Geochemistry and LA-ICP-MS zircon U-Pb dating of the Dongjiahe ophiolite complex from the western Bikou terrane  

作　　者：LAI ShaoCong LI YongFei QIN JiangFeng 

机构地区：[1]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　　处：《Science China Earth Sciences》2007年第z2期305-313,共9页中国科学（地球科学英文版）

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

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.

关 键 词：ophiolite  geochemistry  tectonics  ZIRCON LA-ICP-MS U-PB dating  northern Yangtze block 

分 类 号：N[自然科学总论]