DEFORMATION CHARACTERISTICS AND ESR DATING OF ANHUA-XUPU FAULT BELT IN THE XUEFENG MOUNATAINS, HUNAN-中国Betway体育网页登陆

摘要 Anhua-XupufaultbeltplaysaveryimportantroleintheformationofXuefengMountains.Thefaultbeltshowsanarc-structureextrudingtowardsNW.Faultrocks,microstructuresandhomogeneoustemperature(concentratedaround160°C)offluidinclusionsinthequartzveinsshowsthatthefaultbeltmainlyunderwentshallowbrittledeformationandthehighest-gradedynamicmetamorphicrockismylonitizedsericitephyllite.TheESR(ElectronSpinResonance)datingfromthequartzveinsinthefaultrocksshowsthatthefaultbeltunderwenttwointensefluidmovementstagesatYanshanian(156.9～136.2Ma,119.8～90.6Ma);moreovernotonlytheoccurrenceandmicrostructuresbutalsothehomogeneoustemperatureofthequartzveinsdevelopedinthattwostagesshowobviousdiversity,whichcanprovethatthereexiststhereversionperiodofMesozoicextensionandcompressionmovementofXuefengmountainsbetweenthesetwostages.

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DEFORMATION CHARACTERISTICS AND ESR DATING OF ANHUA-XUPU FAULT BELT IN THE XUEFENG MOUNATAINS, HUNAN

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