内蒙古苏尼特左旗白音乌拉北部白音高老组时代重新厘定——来自LA-ICP-MS锆石U-Pb年龄的证据  

Redetermination of the age of Baiyingaolao Formation in Sonid Left Banner, Inner-Mongolia: Evidence from LA-ICP-MS U-Pb dating of zircons

作　　者：肖中军[1] 王振强[1] 吴煜[1] 吕达鑫 田强国[1] 王建统[1] 徐建昌[1] 

机构地区：[1]河南省地质矿产勘查开发局第一地质矿产调查院,河南洛阳471023

出　　处：《地质通报》2015年第9期1706-1714,共9页Geological Bulletin of China

基　　金：中国地质调查局项目(编号:1212011220452)

摘　　要：内蒙古苏尼特左旗北部出露一套灰白色流纹质火山岩,前人根据岩性组合将其归入上侏罗统白音高老组。在这套火山岩中获得了4个LA-ICP-MS锆石U-Pb年龄,分别为305.1±1.1Ma、304.5±1.1Ma、305.7±1.9Ma、303.6±1.1Ma,将其划归为上石炭统宝力高庙组,这对研究区的地层划分及确定岩浆演化具有指导性意义。There exists a suite of gray rhyolitic rocks in Sonid Left Banner of Inner-Mongolia. According to the petrological features, these volcanic rocks are considered to be a part of Upper Cretaceous Baiyingaolao Formation. With the LA-ICP-MS dating analysis, however, the authors obtained four U-Pb ages, i.e., 305.1 ± 1.1Ma, 304.5± 1.1Ma, 305.7 ± 1.9Ma, and 303.6±1.1Ma, indicating that they belong to the Upper Carboniferous Baoligaomiao Formation. The result achieved by the authors has guiding significance for stratigraphic division and determination of magma evolution.

关 键 词：白音高老组 火山岩 宝力高庙组 LA-ICP-MS锆石U-PB年龄 

分 类 号：P597.3[天文地球—地球化学]