第42卷第4期 2015年8月
中国地质 GEOLOGYINCHINA
Vol.42, No.4 Aug.,2015
武跃勇，期文信，邵永旭，等.内蒙古查干敖包地区上石炭一下二叠统宝力高庙组特征及时代[].中国地质，2015,42(4)：937-947.
Wu Yueyong, Ju Wenxin, Shao Yongxu, et al, Stratigraphic division and age of Upper Carboniferous Lower Permian Baoligaomiao Formation in Qagan Obo area, SonidLeft Banner, Inner Mongolia[J]. Geology in China, 2015, 42(4): 937947(in Chinese with English abstract)
内蒙古查干敖包地区上石炭
下二叠统宝力高庙组特征及时代
武跃勇翰文信邵永旭姜海蛟（内蒙古自治区地质调查院，内蒙古呼和浩特010020）
提要：笔者在查干数包地区开展1：5万区域地质调查工作时，发现本区出露的宝力高庙组层序齐全、植物化石丰富、划分标志明显，通过路线调查、剖面测量对其进行了重新划分，即据岩性组合、生物面貌等特征划分为4个岩性段，一段为河湖相灰色、灰绿色碎屑岩夹少量中性火山岩，在粉砂岩中采到了大量安格拉植物化石；二段为中偏碱性-酸性砖红色、紫色火山岩夹砂(砾)岩，其中粗面岩获得结石U-Pb同位素年龄为(297.0±1.2)Ma；三段为灰色、灰紫色安山质火山岩夹碎屑；四段以灰白色流纹质火山岩为特征，夹砂岩、泥灰岩等，在砂岩中采到了大量安格拉植物群化
石。据植物化石鉴定结果、同位素年龄资料将其形成时代确定为晚石炭一早二叠世。关键词：苏尼特左旗；查干敖包地区；宝力高庙组安格拉植物化石；同位素年龄
中图分类号：P534.45~46
文献标志码：A
文章编号：1000-3657(2015)04-0937-11
Stratigraphic division and age of Upper Carboniferous -LowerPermian BaoligaomiaoFormationinQaganOboarea,SonidLeftBanner,InnerMongolia
WUYue-yong,JUWen-xin,SHAOYong-xu,JIANGHai-jiac(Geological Survey Institute of Inner Mongolia, Hohhor 010020, Inner Mongolia, China)
Abstract: During the 1:50 000 regional geological survey in Qagan Obo area, the authors found that the sequence of Baoligaomiao Formation exposed in Qagan Obo area is complete, and the strata have abundant plant fossils and clear division marks eaaaeeaseaeee the lithological and biological appearance. The first member is lacustrine and gray, grayish green clastic rocks with a little mild volcanic rock, and there are a large number of Angela plant fossils in the siltstones; the second member is alkalineacidic brick red rock intercalated with purple volcanics with sand (gravel) rock, and the UPb dating of zircon from the trachyte and rhyodacite yielded ages of (297.0±1.2)Ma and (323.0±1.4)Ma; the third member is gray and purple gray andesitic volcanics with clastic rock; the fourth member is gray rhyolitic volcanic rocks with sandstone and marl, and the sandstone also has a large number of Angela plant
收稿日期：2014—12—23：改回日期：2015—04—01
基金项目：中国地质调查局项目"内蒙古15万巴润布拉格（L49E022016）、萨音呼都格（L49E022017)、查于效包庙（L49E023015）、吕特
数包（L49E023016）、反修牧场（L49E023017)区测"（1212011120715）资助。
作者简介：武跃勇，男，1959年生，地质矿产高级工程师，长期以来一直从事区域地质调查工作；E-mail：350495661qq.com。
http://geochina.cgs-gov.cn中国地质,2015,42(4)