HP metamorphic belt of the western Alps-中国期刊网

摘要 Theunderstandingofthesubduction-relatedprocessesbenefitedbythestudiesofthehigh-pressure(HP)meta-morphicrocksfromthewesternAlps.Themoststimu-latinginformationwasobtainedfromtheinnerpartofthewesternAlpinebelt,wheremosttectonicunitsshowanearlyAlpineeclogite-faciesrecrystallisation.ThisisespeciallytruefortheAustroalpineSesiaZoneandthePenninicDora-Mairamassif.FromtheSesiazone,whichconsistsofawidespectrumofcontinentalcrustlithologiesrecrystallisedtoquartz-eclogite-faciesmin-eralassemblages,thefirstfindingofajadeite-bearingmeta-granitoidhasbeendescribed,supportingevidencethatevencontinentalcrustmaysubductintothemantle.FromtheDora-Mairamassifthefirstoccurrenceofregionalmetamorphiccoesitehasbeenreported,open-ingthenewfertilefieldoftheultrahigh-pressuremeta-morphism(UHPM),whichisnowbecomingtheruleinthecollisionalorogenicbelts.

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HP metamorphic belt of the western Alps

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HP metamorphic belt of the western Alps

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