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- W2365483314 abstract "High-ultrahigh pressure lherzolite,garnet-pyroxenite,quartz-magnesitite and retrograde eclogite occur in the Zaheba- Almantai ophiolites.The Si content(pfu)of phengite in quartz-magnesitites is more than 3.35 with the maximum up to 3.77, indicating they are the products of high-ultrahigh pressure metamorphism.K20 contents of quartz-magnesitite and its wall rocks i.e. serpentinized lherzolite are extremely low,and the ratio of Na/(Na+K)of phengite is less than 0.04.These geochemical characteristics show that the phengite should not contain any excess Ar and hence be an ideal mineral for~(40)Ar/~(39)Ar dating.The precise ~(40)Ar/~(39)Ar dating of the phengite in quartz-magnesitite is 281.6±2.5Ma.The characteristics of mineral chemistry display the phengite had undergone retrograde metamorphism which represents the exhumation age of metamorphism.This study shows that the exhumation of the Zaheba-Almantai ophiolites took place in early Permian." @default.
- W2365483314 created "2016-06-24" @default.
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- W2365483314 date "2007-01-01" @default.
- W2365483314 modified "2023-09-23" @default.
- W2365483314 title "~(40)Ar/~(39) Ar geochronology of the ultrahigh-pressure metamorphic quartz-magnesitite in Zaheba, eastern Junggar, Xinjiang." @default.
- W2365483314 hasPublicationYear "2007" @default.
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