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黄金科学技术 ›› 2017, Vol. 25 ›› Issue (6): 9-20.doi: 10.11872/j.issn.1005-2518.2017.06.009

• 矿产勘查与资源评价 • 上一篇    下一篇

川西甘孜—理塘缝合带中段存在奥陶纪外来岩块的证据:碎屑锆石U-Pb年龄

郭云成1,3,刘家军1,2*,毛世东3,李虎 1,3   

  1. 1.中国地质大学(北京)地球科学与资源学院,北京   100083;
    2.中国地质大学地质过程与矿产资源国家重点实验室,北京   100083;
    3.武警黄金第十二支队,四川  成都   611732
  • 收稿日期:2017-04-14 修回日期:2017-08-31 出版日期:2017-12-30 发布日期:2018-05-18
  • 通讯作者: 刘家军(1963-),男,湖北仙桃人,教授,从事矿床学和矿床地球化学研究工作。liujiajun@cugb.edu.cn
  • 作者简介:郭云成(1990-),男,山东滨州人,硕士研究生,从事矿床地球化学研究工作。836648647@qq.com
  • 基金资助:

    边区域地质矿产调查”(编号:12120113071700)和国家自然科学基金重点项目“秦岭成矿域复合造山过程中印支—燕山期金—多金属成矿作用”(编号:41730426)联合资助

Paleozoic Terrane Was Found in the Middle Part of the Ganzi-Litang Suture Zone,West Sichuan: Evidences from the Detrital Zircon Geochronology

GUO Yuncheng 1,3,LIU Jiajun 1,2,MAO Shidong 3,LI Hu 1,3   

  1. 1.School of Earth Sciences and Resources,China University of Geosciences,Beijing   100083,China;
    2.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China;
    3.No.12 Gold Geological Party of CAPF, Chengdu   611732,Sichuan,China
  • Received:2017-04-14 Revised:2017-08-31 Online:2017-12-30 Published:2018-05-18

摘要:

甘孜—理塘缝合带内变质石英砂岩普遍经历低级变质,野外工作中未发现化石标本,岩石组合特征和地层序列表明其沉积环境为滨浅海。选取川西理塘县城北的缝合带内变质石英砂岩作为研究对象,测定砂岩内单颗粒碎屑锆石U-Pb年龄分布范围为3 264~495 Ma,峰值主要集中在544~495 Ma,1 000~730 Ma,1 220~1 050 Ma,1 563~1 367 Ma,1 761~1 648 Ma,并且存在少量2 514 Ma(1颗)和3 264~3 220 Ma(2颗)的太古宙古老年龄锆石。对比相邻区域地层组合和碎屑锆石直方图特征,限定地层形成的时代为奥陶纪,初步判断其物质成分来源于扬子西缘和西藏地区,表明甘孜—理塘缝合带中存在构造成因的古生代外来岩块。

关键词: 碎屑锆石, U-Pb年龄, 沉积环境, 构造成因, 甘孜—理塘缝合带, 构造演化

Abstract:

 The metamorphic quartz sandstones in the Ganzi-Litang suture zone experience low grade of metamorphism,no fossil samples were found during the field work.The sedimentary succession was deposited on the coastal and shallow sea environments.Ages of detrital zircons from the metamorphic quartz sandstones have a population ranging mainly from 3 264 to 495 Ma,yield five U-Pb age clusters of 544~495 Ma,1 000~730 Ma,1 220~1 050 Ma,1 563~1 367 Ma and 1 761~1 648 Ma,beside three old Archean zircon grains,therefore,the rocks have maximum depositional ages of 495 Ma.Compared with the detrital zircons histogram feature and stratigraphic assemblage characteristics from adjacent regions,the data suggests that the zircon grains have very complicated sources,but mainly from the western margin of the Yangtze Block.

Key words: Key words, detrial zircon, U-Pb geochronology, sedimentary succession, structural cause, Ganzi-Litang suture zone, tectonic evolution

中图分类号: 

  • P597

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