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Volume 28 Issue 3
Jun 2017
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Journal of Earth Science  > 2017  >  28(3): 422-432.
Yanwang Wu, Cai Li, Mengjing Xu, Chaoming Xie, Ming Wang. Zircon U-Pb Age, Geochemical Data: Constraints on the Origin and Tectonic Evolution of the Metamafic Rocks from Longmuco-Shuanghu-Lancang Suture Zone, Tibet. Journal of Earth Science, 2017, 28(3): 422-432. doi: 10.1007/s12583-017-0730-z
Citation: Yanwang Wu, Cai Li, Mengjing Xu, Chaoming Xie, Ming Wang. Zircon U-Pb Age, Geochemical Data: Constraints on the Origin and Tectonic Evolution of the Metamafic Rocks from Longmuco-Shuanghu-Lancang Suture Zone, Tibet. Journal of Earth Science, 2017, 28(3): 422-432. doi: 10.1007/s12583-017-0730-z
shu

Zircon U-Pb Age, Geochemical Data: Constraints on the Origin and Tectonic Evolution of the Metamafic Rocks from Longmuco-Shuanghu-Lancang Suture Zone, Tibet

doi: 10.1007/s12583-017-0730-z
  • 1.

    School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, China

  • 2.

    College of Earth Science, Jilin University, Changchun 130061, China

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    Abstract
  • Bulk-rock major and trace elements and zircon U-Pb data are reported for Permian metamafic rocks from Guoganjianan, in the western part of Longmuco-Shuanghu-Lancang suture zone. These results offer new insights into mantle source characteristics and geodynamic setting of Permian ophiolitic fragments. U-Pb isotopic dating using SHRIMP Ⅱ method reveals that the metamafic rocks were formed at 274.7±3.9 and 279.8±3.6 Ma. The metamafic rocks mostly show N-MORB-typed rare earth element patterns and are enrichment in large-ion lithophile elements, indicating that they are probably derived from partial melting of a depleted mantle in a back-arc basin. Our new data, together with recent studied results on Paleozoic ophiolitic fragments suggest the Paleo-Tethys Ocean in Central Qiangtang opened at Cambrian and widened between Ordovician and Devonian. Northward subduction started in the Late Devonian–Early Carboniferous and a back-arc basin developed during Permian.

     

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