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