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新疆额尔其斯缝合带南侧科克森套蛇绿岩的时代及其意义

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倪康, 雷永孝, 胡秀军, 陈文革. 新疆额尔其斯缝合带南侧科克森套蛇绿岩的时代及其意义[J]. 西北地质, 2013, 46(3): 64-69.
引用本文: 倪康, 雷永孝, 胡秀军, 陈文革. 新疆额尔其斯缝合带南侧科克森套蛇绿岩的时代及其意义[J]. 西北地质, 2013, 46(3): 64-69.
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NI Kang, LEI Yong-xiao, HU Xiu-jun, CHEN Wen-ge. Zircon U-Pb Age and Its Implications of the Kekesentao Ophiolite in the south of the Erqis Suture Zone in Xinjiang[J]. Northwestern Geology, 2013, 46(3): 64-69.
Citation: NI Kang, LEI Yong-xiao, HU Xiu-jun, CHEN Wen-ge. Zircon U-Pb Age and Its Implications of the Kekesentao Ophiolite in the south of the Erqis Suture Zone in Xinjiang[J]. Northwestern Geology, 2013, 46(3): 64-69.
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新疆额尔其斯缝合带南侧科克森套蛇绿岩的时代及其意义

  • 1.

    福建省地质矿产局闽西地质大队, 福建 厦门 361000

  • 2.

    西安地质矿产研究所, 陕西 西安 710054

  • 3.

    新疆地质矿产局第三地质大队, 新疆 库尔勒 841000

  • 基金项目: 国家305项目"阿尔泰重要成矿带成矿动力学背景和成矿过程研究"(1212011220894)部分成果

Zircon U-Pb Age and Its Implications of the Kekesentao Ophiolite in the south of the Erqis Suture Zone in Xinjiang

  • 1.

    Minxi Geology Team of the Fujian Bureau of Geology and Mineral Resources, Xiamen 361000, China

  • 2.

    Xi'an Institute of Geology and Mineral Resources, Xi'an 710054, China

  • 3.

    No.3 Geology Team of the Xinjiang Bureau of Geology and Mineral Resources, Kerle 841000, China

    摘要
  • 位于阿勒泰布尔津县南侧的科克森套蛇绿岩以构造接触的方式产于中泥盆统蕴都卡拉组中,主要由蛇纹石化纯橄岩、橄榄辉长岩及辉长岩组成。通过对辉长岩中锆石LA-ICPMS U-Pb测年,获得西岩体及东岩体的年龄分别为(332.1±1.5 Ma)和(336.5±1.3 Ma),二者在误差范围内一致,表明科克森套蛇绿岩形成于石炭纪早期。通过区域地质分析,认为该蛇绿岩是亲哈萨克斯坦地体与阿勒泰-蒙古地体在石炭纪中晚期发生拼合时的洋壳残余。
    The Kekesentao ophiolite outcrops in the south of the Erqis suture zone and tectonically mixed in the MidAltai;Kekesentao ophiolite;age;tectonic implicationsDevonian Yundoukala Formation. Main rocks of the ophiolite include serpentinized dunite, olivineAltai;Kekesentao ophiolite;age;tectonic implicationsgabbro and gabbro. In this study, we obtained zircon LAAltai;Kekesentao ophiolite;age;tectonic implicationsICPMS UAltai;Kekesentao ophiolite;age;tectonic implicationsPb age of the gabbros from this ophiolite. Zircons from western and eastern pluton yield concordant age of 332.1±1.5 Ma and 336.5±1.3 Ma respectively, indicating that both of them were coevally emplaced and the ophiolite was formed in early Carboniferous. Combining with the ages obtained in this study and the regional geology, we suggest that the Kekesentao ophiolite was the residue of the oceanic crust between the Kazakstan plate and the AltaiAltai;Kekesentao ophiolite;age;tectonic implicationsMongolia Terrane during their amalgamation at middle to late Carboniferous.
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