欢迎来到天天文库
浏览记录
ID:51413845
大小:1.30 MB
页数:7页
时间:2020-03-23
《内蒙古阿拉善地区恩格尔乌苏缝合带二叠纪放射虫及其地质意义.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第33卷第5期地质通报Vo1.33.No.52014年5月GEOLOGICALBULLETINOFCHINAMay,2014内蒙古阿拉善地区恩格尔乌苏缝合带二叠纪放射虫及其地质意义谢力,尹海权,周洪瑞,张维杰XIELi,YINHai—quan,ZHOUHong—rui,ZHANGWei-jie1.中国地质大学(北京)博物馆,北京100083;2.中国地质大学(北京)地球科学与资源学院,北京1000831.GeologicalMuseum,ChinaUniversityofGeosciences,Beijing100083,China;2.SchoolofEarthSciencesandRe
2、sources,ChinaUniversityofGeosciences,Beijing100083,China摘要:报道了采自恩格尔乌苏缝合带的蛇绿混杂岩硅质外来岩块中的二叠纪阿尔拜虫目放射虫化石,包括3属7种,可以划分为2个放射虫化石组合,能够与日本、美国的放射虫化石带进行对比,其地质时代分别为早二叠世和中二叠世晚期一晚二叠世早期。恩格尔乌苏缝合带位于华北板块和塔里木板块之间,这些放射虫化石的发现为研究恩格尔乌苏缝合带的构造演化提供了新的证据。鉴于其中最新的放射虫组合的地质时代为中二叠世晚期一晚二叠世早期,认为华北板块与塔里木板块之间自中二叠世晚期一晚二叠世早期曾经存在古海洋,即华北板
3、块和塔里木板块的拼合时间是晚二叠世晚期。关键词:二叠纪;晚二叠世;放射虫;蛇绿混杂岩;恩格尔乌苏缝合带;内蒙古中图分类号:P534.46;Q913.85文献标志码:A文章编号:1671—2552(2O14)O5—0691-07XieL,YinHQ,ZhouHR,ZhangWJ.PermianradiolariansfromtheEngeerwususuturezoneinAlxaareaofInnerMon-goliaanditsgeologicalsignificance.GeologicalBulletinofChina,2014,33(5):691—697Abstract:Detai
4、lsofPermianalbaillellariansfromtheexoticsiliceousblockswithintheEngeerwusuophioliticm61angealongtheEng—eerwususuturezonearepresentedforthefirsttime.Amongthem,sevenspeciesbelongingtOthreegeneraweresystemicallyinvesti—gated.MostspeciesrecordedcanbecorrelatedwiththePermianradiolarianzonesinJapanandth
5、eUSA.Tworadiolarianassemblagesweredistinguished,indicativeofEarlyPermianandlateMiddletoearlyLatePermianrespectively.Onthebasisofthedeep—watersettingsindicatedbythealbaillellarianfauna,theradiolariansextractedfromtheexoticsiliceousblockswithintheEngeerwusuophiol-iticm61angealongtheEngeerwususuturez
6、onemayprovidenewevidenceforthetectonicevolutionoftheEngeerwususuturezonebetweentheNorthChinaPlateandtheTarimPlate.AccordingtOthedeep—watersettingindicatedbythelatestradiolarianassem—blageoflateMiddle-earlyLatePermianepoch,theauthorsholdthatanoceanexistedbetweentheNorthChinaPlateandtheTarimPlatedur
7、inglateMiddletOearlyLatePermian,andtheclosureoftheoceanbetweentheNorthChinaPlateandtheTarimPlatemighthaveoccuredduringlateLatePermianperiod,Keywords:Permian;LatePermian;radiolarians;ophioliticm61ange;Engeerwususu
此文档下载收益归作者所有