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    Reply to the comments on “Xenoliths in ultrapotassic volcanic rocks in the Lhasa block: direct evidence for crust–mantle mixing and metamorphism in the deep crust”

    Access Status
    Fulltext not available
    Authors
    Wang, R.
    Collins, William
    Weinberg, R.
    Richards, J.
    He, W.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, R. and Collins, W. and Weinberg, R. and Richards, J. and He, W. 2017. Reply to the comments on “Xenoliths in ultrapotassic volcanic rocks in the Lhasa block: direct evidence for crust–mantle mixing and metamorphism in the deep crust”. Contributions to Mineralogy and Petrology. 172 (4): Article ID 20.
    Source Title
    Contributions to Mineralogy and Petrology
    DOI
    10.1007/s00410-017-1333-5
    ISSN
    0010-7999
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/53634
    Collection
    • Curtin Research Publications
    Abstract

    Stepanov et al. (Contrib Mineral Petrol, 2017) question our conclusion that the UPVs in southern Tibet were derived by partial melting of an old, metasomatized subcontinental lithospheric mantle (SCLM) of the subducted Indian plate. Instead, they propose that these ultrapotassic volcanic rocks (UPVs) are shoshonitic and were generated in two steps: direct melting of crustal rocks first, and then the melts interacted with mantle peridotite. However, the trace element, isotopic, thermal, structural, and seismic evidence is consistent with the xenolith evidence (Wang et al in Contrib Mineral Petrol 172:62, 2016) for hybridisation of ascending Indian subcontinental lithospheric mantle-derived UPV magmas with the deep, isotopically unevolved, Tibetan crust. This necessitates a model whereby partial melting of subducting Indian SCLM generates the UPV suite of southern Tibet.

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