Zircon U-Pb age, geochemical data: Constraints on the origin and tectonic evolution of the metamafic rocks from Longmuco-Shuanghu-Lancang suture zone, Tibet
作者： Yanwang Wu , Cai Li , Mengjing Xu , Chaoming Xie , Ming Wang
DOI: 10.1007/S12583-017-0730-Z
关键词:
摘要: Bulk-rock major and trace elements 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 geodynamic setting ophiolitic fragments. isotopic dating using SHRIMP Ⅱ method reveals that were formed at 274.7±3.9 279.8±3.6 Ma. The mostly show N-MORB-typed rare earth element patterns enrichment large-ion lithophile elements, indicating they probably derived partial melting a depleted back-arc basin. Our data, together with recent studied on Paleozoic fragments suggest Paleo-Tethys Ocean Central Qiangtang opened Cambrian widened between Ordovician Devonian. Northward subduction started Late Devonian–Early Carboniferous basin developed during Permian.
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