Abstract
The nature (i.e., sub-oceanic, sub-arc or sub-continental) of ophiolitic mantle peridotites from the eastern Neo-Tethyan domain in southern Tibet has been hotly debated. This uncertainty limits our understanding of the history and evolution of the eastern Neo-Tethys Ocean. Here we present petrological, geochemical and Re–Os isotopic data for the mantle peridotites from the Dazhuqu ophiolite in the central segment of the Yarlung Zangbo suture zone, southern Tibet. Samples collected include both spinel lherzolites and spinel harzburgites. The lherzolites have spinel Cr# [Cr/(Cr + Al), ~ 0.3–0.4] comparable to those of typical abyssal peridotites. In contrast, the harzburgites have spinel Cr# (~ 0.3–0.7) overlapping with the ranges of both abyssal and fore-arc peridotites; two samples have spinel Cr# higher than 0.6, which is probably ascribed to intense melt–rock interactions. Clinopyroxene trace element modeling indicates that the Dazhuqu mantle peridotites have experienced 0–6% garnet-facies melting followed by 10–18% melting in the spinel stability field. This is similar to the degree of garnet-facies melting inferred for many abyssal peridotites and implies deep initial melting (> 85 km), which distinguishes the Dazhuqu mantle peridotites from fore-arc peridotites (commonly < 80 km in origin). The Dazhuqu peridotites have unradiogenic 187Os/188Os of 0.11836–0.12922, which are commonly lower than the recommended value of primitive upper mantle (PUM). All but one samples yield relatively younger Re depletion ages (TRD = 0.06–0.81 Ga) with respect to the only one sample having an older TRD age of 1.66 Ga. Re–Os isotopes and highly siderophile element (HSE) compositions of the Dazhuqu peridotites are similar to those of abyssal peridotites and the Oman southern massifs but are distinct from non-cratonic sub-continental lithospheric mantle (SCLM) xenoliths and sub-arc mantle. We emphasize the similarity between the Dazhuqu and Oman ophiolites, both representing Neo-Tethyan oceanic lithosphere and implying ridge–trench collision.
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Acknowledgements
We thank Hong-Yue Wang, Ding-Shuai Xue and Yan-Hong Liu for their help in whole-rock major element analysis, Di Zhang for assistance with EPMA, and Yue-Heng Yang and Zhu-Yin Chu for help in mineral trace element, Re-Os isotope and HSE content analyses. We are grateful to Editor in Chief Othmar Müntener for editorial handling and helpful comments and to David van Acken and an anonymous reviewer for constructive comments and suggestions. Comments from Laurie Reisberg also improved the quality of an early version of the manuscript. This study was financially supported by the National Natural Science Foundation of China (grants 41673038, 41521062), the Key Research Program of Frontier Sciences from CAS (QYZDB-SSW-DQC032) and the Open Fund Project of State Key Laboratory of Lithospheric Evolution (201707).
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Liu, T., Wu, FY., Liu, CZ. et al. Reconsideration of Neo-Tethys evolution constrained from the nature of the Dazhuqu ophiolitic mantle, southern Tibet. Contrib Mineral Petrol 174, 23 (2019). https://doi.org/10.1007/s00410-019-1557-7
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DOI: https://doi.org/10.1007/s00410-019-1557-7