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西准噶尔地区洋陆转换时代:来自锆石U-Pb定年与Lu-Hf同位素的约束

徐盛林, 陈宣华, 李廷栋, 丁伟翠, 史建杰, 李冰, 马飞宙. 2019. 西准噶尔地区洋陆转换时代:来自锆石U-Pb定年与Lu-Hf同位素的约束[J]. 中国地质, 46(5): 1061-1078. doi: 10.12029/gc20190508
引用本文: 徐盛林, 陈宣华, 李廷栋, 丁伟翠, 史建杰, 李冰, 马飞宙. 2019. 西准噶尔地区洋陆转换时代:来自锆石U-Pb定年与Lu-Hf同位素的约束[J]. 中国地质, 46(5): 1061-1078. doi: 10.12029/gc20190508
XU Shenglin, CHEN Xuanhua, LI Tingdong, DING Weicui, SHI Jianjie, LI Bing, MA Feizhou. 2019. Time of the ocean-continent transition in West Junggar: Constraints from zircon U-Pb dating and Lu-Hf isotopic composition[J]. Geology in China, 46(5): 1061-1078. doi: 10.12029/gc20190508
Citation: XU Shenglin, CHEN Xuanhua, LI Tingdong, DING Weicui, SHI Jianjie, LI Bing, MA Feizhou. 2019. Time of the ocean-continent transition in West Junggar: Constraints from zircon U-Pb dating and Lu-Hf isotopic composition[J]. Geology in China, 46(5): 1061-1078. doi: 10.12029/gc20190508

西准噶尔地区洋陆转换时代:来自锆石U-Pb定年与Lu-Hf同位素的约束

  • 基金项目:
    中国地质调查局地质调查项目(DD20160083、DD20190011、DD20160344-05)、中央级公益性科研院所基本科研业务费项目(CAGS-YWF201706)和国家重点研发计划项目(2018YFC0603700)联合资助
详细信息
    作者简介: 徐盛林, 男, 1991年生, 博士, 构造地质学专业, 从事构造地质学、岩石地球化学研究工作; E-mail:xushenglindizhi@163.com
    通讯作者: 陈宣华, 男, 1967年生, 研究员, 博士生导师, 主要从事深地探测研究; E-mail:xhchen@cags.ac.cn
  • 中图分类号: P597;P542

Time of the ocean-continent transition in West Junggar: Constraints from zircon U-Pb dating and Lu-Hf isotopic composition

  • Fund Project: Supported by China Geological Survey Program(No. DD20160083, DD20160344-05 and DD20190011), Fundamental Research Funds for Central Public Welfare Research Institutes (No. CAGS-YWF201706) and National Key Research and Development Program of China (No. 2018YFC0603701)
More Information
    Author Bio: XU Shenglin, male, born in 1991, doctor, majors in structural geology, engages in research on tectonics and geochemistry; E-mail: xushenglindizhi@163.com .
    Corresponding author: CHEN Xuanhua, male, born in 1967, professor, supervisor of doctor candidates, engages in deep earth exploration; E-mail: xhchen@cags.ac.cn
  • 中亚造山带西部的西准噶尔地区是古生代洋陆构造转换最显著的地区之一,但是关于该地区洋陆转换的具体时间和地壳演化至今仍存在诸多争议。本文以西准噶尔地区的庙尔沟岩体及其西北侧新发现的柱状节理流纹岩为研究对象,通过锆石U-Pb定年的方法,判断庙尔沟岩体的年龄为302.8~308.8 Ma,柱状节理流纹岩的年龄为303.6~294.5 Ma。锆石Lu-Hf同位素测试结果显示,庙尔沟岩体和柱状节理流纹岩都具有相似的高176Hf/177Hf值和高正εHft)值,具有亏损地幔的源区属性,可能来源于下地壳底部残余洋壳或火山岛弧等新生地壳发生部分熔融。结合区域地质资料和前人研究成果,将西准噶尔地区由大洋俯冲向陆内环境转变的时间限定为晚石炭-早二叠世,其基底可能是以新元古代晚期-晚古生代形成的年轻洋壳和岛弧为主,不存在古老的结晶基底。

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  • 图 1  西准噶尔地区地质构造与采样位置图

    Figure 1. 

    图 2  庙尔沟岩体与柱状节理流纹岩野外产出特征

    Figure 2. 

    图 3  庙尔沟花岗岩和流纹岩锆石CL图像

    Figure 3. 

    图 4  庙尔沟花岗岩类和流纹岩U-Pb测年谐和图

    Figure 4. 

    图 5  庙尔沟花岗岩类与流纹岩锆石Hf同位素特征

    Figure 5. 

    图 6  西准噶尔晚石炭—早二叠世构造背景模式图

    Figure 6. 

    图 7  二阶模式年龄(Ma)分布图解

    Figure 7. 

    表 1  庙尔沟花岗岩类与流纹岩LA-MC-ICP-MS U-Pb同位素分析结果

    Table 1.  LA-ICP-MS U-Pb isotopic data of Miaoergou granitoids and rhyolites

    下载: 导出CSV

    表 2  庙尔沟花岗岩类与流纹岩Lu-Hf同位素分析结果

    Table 2.  Lu-Hf isotopeic analytical results of Miaoergou granitoids and rhyolites

    下载: 导出CSV
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出版历程
收稿日期:  2019-04-18
修回日期:  2019-08-26
刊出日期:  2019-10-25

目录