| 祁连造山带东段中寒武世深沟组中-基性火山岩锆石U-Pb年龄、地球化学特征及构造环境 |
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| 引用本文： | 李瑞保,裴先治,王兴,陈有炘,李佐臣,刘成军,王盟,裴磊,张玉,颜全治,彭思钟,胡晨光.祁连造山带东段中寒武世深沟组中-基性火山岩锆石U-Pb年龄、地球化学特征及构造环境[J].地质通报,2018,37(4):589-603. |
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| 作者姓名： | 李瑞保 裴先治 王兴 陈有炘 李佐臣 刘成军 王盟 裴磊 张玉 颜全治 彭思钟 胡晨光 |
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| 作者单位： | 长安大学地球科学与资源学院;西部矿产资源与地质工程教育部重点实验室 |
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| 基金项目： | 中国地质调查局项目《祁连成矿带肃南—大柴旦地区地质矿产调查》（编号：DD20160012）、《青海省循化县道帏地区1∶5万I48E002003、I48E003003两幅区域地质矿产调查》（编号：12120114018219）、《青海省共和县曲什那地区1∶5万J47E021017、J47E021018、J47E022018三幅区域地质矿产调查》（编号：12120114041201）和国家自然科学基金项目《东昆仑东段晚古生代—早中生代构造演化与造山过程研究》（批准号：41472191）、《东昆仑东段东昆中蛇绿岩年代学及构造属性研究》（批准号：41502191） |
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| 摘 要： | 拉脊山构造带南东端磨沟地区出露一套变安山岩夹片理化变玄武岩组合,其原岩分别为亚碱性拉斑系列安山岩和玄武岩。研究表明,变安山岩锆石U-Pb年龄为503.1±6.6Ma,形成于中寒武世。玄武岩稀土元素总量为93.40×10~(-6)～135.39×10~(-6),(La/Yb)_N值为2.76～3.64,δEu为0.87～1.00,微量元素蛛网图具有不相容元素富集特征,没有明显的Nb、Ta负异常,与板内火山岩特征相似。安山岩稀土元素总量低于玄武岩,而微量元素蛛网图具有富集大离子亲石元素Cs、Rb、Ba等,亏损高场强元素Nb、Ta、Ti等特征。岩石成因研究表明,玄武岩没有经历显著的地壳混染,为软流圈地幔石榴子石+尖晶石二辉橄榄岩低程度部分熔融的产物,而安山岩为地壳部分熔融的产物。构造环境判别表明,深沟组火山岩形成于大陆裂谷环境,表明祁连地块中部的拉脊山构造带南东端可能没有发育成熟的洋盆系统,随后在南祁连洋早古生代俯冲消减过程中以裂谷型岩石圈碎片的方式构造侵位于中祁连地块南缘。
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| 关 键 词： | 祁连造山带 拉脊山构造带 玄武岩 深沟组 大陆裂谷 |
| 收稿时间： | 2017/7/7 0:00:00 |
| 修稿时间： | 2018/3/2 0:00:00 |
Zircon U-Pb dating, geochemical characteristics and tectonic setting of intermediate-basic volcanic rocks from Middle Cambrian Shen-gou Formation, eastern Qilian orogen |
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| LI Ruibao,PEI Xianzhi,WANG Xing,CHEN Youxin,LI Zuochen,LIU Chengjun,WANG Meng,PEI Lei,ZHANG Yu,YAN Quanzhi,PENG Sizhong and HU Chenguang.Zircon U-Pb dating, geochemical characteristics and tectonic setting of intermediate-basic volcanic rocks from Middle Cambrian Shen-gou Formation, eastern Qilian orogen[J].Geologcal Bulletin OF China,2018,37(4):589-603. |
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| Authors: | LI Ruibao PEI Xianzhi WANG Xing CHEN Youxin LI Zuochen LIU Chengjun WANG Meng PEI Lei ZHANG Yu YAN Quanzhi PENG Sizhong and HU Chenguang |
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| Institution: | School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China;Key Laboratory of Western Mineral Resource and Geological Engineering of Ministry of Education, Xi''an 710054, Shaanxi, China,School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China;Key Laboratory of Western Mineral Resource and Geological Engineering of Ministry of Education, Xi''an 710054, Shaanxi, China,School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China,School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China;Key Laboratory of Western Mineral Resource and Geological Engineering of Ministry of Education, Xi''an 710054, Shaanxi, China,School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China;Key Laboratory of Western Mineral Resource and Geological Engineering of Ministry of Education, Xi''an 710054, Shaanxi, China,School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China;Key Laboratory of Western Mineral Resource and Geological Engineering of Ministry of Education, Xi''an 710054, Shaanxi, China,School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China;Key Laboratory of Western Mineral Resource and Geological Engineering of Ministry of Education, Xi''an 710054, Shaanxi, China,School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China,School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China,School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China,School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China and School of Earth Science and Resource, Chang''an University, Xi''an 710054, Shaanxi, China |
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| Abstract: | |
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| Keywords: | Qilian orogen Lajishan mélange basalt Shengou Formation continental rift |
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