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ID:46280234
大小:1.49 MB
页数:11页
时间:2019-11-22
《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》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第42卷第4期中国地质、,01.42.No.42015年8月GEOLOGYINCHINAAug.,2015武跃勇,鞠文信,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[J].中国地质,2015,42(4):937—947.WuYueyong,JuWenxin,ShaoYongxu,eta1.StratigraphicdivisionandageofUpperCarboniferous—LowerPermianBaoligaomiaoFormationinQaganOboarea,SonidLeftBanner,InnerMongolia[J].GeologyinC
2、hina,2015,42(4):937—947(inChinesewithEnglishabstracO.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武跃勇鞠文信邵永旭姜海蛟(内蒙古自治区地质调查院,内蒙古呼和浩特010020)提要:笔者在查干敖包地区开展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;二段为中偏碱性一酸肚砖红色、紫色火山岩夹砂(砾)岩,其中粗面岩获
3、得锆石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—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—11StratigraphicdivisionandageofUpperCarboniferous。——LowerPermianBaoligaomiaoFormation
4、inQaganOboarea,SonidLeftBanner,InnerMongoliaWUYue—yong,JUWen—xin,SHAOYong—XU,JIANGHai-jiao(GeologicalSurveyInstituteofInnerMongolia,Hohhot010020,InnerMongolia,China)Abstract:Duringthe1:50000regionalgeologicalsurveyinQaganOboarea,theauthorsfoundthatthesequenceofBaoligaomiaoFormationexposedinQagan
5、Oboareaiscomplete,andthestratahaveabundantplantfossilsandcleardivisionmarks.BaoligaomiaoFormationwasreclassifiedduringroutesurveyandprofilemeasurementintofourlithologicmembersaccordingtothelithologicalandbiologicalappearance.Thefirstmemberislacustrineandgra_y,grayishgreenclasticrockswithalittlem
6、ildvolcanicrock,andtherearealargenumberofAngelaplantfossilsinthesiltstones;thesecondmemberisalkaline—acidicbrickredrockintercalatedwithpurplevolcanicswithsand(grave1)rock,andtheU—Pbdatingofzirconfromthetrachyteandrhyodaciteyieldedagesof(297.0+1.2)Maand(323.0~1.4)Ma;thethirdmemberisgrayandpurpleg
7、rayandesiticvolcanicswithclasticrock;thefourthmemberisgrayrhyoliticvolcanicrockswithsandstoneandmarl,andthesandstonealsohasalargenumberofAngelaplant收稿日期:2O14—12—23;改回日期:2O15—04一O1基金项目:中国地质调查局项目“内蒙古1:5万巴润布拉格(L49E022016)、萨音呼都格
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