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- W2955886001 abstract "Fifteen Lower Permian siliciclastic rocks from central Tibet were analysed for the major and trace elements, and ten samples among them were chosen for determination of Nd isotopic compositions. They are characterized by low concentrations of SiO 2 and low ratios of SiO 2 /Al 2 O 3 , moderate abundances of Fe 2 O 3 + MgO (mudstones, 7.28–9.72 wt.%; sandstones, 4.62–10.02 wt.%) and TiO 2 (mudstones, 0.55–0.95 wt.%; sandstones, 0.53–0.99 wt.%), significant enrichments of light rare‐earth elements (LREEs) relative to the heavy REEs (HREEs; average (La/Yb) N = 9.8 [mudstones] and 9.48 [sandstones]), flat HREE distribution, obvious negative Eu anomalies (average Eu/Eu* = 0.68), higher Th/Sc and La/Sc ratios, and negative initial ε Nd values (on average −7.2 and −8.5 for sandstones and mudstones, respectively). The mixing modal analysis based on some elemental pairs and Nd isotopic composition, respectively, Nd depleted mantle model age ( T DM ) and initial ε Nd values, uniformly indicates that about 30–40% mafic materials could have been added into these sedimentary rocks. These siliciclastic rocks could have formed in a setting of rifting between the Lhasa and Qiangtang blocks, when a 280 Ma mantle plume upwelling event was occurring in northern Gondwana." @default.
- W2955886001 created "2019-07-12" @default.
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- W2955886001 date "2019-07-02" @default.
- W2955886001 modified "2023-10-16" @default.
- W2955886001 title "Geochemistry and Nd isotopes of Lower Permian siliciclastic rocks from central Tibet, western China: Evidence for Early Permian initiation of the rifting between the Lhasa and Qiangtang blocks?" @default.
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- W2955886001 doi "https://doi.org/10.1002/gj.3564" @default.
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