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侵入梵净山群白岗岩锆石U-Pb年龄及白岗岩底砾岩对下江群沉积的制约
引用本文:高林志 戴传固 丁孝忠 王,敏 刘燕学 王雪华 陈建书.侵入梵净山群白岗岩锆石U-Pb年龄及白岗岩底砾岩对下江群沉积的制约[J].中国地质,2011,38(6):1413-1420.
作者姓名:高林志 戴传固 丁孝忠 王  敏 刘燕学 王雪华 陈建书
作者单位:中国地质科学院地质研究所;贵州地矿局地质调查院
基金项目:中国地质调查局地质大调查项目(121201011120131);科技基础性工作专项(2011FY120100)资助
摘    要:下江群代表了新元古代末期的新裂谷沉积的起点,确定下江群的时代对新元古代构造运动有着重要的地质意义。贵州印江县地区有一套新元古代白岗岩侵入到梵净山群并被下江群覆盖,在下江群底砾岩中发现大量未经搬运的白岗岩底砾岩砾石。因此,笔者对梵净山地区的白岗岩进行锆石U-Pb年代测定,获得锆石U-Pb年龄(835±5)Ma。该年龄对下江群沉积启动时间和下覆梵净山群的沉积上限均有时代的制约。结合下江群甲路组斑脱岩锆石U-Pb年龄(814±6 Ma)和考虑到武陵运动的年限,下江群沉积年代不应老于白岗岩底砾岩的年代和武陵运动的界面。

关 键 词:梵净山群  白岗岩  下江群  武陵运动  SHRIM  PU-Pb

SHRIMP U-Pb dating of intrusive alaskite in the Fanjigshan Group and alaskite basal conglomerates: constraints on the deposition of the Xiajiang Group
GAO Lin-zhi,DAI Chuan-gu,DING Xiao-zhong,WANG Min,LIU Yan-xue,WANG Xue-hu,CHEN Jian-shu.SHRIMP U-Pb dating of intrusive alaskite in the Fanjigshan Group and alaskite basal conglomerates: constraints on the deposition of the Xiajiang Group[J].Chinese Geology,2011,38(6):1413-1420.
Authors:GAO Lin-zhi  DAI Chuan-gu  DING Xiao-zhong  WANG Min  LIU Yan-xue  WANG Xue-hu  CHEN Jian-shu
Institution:1.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;2.Institute of Geological Survey,Guizhou Bureau of Geology and Mineral Resources,Guiyang 550005,Guizhou,China)
Abstract:The deposition of the Xiajiang Group represents a new rift in late Neoproterozoic.The determination of the age of the Xiajiang Group is of great importance for the study of the Neoproterozoic tectonic movement.A suite of Neoproterozoic alaskite intruded into the Fanjiangshan Group and was covered by the Xiajiang Group,which developed large quantities of alaskite basal conglomerate.However,the alaskite zircon U-Pb age of 835±5 Ma will constrain the starting time of the deposition of the Xiajiang Group and the upper limit of the deposition of Fanjiangshan Group.Combined with the bentonite zircon U-Pb age of 814±6 Ma of the Jialu Formation in Xiajiang Group and considering the age of the Wuling Movement,the authors hold that the deposition age of the Xiajiang Group is not older than the age of the alaskite basal conglomerates.
Keywords:Fanjingshan Group  Alaskite  Xiajiang Group  Wuling Movement  SHRIMP U-Pb
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