Provenance, timing of sedimentation and metamorphism of metasedimentary rock suites from the Southern Granulite Terrane, India

Pulak Sengupta, Michael M. Raith, Ellen Kooijman, Moumita Talukdar, Priyadarshi Chowdhury, Sanjoy Sanyal, Klaus Mezger, Dhruba Mukhopadhyay

Research output: Chapter in Book/Report/Conference proceedingChapter (Book)Researchpeer-review

15 Citations (Scopus)

Abstract

The Southern Granulite Terrane of India exposes remnants of an interbanded sequence of orthoquartzite-metapelite- calcareous rocks across the enigmatic Palghat-Cauvery Shear Zone (PCSZ), which has been interpreted as a Pan-African terrane boundary representing the eastward extension of the Betsimisaraka Suture Zone of Madagascar. Zircon U-Pb geochronology of metasedimentary rocks from both sides of the PCSZ shows that the precursor sediments of these rocks were sourced from the Dharwar Craton and the adjoining parts of the Indian shield. The similarity of the provenance and the vestiges of Grenvillian-age orogenesis in some metasedimentary rocks contradict an interpretation that the PCSZ is a Pan-African terrane boundary. The lithological association and the likely basin formation age of the metasedimentary rocks of the Southern Granulite Terrane show remarkable similarity to the rock assemblage and timing of sedimentation of the Palaeoproterozoic to Neoproterozoic shallow-marine deposits of the Purana basins lying several hundred kilometres north of this terrane. Integrating the existing geological information, it is postulated that the shallow-marine sediments were deposited on a unified land-mass consisting of a large part of Madagascar and the Indian shield that existed before Neoproterozoic time, part of which was later involved in the Pan-African orogeny.

Original languageEnglish
Title of host publicationPrecambrian Basins of India
Subtitle of host publicationStratigraphic and Tectonic Context
EditorsR MAZUMDER, P G ERIKSSON
Place of PublicationBath UK
PublisherGeological Society of London
Chapter20
Pages297-308
Number of pages12
Volume43
ISBN (Print)9781862397231
DOIs
Publication statusPublished - 2015
Externally publishedYes

Publication series

NameGeological Society Memoir
PublisherGeological Society of London
Volume43
ISSN (Print)0435-4052

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