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

被引：29
|
作者：
Lai ShaoCong [1 ]
Li YongFei [1 ]
Qin JiangFeng [1 ]
机构：
[1] NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
来源：
SCIENCE IN CHINA SERIES D-EARTH SCIENCES | 2007年 / 50卷 / Suppl 2期
基金：
中国国家自然科学基金;
关键词：
ophiolite; geochemistry; tectonics; zircon LA-ICP-MS U-Pb dating; northern Yangtze block;
D O I：
10.1007/s11430-007-6006-1
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
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.
引用
收藏
页码：305 / 313
页数：9
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