Geochemistry and LA-ICP-MS zircon U-Pb dating of the Dongjiahe ophiolite complex from the western Bikou terrane
Geochemistry and LA-ICP-MS zircon U-Pb dating of the Dongjiahe ophiolite complex from the western Bikou terrane作者机构：State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China
出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)
年 卷 期：2007年第50卷第z2期
页 面：305-313页
核心收录：
基 金：Supported jointly by the National Natural Science Foundation of China (Grant Nos. 40572050 and 40234041) and the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE China
主 题：ophiolite, geochemistry, tectonics, zircon LA-ICP-MS U-Pb dating, northern Yangtze block
摘 要：The Dongjiahe ophiolite complex occurring in the western Bikou terrane that is composed chiefly of serpentinite, listwanitizational peridotite, gabbro, cumulus gabbro, and sub-alkaline meta-basalt, possesses a rock association of typical ophiolite sequence. The metaperidotite is depleted in light rare earth element (LREE), whereas the gabbro and meta-basalt from the studied ophiolite sequence, generated by the same parental magmas those have close affinity to the MORB (Mid-ocean ridge basalt), their REE and immobile elements patterns imply an ocean in the northern margin of the Yangtze plate during the Neoproterozoic period. The zircon LA-ICP-MS U-Pb dating for the gabbro yields a weighted mean age of 839.2±8.2Ma, suggesting that the basin occurred during the Neoproterozoic period.
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