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    Basin Analysis of the Albian–Santonian Xigaze Forearc, Lazi Region, South-Central Tibet

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    Orme_Laskowski_merged_7116.pdf
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    Description:
    Final Accepted Manuscript
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    Author
    Orme, Devon A.
    Laskowski, Andrew K.
    Affiliation
    University of Arizona, Department of Geosciences
    Issue Date
    2016-08-12
    
    Metadata
    Show full item record
    Publisher
    SEPM-SOC SEDIMENTARY GEOLOGY
    Citation
    Basin Analysis of the Albian–Santonian Xigaze Forearc, Lazi Region, South-Central Tibet 2016, 86 (8):894 Journal of Sedimentary Research
    Journal
    Journal of Sedimentary Research
    Rights
    Copyright © 2016, SEPM (Society for Sedimentary Geology).
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The Xigaze forearc basin records the evolution of the southern Lhasa terrane convergent margin, largely affected by Neo-Tethyan subduction processes, prior to the Paleocene Tethyan Himalaya-Eurasia collision. New geologic mapping and U-Pb detrital-zircon geochronologic data from the Lazi region, 340 km southeast of Lhasa, show that forearc basin sedimentation began ca. 110 Ma conformably atop the Yarlung-Tsangpo ophiolitic melange. By this time, the arc-trench system along the southern margin of the Lhasa terrane (Eurasia) consisted of an accretionary complex, overlying ophiolitic melange, the Xigaze forearc basin, and the Gangdese magmatic arc. There is no geological evidence in the Lazi region for more than one subduction zone between the southern Lhasa terrane margin and India. Sedimentological facies analysis from Albian to Santonian clastic and carbonate sedimentary rocks preserved in the Xigaze forearc basin indicate deep-marine sedimentation characterized by hemipelagic carbonate and volcanogenic sediment-gravity-flow deposits. Sandstone modal petrographic and U-Pb detrital-zircon geochronologic data reveal Asian continental margin, Gangdese magmatic arc, and central to northern Lhasa terrane provenance. During this time, basin fill was deposited in cycles of high and low sediment flux characterized by alternating successions of clastic turbidite inner- to outer-fan deposits and hemipelagic limestone and marlstone sequences. Along-strike differences in the timing of initial forearc basin sedimentation are likely the result of intra-basin topography and/or diachronous development of ophiolitic forearc basement.
    Note
    12 month embargo. First available online Aug 12 2016.
    ISSN
    1527-1404
    DOI
    10.2110/jsr.2016.59
    Version
    Final accepted manuscript
    Additional Links
    http://jsedres.sepmonline.org/lookup/doi/10.2110/jsr.2016.59
    ae974a485f413a2113503eed53cd6c53
    10.2110/jsr.2016.59
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