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- W3451914 abstract "K-Ar studies of authigenic and alteration phases from the 3.5 b.y. old Onverwacht group of South Africa delineate hydrothermal metamorphism that ended 3.3 b.y. years ago. A whole rock K-Ar errochron from analysis of barite, dolomite, chert, and serpentinite (komatiite) gives an age of 3.3 b.y. with an intercept of 1,678 + or - 103. The 3.3. b.y. age for the metamorphism in the Onverwacht was confirmed by the Argon isotopes stepwise heating experiments of komatiites and basaltic komatiites from the Onverwacht Group. In addition, the errochron suggests all the phase studied equilibrated with a reservoir of hydrothermal argon with relatively uniform isotopic composition. The concept of hydrothermal activity in the Onverwacht Group is discussed and illustrated with photographs." @default.
- W3451914 created "2016-06-24" @default.
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- W3451914 date "1985-01-01" @default.
- W3451914 modified "2023-09-27" @default.
- W3451914 title "Hydrothermal Alteration in the 3.5 b.y. old Onverwacht Group of South Africa" @default.
- W3451914 hasPublicationYear "1985" @default.
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