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1、第33卷第5期地質(zhì)通報Vo1.33.No.52014年5月GEOLOGICALBULLETINOFCHINAMay,2014內(nèi)蒙古阿拉善地區(qū)恩格爾烏蘇縫合帶二疊紀(jì)放射蟲及其地質(zhì)意義謝力,尹海權(quán),周洪瑞,張維杰XIELi,YINHai—quan,ZHOUHong—rui,ZHANGWei-jie1.中國地質(zhì)大學(xué)(北京)博物館,北京100083;2.中國地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院,北京1000831.GeologicalMuseum,ChinaUniversityofGeosciences,Beijing100083,China;2.SchoolofEarthSciencesandRe
2、sources,ChinaUniversityofGeosciences,Beijing100083,China摘要:報道了采自恩格爾烏蘇縫合帶的蛇綠混雜巖硅質(zhì)外來巖塊中的二疊紀(jì)阿爾拜蟲目放射蟲化石,包括3屬7種,可以劃分為2個放射蟲化石組合,能夠與日本、美國的放射蟲化石帶進(jìn)行對比,其地質(zhì)時代分別為早二疊世和中二疊世晚期一晚二疊世早期。恩格爾烏蘇縫合帶位于華北板塊和塔里木板塊之間,這些放射蟲化石的發(fā)現(xiàn)為研究恩格爾烏蘇縫合帶的構(gòu)造演化提供了新的證據(jù)。鑒于其中最新的放射蟲組合的地質(zhì)時代為中二疊世晚期一晚二疊世早期,認(rèn)為華北板塊與塔里木板塊之間自中二疊世晚期一晚二疊世早期曾經(jīng)存在古海洋,即華北板
3、塊和塔里木板塊的拼合時間是晚二疊世晚期。關(guān)鍵詞:二疊紀(jì);晚二疊世;放射蟲;蛇綠混雜巖;恩格爾烏蘇縫合帶;內(nèi)蒙古中圖分類號:P534.46;Q913.85文獻(xiàn)標(biāo)志碼:A文章編號: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