Discovery and its tectonic significance of the ophiolite in the south of Xiemisitai Mountain,West Junggar,Xinjiang
Discovery and its tectonic significance of the ophiolite in the south of Xiemisitai Mountain,West Junggar,Xinjiang
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发表时间：
2013
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通讯作者：
Zhu Ya-bing
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作者：
Zhu Ya-bing
查干陶勒盖蛇绿岩发现于新疆西准噶尔谢米斯台山南麓、和什托洛盖河谷以北。蛇绿岩为一条长约18 km、走向北东向的蛇纹质杂岩体，包体为蛇纹化橄榄岩、辉长岩、玄武岩、细碧岩、硅质岩块及同源火山碎屑岩。查干陶勒盖蛇绿岩中辉长岩的LA-ICP-MS锆石U-Pb年龄分别为517 Ma ± 3 Ma和519 Ma ± 3 Ma。稀土配分模式、微量元素变化图和Nb/Yb-Th/Yb图解显示了洋中脊蛇绿岩的地球化学特征。查干陶勒盖蛇绿岩与西准噶尔北方的塔尔巴加台（库吉拜）蛇绿岩、红古勒楞蛇绿岩和东哈萨克斯坦北方的兆尔蛇绿岩、巴克贝克蛇绿岩可较好地对比，从而为成吉思-塔尔巴加台带的时空特征提供了更多的制约。
Chagantaolegai ophiolite was discovered from the south of Xiemisitai Mountain,north to Heshituoluogai valley in West Junggar,Xinjiang.The ophiolite is represented by a ca.18km long,north-northeast-striking serpentinite-matrix melange,which encloses serpentinized peridotite,gabbro,basalt,spilite,chert blocks and homologous pyroclastic rocks.The LA-ICP-MS zircon U-Pb datings of gabbro in Chagantaolegai ophiolite are 517Ma±3Ma and 519Ma±3Ma,suggesting Early-Middle Cambrian.The REE patterns, trace element variation diagram and Nb/Yb-Th/Yb diagram show geochemical characteristics of Mid-ocean ridge ophiolite. Chagantaolegai ophiolite could be correlated well with Tarbagatai(Kujibai) ophiolite,Hongguleleng ophiolite in northern part of West Junggar and Zhaur ophiolite,Barkbek ophiolite in northern part of East Kazakhstan,thus providing more constraints for spatiotemporal characteristics of Chingiz-Tarbagatai Belt.