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    Tectonostratigraphic evolution of the Nellore schist belt, southern India, since the Neoarchaean

    Access Status
    Fulltext not available
    Authors
    Saha, D.
    Sain, A.
    Nandi, P.
    Mazumder, Rajat
    Kar, R.
    Date
    2015
    Type
    Book Chapter
    
    Metadata
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    Citation
    Saha, D. and Sain, A. and Nandi, P. and Mazumder, R. and Kar, R. 2015. Tectonostratigraphic evolution of the Nellore schist belt, southern India, since the Neoarchaean, in Mazumder, R. and Eriksson, P. (ed), Precambrian basins of India: stratigraphic and tectonic contexts, pp. 269-282. London: Geological Society.
    Source Title
    Precambrian basins of India: stratigraphic and tectonic context
    DOI
    http://doi.org/10.1144/M43.18
    ISBN
    978-1-86239-723-1
    School
    Curtin Sarawak
    URI
    http://hdl.handle.net/20.500.11937/32832
    Collection
    • Curtin Research Publications
    Abstract

    Tectonostratigraphic development of the c. 300 km-long Nellore schist belt (NSB) of southern India is described in relation to the post-Neoarchaean growth of the Dharwar cratonic nucleus. Lying along the eastern margin of the Dharwar cratonic nucleus, the NSB comprises several geologically and geochemically distinct tracts of deformed Palaeoproterozoic to Mesoproterozoic volcanosedimentary successions: the Vinjamuru Group, the Kandra ophiolite complex (KOC), the Kanigiri ophiolitic melange (KOM) and the Udaigiri Group, arranged in relative order of younging. The high-grade Eastern Ghats belt occurs further to the east of the NSB with a tectonic contact. Thrust-transported oceanic crust remnants occur in the 1.9 Ga KOC, 1.34 Ga KOM, and the Vinjamuru Group, which show multiple deformation, amphibolite facies metamorphism and granitic intrusions. The available geological, geochemical and geochronological data have been examined to tentatively constrain the relative age of the different tectonostratigraphic units of the NSB, tectonic juxtaposition and implications in relation to global events in the Proterozoic. Subduction-related ocean closures outboard and east of the Dharwar Craton, evidenced by the KOC and KOM, possibly had links with the assembly of Columbia and its final dispersal, respectively.

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