Volume 45 Issue 5
May  2020
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Yang Kai, Liu Bin, Ma Changqian, Sun Yang, Zhang Fei, Mou Jinzhong, He Yu, Xiao Lu, 2020. Petrogenesis and Geodynamic Setting of Triassic Pyroxene Diorite-Porphyrite from the North Qiangtang Terrane: Geochronology, Mineral Petrogeochemistry and Sr-Nd-Hf Isotope Constraints. Earth Science, 45(5): 1490-1502. doi: 10.3799/dqkx.2019.163
Citation: Yang Kai, Liu Bin, Ma Changqian, Sun Yang, Zhang Fei, Mou Jinzhong, He Yu, Xiao Lu, 2020. Petrogenesis and Geodynamic Setting of Triassic Pyroxene Diorite-Porphyrite from the North Qiangtang Terrane: Geochronology, Mineral Petrogeochemistry and Sr-Nd-Hf Isotope Constraints. Earth Science, 45(5): 1490-1502. doi: 10.3799/dqkx.2019.163

Petrogenesis and Geodynamic Setting of Triassic Pyroxene Diorite-Porphyrite from the North Qiangtang Terrane: Geochronology, Mineral Petrogeochemistry and Sr-Nd-Hf Isotope Constraints

doi: 10.3799/dqkx.2019.163
  • Received Date: 2019-07-08
  • Publish Date: 2020-05-15
  • Although large volume of Triassic magmatism has been identified in the central Tibetan Plateau,the petrogenesis and geodynamic setting of these igneous rocks are still poorly understood. In this paper,we carried out a detailed study of zircon U-Pb geochronology,petrology,and geochemisrty for the diorite porphyrite in North Qiangtang terrane,aiming to reveal its petrogenesis and constaint the exploration of the Triassic tectonic-magmatic evolution. The LA-ICP-MS zircon U-Pb dating for this magmatic rock yields a crystallization age of 227±2 Ma (MSWD=0.86). All the samples have high contents of silicon and aluminum and belong to calc-alkaline series in composition. Compared with the primitive mantle,they exhibit enrichment of LREE,Th,and U,with depletion of Nb,Ta and Ti. All the samples have relatively low εNd(t) values (-4.53 to -4.99),relatively concentrated ISr values (0.707 05 to 0.707 14),and positive εHf(t) values (+0.81 to +2.48),suggesting an enriched mantle. Geochemical and isotopic variations reveal that the diorite-porphyrite was derived from partial melting of an enriched mantle that was previously modified by subduction-related components(e.g.,sediments). In addition,combined with the existing multi-disciplinary research data in the region,it could be concluded that the subduction of the Paleo-Tethyan ocean in the North Qiangtang terrane lasted at least to 227 Ma.

     

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