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东秦岭商丹地区武关岩群变沉积岩碎屑锆石U-Pb年龄及其地质意义
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  • 英文篇名:Detrial Zircon U-Pb Ages and Geological Significances of Meta-Sedimentary Rocks from Wuguan Group in the Shangdan Area of East Qinling
  • 作者:李宗耀 ; 裴先治 ; 李瑞保 ; 李佐臣 ; 裴磊 ; 刘成军 ; 陈有炘 ; 王盟 ; 高峰
  • 英文作者:LI Zongyao;PEI Xianzhi;LI Ruibao;LI Zuochen;PEI Lei;LIU Chengjun;CHEN Youxin;WANGMeng;GAO Feng;School of Earth Science and Resources,Chang'an University;Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits,MLR;School of Earth Sciences and Resources,China University of Geosciences;
  • 关键词:武关岩群 ; 变质沉积岩 ; 碎屑锆石 ; LA-ICP-MS锆石U-Pb年龄 ; 沉积物源
  • 英文关键词:Wuguan Group;;meta-sedimentary rock;;detrital zircon;;LA-ICP-MS zircon U-Pb ages;;sedimentary sources
  • 中文刊名:XBDI
  • 英文刊名:Northwestern Geology
  • 机构:长安大学地球科学与资源学院;长安大学国土资源部岩浆作用成矿与找矿重点实验室;中国地质大学地球科学与资源学院;
  • 出版日期:2017-03-05
  • 出版单位:西北地质
  • 年:2017
  • 期:v.50;No.203
  • 基金: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”(41472191)、“东昆仑东段东昆中蛇绿岩年代学及构造属性研究”(41502191)、“东昆仑南缘布青山构造混杂岩带的组成、结构与构造演化过程”(41172186)、“西秦岭北缘变形构造解析及其祁连-秦岭构造交接关系研究”(40972136)、“扬子地块西北缘后龙门东段变质核杂岩形成机制和区域构造背景”(40572121)资助
  • 语种:中文;
  • 页:XBDI201701015
  • 页数:14
  • CN:01
  • ISSN:61-1149/P
  • 分类号:155-168
摘要
笔者以东秦岭商丹地区武关岩群毛坪长英质片岩单元中黑云石英片岩为研究对象,进行碎屑锆石LA-ICP-MS U-Pb年代学研究,探讨其沉积时代及物质来源。结果显示,碎屑锆石年龄可以划分为4个年龄谱段:早古生代年龄谱段416.8~590.5Ma,峰值为449Ma;新元古代年龄谱段731.5~1055.8Ma,峰值为830Ma;中元古代—古元古代年龄谱段1606.9~1 816.9Ma,峰值为1804Ma;古元古代—新太古代年龄谱段2434.6~2690.3Ma,峰值为2 687Ma。综合研究认为,武关岩群毛坪长英质片岩单元的沉积岩形成时代不早于420Ma,形成于顶志留世商丹洋闭合阶段,是构造混杂并卷入原有的裂谷型火山-沉积岩系之中的时代较新的沉积地层,其碎屑物质可能由北秦岭构造带和南秦岭构造带共同提供。
        The biotite quartz schist from the Maoping felsic schist unit in Wuguan Group of ShangnanDanfeng tectonic belt has been selected as research object in this paper,which has been studied by usingLA-ICP-MS zircon U-Pb isotope chronology to discuss the sedimentary age and material source of this schist.The results show that the detrital zircon ages can be divided into 4 age spectrums:Early Paleozoic-Early Simian age spectrum ranges from 416.8Ma to 590.5Ma,with a peak of 449Ma;Neoproterozoic age spectrum varies from 731.5Ma to 1055.8Ma,peaking in 830Ma;Mesoproterozoic-Early Proterozoicage spectrum changes from 1 606.9Ma to 1 816.9Ma,with a peak of 1 804Ma;Proterozoic-Archen age spectrum are 2 434.6 ~2 690.3Ma,peaking in 2 687 Ma.The comprehensive study suggests that,the formation time of Maoping felsic schist unit from Wuguan Group is notolder than 420 Ma,which was formed in the closure stage of formed in Shangdan ocean in Silurian and served as tectonic melange and new sedimentary formation involved in the original rifted volcanic-sedimentary rocks,while the detritus source would be provided from both north and south Qinling structural belts.
引文
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