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《初论昆祁秦缝合系.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第23卷第6期地球学报Vol.23No.62002-12/501-508ACTAGEOsCIENTIAsINICAdec.2002/501-508初论昆祁秦缝合系边千韬赵大升叶正仁常承法罗小全高山林(中国科学院地质与地球物理研究所,北京,100029)摘要中央造山带范围内的诸多新元古代晚期—早古生代蛇绿岩带可视为一个系统———昆祁秦缝合系。大致可分西、中、东3段。西段包括库地-苏巴什和麻扎-康西瓦2条缝合带及西昆中微地块;中段包括阿尔金、北祁连、柴达木北缘、祁漫塔格-乌妥及东昆仑南缘5条缝合带和中-南祁连、柴达木
2、、阿牙克库木及玛沁4个较大的微地块及诸多较小的微地块;东段为商丹缝合带和勉略缝合带及其所夹持的秦中-大别微地块。昆祁秦缝合系是Rodinia超大陆经历了早—中震旦世(约780~600Ma)初期裂解阶段,晚震旦世—奥陶纪(约600~440Ma)昆祁秦多岛洋阶段,晚奥陶世—早志留纪(约440~400Ma)昆祁秦多岛洋闭合阶段形成的一个包含若干条缝合带和若干个微地块的体系,是中央造山带的基础。关键词蛇绿岩缝合系新元古代—早古生代中央造山带ApreliminaryStudyOfthekunlun-Oilian-Oinli
3、ngSutureSystemBIAN@iantaoZ~AOdashengYEZhengrenC~ANGChengfalUOXiaoCuanGAOshanlin(InstituteofGeologyandGeoPhysics,ChineseacademyofSciences,Beijing,100029)AbstractThelateNeo-Proterozoic-EarlyPaleozoicsuturezoneswithintheCentralOrogenicBeltofChinacanbeconsidereda
4、sys-tem—theKunlun-@ilian-@inlingsuturesystem(K@@suturesystem).Itisbasicallydividedintothewestern,centralandeasternsectors.ThewesternsectorconsistsoftheKuda-subashisuturezone,theMazha-KangsiwarsutureandthecentralWestKunlunmi-croblock.Thecentralsectorcoversfive
5、suturezones,i.e.,theAltun,North@ilian,@aidamnorthernmarginal,@imantag-WutuoandEastKunlunsouthernmarginalsutures,inadditiontosomemicroblockssuchasthemid-south@ilian,@aidam,AyakkumandMaCenmicroblocks.Theeasternsectoriscomposedoftheshangdansuturezone,Mianluesutu
6、rezoneandcentral@inling-dabiemicroblock.TheK@@suturesystemexperienceddextending-riftingoftheRodiniasuper-continentintheearly-middlesinianperiod(about780~600Ma);itheformationandevolutionoftheK@@archipelagicoceanduringthelatesinian—Ordovician(about600~440Ma);an
7、d@closingoftheK@@oceanandformingoftheK@@suturesystemduringthelateOrdovician—latesilurian(about440~400Ma).Asasystemcomprisingmanysuturezonesandmicroblocks,theK@@suturesystemconstitutesthefounda-tionoftheCentralOrogenicBeltofChina.keywOrdsophiolitesuturesystems
8、inian—EarlyPaleozoicCentralOrogenicBeltofChina构成中央造山带主体的昆仑山、祁连山和秦岭系统,从整体上认识它们之间的关系、形成演化及其3个著名造山带从大地构造体制总体而言可视为统大地构造特征。一造山带(张文佑等,1986;殷鸿福等,1998;任纪舜1大地构造位置和结构等,1999)。其内广泛分布着诸多晚震旦世—早古生1.1大地构
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