地质学报2012，Vol.86Issue(6)：961-971,11.
北山地区月牙山-洗肠井蛇绿岩的地球化学特征及形成环境
Geochemical Characteristics and Tectonic Setting and of the Yueyashan-Xichangjing Ophiolite in the Beishan Area
摘要
Abstract
The YueyashairXichangjing ophiolite, located at the middle section of the Beishan area,is one of the well exposed ophiolitic belts in the Beishan area. The pillow basalt and cumulate gabbro are characterized by depletion of LREE, flat distribution pattern, and(La/Yb)N = 0. 47-- 1. 62, similar to those of N-MORB; and by enrichment of LILEs, and depletion of HFSEs such as Nb and Ta, different from those of N-MORB, but similar to those by typical island-arc volcanic rocks, I. e. the mafic rocks have both the MORB-like and arc-like geochemical features. These features are similar to those of mafic rocks occurring in the Kuerti ophiolite which formed in the back-arc basin. Their geochemical features reflect a tectonic setting of back arc basin in which volcanic rock formed. The End(t) of other samples are positive and high (6. 11 --8. 17),which implies that the source area is the depleted mantle. Combined with the geochemical and sedimentary characteristics, it can be concluded that the Yueyashan-Xichangjing ophiolite may form in a back-arc basin, which, along with Xieshan-Dongqiyi volcanic arc in the north of the basin, constituted an "arc-basin" system in the Tarim plate.关键词
北山地区/蛇绿岩/弧后盆地/塔里木板块Key words
Bei Shan area/ophiolite/Back-arc basin/Tarim plate/Kazakhstan plate引用本文复制引用
郑荣国,吴泰然,张文,冯继承..北山地区月牙山-洗肠井蛇绿岩的地球化学特征及形成环境[J].地质学报,2012,86(6):961-971,11.基金项目
本文为国家自然科学基金(编号41040017)资助的成果. （编号41040017）
