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Publication Detail
Mithakhari deposits
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Bandopadhyay PC, Carter A
  • Publication date:
    01/01/2017
  • Pagination:
    111, 132
  • Journal:
    Geological Society Memoir
  • Volume:
    47
  • Issue:
    1
  • Status:
    Published
  • Print ISSN:
    0435-4052
Abstract
© 2017 The Author(s). Published by The Geological Society of London. The rocks assigned to the Mithakhari Melange are composed of conglomerates, gritty and coarse- to fine-grained volcano-lithic to quartzo-feldspathic sandstones, andesitic tuff, siltstone, mudstones, shale, carbonaceous shale and limestones. They occur as coherent and chaotic units as part of the regionally extensive melange terrane and include olistoliths of pre-ophiolite metasedimentary rocks, ophiolitic ultramafics and basalts, and pelagic-hemipelagic sediments. This chapter describes and assesses the established lithostratigraphic units and examines their palaeontology, geochemistry and geochronology. Focusing on the units with a strong arc signature we consider environments of deposition and palaeogeography. We confirm the existence of active andesite volcanism on the arc massif located east of Andaman arc on the western margin of the Burma-Thai-Malaya peninsula during the Eocene-Oligocene, before the opening of the Andaman Sea in the midMiocene, and argue that the Namunagarh Grit, dominated by pyroclast-rich gravity flows, should be treated as a separate unit in studies ofTertiary stratigraphy of Andaman Island. Consideration of the other established units (Hope Town conglomerate and Lipa Shale) suggest these associated rocks types are localized, commonplace and unlikely to be stratigraphically related.
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