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Xue-yuan HU, Rui-qing GUO, NUER Kanati·Madayipu, Yu GUO, Ming-yu ZOU, Biao LÜ, Zhen WEI. Zircon U-Pb Dating, Petrology, Geochemistry of the Buya Pluton and Its MMEs in the Southern Margin of Tarim, Xinjiang[J]. Rock and Mineral Analysis, 2017, 36(5): 538-550. DOI: 10.15898/j.cnki.11-2131/td.201703190035
Citation: Xue-yuan HU, Rui-qing GUO, NUER Kanati·Madayipu, Yu GUO, Ming-yu ZOU, Biao LÜ, Zhen WEI. Zircon U-Pb Dating, Petrology, Geochemistry of the Buya Pluton and Its MMEs in the Southern Margin of Tarim, Xinjiang[J]. Rock and Mineral Analysis, 2017, 36(5): 538-550. DOI: 10.15898/j.cnki.11-2131/td.201703190035
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Zircon U-Pb Dating, Petrology, Geochemistry of the Buya Pluton and Its MMEs in the Southern Margin of Tarim, Xinjiang

  • College of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China

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  • Received Date: March 18, 2017
  • Revised Date: June 14, 2017
  • Accepted Date: July 19, 2017
  • Published Date: August 31, 2017
    Abstract
  • Highlights
    · The Buya quartz monzobiorite was formed at 432.6±2.5 Ma, and its mafic microgranular enclaves (MMEs) were formed at 432.4±6.4 Ma.
    · Mafic microgranular enclaves (MMEs) are globules of a more mafic magma that was injected into and mingled with the host felsic magma.
    · They are the Early Paleozoic collision orogenesis of the late magmatic activity records from the southern margin of Tarim.
    Paleozoic acidic intrusive rocks are widespread in the Tiekelike tectonic belt of the southern margin of Tarim. Petrography, whole-rock major and trace elements, and zircon U-Pb dating are reported for the Buya granodiorite and its mafic microgranular enclaves (MMEs), which are used to constrain their petrogenesis and tectonic setting. High-precision LA-MC-ICP-MS zircon U-Pb dating has revealed that the quartz monzobiorite was formed at 432.6±2.5 Ma (MSWD=1.5), and its microgranular enclaves were formed at 432.4±6.4 Ma (MSWD=0.031) indicating that both of them are the products of early Silurian magma activity. Chemical composition suggests that the enclaves were derived from partial melting of the mantle, while the magma of the host rocks is mainly crustal and is mixed with minor mantle-derived magma. Both the field and petrographic characteristics show that the dark enclaves were formed by the rapid condensation of the mafic magma into the felsic magma, which is the product of the magmatic mixing by the mantle underplating of the lower crust. They are magmatic records of the late stage of early Paleozoic collision orogeny in the southern margin of Tarim.
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    • References (43)
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