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首页> 外文期刊>Journal of Asian earth sciences >Geochemistry of the Mian-Lue ophiolites in the Qinling Mountains, central China: Constraints on the evolution of the Qinling orogenic belt and collision of the North and South China Cratons
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Geochemistry of the Mian-Lue ophiolites in the Qinling Mountains, central China: Constraints on the evolution of the Qinling orogenic belt and collision of the North and South China Cratons

机译：中国中部秦岭绵芦蛇绿岩的地球化学：秦岭造山带的演化以及华北和华南克拉通的碰撞的制约

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摘要

The Anzishan ophiolite, a typical ophiolitic block of early Carboniferous age in the Mian-Lue suture zone of the Qinling Mountains, central China, consists of amphibolites/metabasalts, gabbros and gabbroic cumulates. All of these rocks, as well as those in the Hun-shuiguan-Zhuangke (HZ) block, have compositions similar to normal MORB and back-arc basin basalts (BABB) with high eNd(t) values, indicating that they were derived from a depleted mantle source. The Mian-Lue suture zone also contains blocks of other lithologies, e.g., rift volcanic rocks in the Heigouxia block and arc volcanic rocks in the Sanchazi block. Although they are in fault contact with each other, the presence of these different blocks in the Mian-Lue suture zone may represent a complete Wilson cycle, from initial rifting to open ocean basin to final subduction and continent-continent collision, during the late Paleozoic-early Triassic. In this region, the North and South China Cratons were separated by Paleo-Tethys at least until the early Carboniferous, and final amalgamation of both cratons along the Qinling orogenic belt took place in the Triassic.
机译：安子山蛇绿岩是中国中部秦岭棉线缝合带石炭纪早期的典型蛇纹岩块，由闪石/变玄武岩，辉长岩和辉长岩堆积物组成。所有这些岩石，以及浑水关-庄克（HZ）块体中的岩石，都具有与正常MORB和后弧盆地玄武岩（BABB）相似的成分，具有很高的eNd（t）值，表明它们源自地幔资源枯竭。棉绒线缝合带还包含其他岩性块体，例如黑沟峡块体中的裂谷火山岩和桑查齐块体中的弧形火山岩。尽管它们相互之间是断层接触，但在绵古缝合线带中这些不同的块体的存在可能代表了一个完整的威尔逊循环，从初始裂谷到开阔海盆到最后的俯冲和大陆-大陆碰撞，都在古生代晚期。 -早期三叠纪。在这个地区，华北和南克拉通至少在古石炭纪之前就已被古特提斯分隔开，三叠纪沿秦岭造山带将两个克拉通最终合并。

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