文献类型： 外文期刊

第一作者： Zhao, GC

作者： Zhao, GC;Hu, JM;Meng, QR

作者机构：

关键词： basic sills;underplating;extension;Wudang block;Qinling orogen

期刊名称：ACTA PETROLOGICA SINICA （ 影响因子：1.41； 五年影响因子：1.811 ）

ISSN： 1000-0569

年卷期： 2003 年 19 卷 4 期

页码：

收录情况： SCI

摘要： There are a lot of the Paleozoic basic sills in the western Wudang terrain in south Qinling structural zone. The study on petrology, geochemistry and isotopic composition of Sr and Nd in this paper shows that the magma of the basic sills belongs to the tholeiite series and is from a mixed and abnormal continental lithospheric mantal-type magma resource. The basic sill swarm is one of the marks of the rifting of Wudang terrain and the middle Paleozoic underplating of mantal magma and interplayting between the mantal and crust. In addition to it, the geochemistry of basic sills is very similar to that of the tholeiite and meta-diabases in Mianlue ophiolite. Considering the differences in isotopic age of the basic sills (401similar to407 Ma), the extension of Wudang terrain (425similar to260 Ma) and the basic volcanic rocks in Mianlue suitural zone (230 Ma), the authors believe that the basic sills in the western Wudang terrain are the result from the extension and the thinning of the continental lithosphere caused by the activation of the mantal plume, and upwelling of the deep magma. So the basic sills should be a response of the early stage of opening of the Mianlue ocean.

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