to invasion by younger granites (~ 2.5 Ga)in a late syn-kinematic phase.

This suggests that initially a simple flat-lying downwarp in a continental crust served as the passive receptacle of the platform-type sediments, and also witnessed volcanism along extensional faulting. This phase of the basin was not associated with any compressive deformation. Subsidence of the Chitradurga basin by the denser volcanics and uplift in the gneissic borderlands provided the infrastructure for subsequent development of the younger turbidite sequence covering the still virtually undeformed older deposits. A compressive orogeny, accompanied by granitic intrusion (~ 2.5Ga) in a late kinematic phase, ultimately deformed and uplifted the basin-fill during the declining phase of basinal activity.

There is no evidence in the belt to suggest that the plate-tectonic (Wilson cycle) processes, pending a terminal orogeny, were operative during evaluation of the Chitradurga basin.

Type
Articles
Information
Geological Magazine , Volume 125 , Issue 5 , September 1988 , pp. 507 - 519
Copyright
Copyright © Cambridge University Press 1988

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