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Provenance, timing of sedimentation and metamorphism of metasedimentary rock suites from the Southern Granulite Terrane, India
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0003-2377-8272
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2015 (English)In: Precambrian Basins of India: Stratigraphic and Tectonic Context / [ed] R. Mazumder & P.G. Eriksson, London: Geological Society of London, 2015Chapter in book (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
London: Geological Society of London, 2015.
Series
Geological Society, London, Memoirs, ISSN 2041-4722
Keyword [en]
Dharwar Craton, provenance, zircon, U-Pb, India, Southern Granulite Terrane
National Category
Geology Geochemistry Geosciences, Multidisciplinary
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-1527DOI: 10.1144/M43.20OAI: oai:DiVA.org:nrm-1527DiVA: diva2:877462
Available from: 2015-12-07 Created: 2015-12-07 Last updated: 2015-12-07Bibliographically approved

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Publisher's full texthttp://mem.lyellcollection.org/content/43/1/297

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CiteExportLink to record
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