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    Constraints on the Tectonic Setting of the Andaman Ophiolites, Bay of Bengal, India, from SHRIMP U-Pb Zircon Geochronology of Plagiogranite

    151435_26905_constraints on the Tectonic Setting - Journal of Geology.pdf (450.4Kb)
    Access Status
    Open access
    Authors
    Sarma, D
    Jafri, S.
    Fletcher, Ian
    McNaughton, Neal
    Date
    2010
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Sarma, D. Srinivasa and Jafri, S.H. and Fletcher, Ian R. and McNaughton, Neal J. 2010. Constraints on the Tectonic Setting of the Andaman Ophiolites, Bay of Bengal, India, from SHRIMP U-Pb Zircon Geochronology of Plagiogranite. Journal of Geology. 118 (6): pp. 691-697.
    Source Title
    Journal of Geology
    DOI
    10.1086/656354
    ISSN
    00221376
    School
    Department of Applied Geology
    Remarks

    Copyright © 2010. University of Chicago Press. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/5000
    Collection
    • Curtin Research Publications
    Abstract

    The Andaman ophiolites are well exposed in the Andaman group of islands, which is part of the Sunda-Burmesedouble-chain arc system in the Bay of Bengal, India. Plagiogranites occurring on the eastern margin of the southernpart of South Andaman Island appear as interstitial vermicular and micrographic intergrowths of quartz and plagioclase.They are tonalitic to trondhjemitic in composition, and their Rb, Yb, Ta, and Y abundances are characteristicof a volcanic-arc affinity. Sensitive high-resolution ion microprobe U-Pb dating of zircons from a plagiogranite withinthe Andaman ophiolite has yielded a weighted mean 206Pb/238U age of 93.61.3 Ma, interpreted as the age of itscrystallization. The subduction-related plagiogranite has intruded a gabbro unit of the Andaman ophiolites as wellas extrusives of the East Coast Volcanics at this time. Since the Andaman ophiolitic rocks predate the plagiogranite,they cannot have been generated in the currently active Late Miocene Andaman-Java subduction zone and were mostlikely obducted onto the leading edge of the Eurasian continent at an earlier phase of subduction activity during earlyCretaceous time.

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