Volume 45 Issue 8
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Li Yong, Zhang Shizhen, Li Fenqi, Qin Yadong, 2020. Geochronology, Geochemistry and Petrogenesis of Late Jurassic Granitoids in Shiquanhe Area, Western Lhasa Block, Tibet. Earth Science, 45(8): 2846-2856. doi: 10.3799/dqkx.2020.102
Citation: Li Yong, Zhang Shizhen, Li Fenqi, Qin Yadong, 2020. Geochronology, Geochemistry and Petrogenesis of Late Jurassic Granitoids in Shiquanhe Area, Western Lhasa Block, Tibet. Earth Science, 45(8): 2846-2856. doi: 10.3799/dqkx.2020.102
shu

Geochronology, Geochemistry and Petrogenesis of Late Jurassic Granitoids in Shiquanhe Area, Western Lhasa Block, Tibet

doi: 10.3799/dqkx.2020.102

  • Chengdu Center of China Geological Survey, Chengdu 610081, China

  • Received Date: 2020-03-25
  • Publish Date: 2020-08-15
    Abstract
  • There are relatively few reports on the Mesozoic magmatic rocks in the Shiquanhe area of western Lhasa Block, which limits the understanding of the Mesozoic magmatism in this area. In this paper, it presents the major element, trace element and zircon U-Pb age data of bulk-rock for the host quartz diorite and dioritic enclaves from the Shiquanhe area. The zircon dating yields U-Pb age of 161.1±1.7 Ma for the host quartz diorite, of 159.8±1.6 Ma and 157.0±1.3 Ma respectively for dioritic enclaves, indicating that the host quartz diorite and dioritic enclaves have similar crystallization ages and they both formed at Late Jurassic. The host quartz diorite is metaluminous and calc-alkaline to high K calc-alkaline I-type granitoids. They are enriched in large ion lithopile elements, and depleted in high field strength elements. The dioritic enclaves are metaluminous and calc-alkaline to high K calc-alkaline. Based on the data in this study and previous ones, it is proposed that Late Jurassic quartz diorite was formed in tectonic setting of the southward subduction of Bangongco-Nujiang Neo-Tethyan oceanic seafloor, and generated by the magma mixing between mantle-derived basic magma and acidic magma formed by the melting of the ancient crustal material of Lhasa Block.

     

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