Blueschist from the Toudaoqiao Area, Inner Mongolia, NE China： Evidence for the Suture between the Ergun and the Xing＇an Blocks-中国期刊网

摘要 BlueschistaccompaniedbypeliticschistexposealongtheXinlin-XiguitufaultintheToudaoqiaoarea,northeasternChina.Inthispaper,theblueschistissystematicallystudiedonthepetrographyandmineralchemistry.Theamphibolesintheblueschistarezonedfromwinchitecoretomagnesioriebeckite/glaucophanerimtowinchiteoutermostrim.Thepeakmetamorphicconditionsaredefinedbythemineralassemblageofmagnesioriebeckite/glaucophane,epidote,high-Siphengite(Si<7.1),chlorite,albite,hematiteandquartz,indicatinganepidote-blueschistfaciesmetamorphism.TheP-TconditionsareestimatedasT=350–400℃andP=10-12kbar.TheoccurrenceoftheblueschistalongtheXinlin-XiguitufaultstronglysuggeststhefaultisthesuturebetweentheErgunandtheXing'anblockssituatedintheeasternportionsoftheCentralAsiaOrogenicBelt(CAOB).

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Blueschist from the Toudaoqiao Area, Inner Mongolia, NE China： Evidence for the Suture between the Ergun and the Xing＇an Blocks

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Blueschist from the Toudaoqiao Area, Inner Mongolia, NE China： Evidence for the Suture between the Ergun and the Xing＇an Blocks

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