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    Eocene magmatism in the Himalaya: Response to lithospheric flexure during early Indian collision?

    96208.pdf (1.022Mb)
    Access Status
    Open access
    Authors
    Ma, L.
    Wang, Q.
    Kerr, A.C.
    Li, Zheng-Xiang
    Dan, W.
    Yang, Y.N.
    Zhou, J.S.
    Wang, J.
    Li, C.
    Date
    2023
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Ma, L. and Wang, Q. and Kerr, A.C. and Li, Z.X. and Dan, W. and Yang, Y.N. and Zhou, J.S. et al. 2023. Eocene magmatism in the Himalaya: Response to lithospheric flexure during early Indian collision? Geology. 51 (1): pp. 96-100.
    Source Title
    Geology
    DOI
    10.1130/G50438.1
    ISSN
    0091-7613
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FL150100133
    URI
    http://hdl.handle.net/20.500.11937/96444
    Collection
    • Curtin Research Publications
    Abstract

    Eocene mafic magmatism in the Himalaya provides a crucial window for probing the evolution of crustal anatexis processes within the lower plate in a collisional orogen. We report geochemical data from the earliest postcollision ocean-island basalt–like mafic dikes intruding the Tethyan Himalaya near the northern edge of the colliding Indian plate. These dikes occurred coeval, and spatially overlap, with Eocene granitoids in the cores of gneiss domes and were likely derived from interaction between melts from the lithosphere-asthenosphere boundary and the Indian continental lithosphere. We propose that these mafic magmas were emplaced along lithospheric fractures in response to lithospheric flexure during initial subduction of the Indian continent and that the underplating of such mafic magmas resulted in orogen-parallel crustal anatexis within the Indian continent. This mechanism can explain the formation of coeval magmatism and the geologic evolution of a collisional orogen on both sides of the suture zone.

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