Asafov, E. V., Sobolev, A. V., Gurenko, A. A., Arndt, N. T., Batanova, V. G., Portnyagin, Maxim V. , Garbe-Schönberg, D., Krasheninnikov, S. P., Wilson, A. H. and Byerly, G. R. (2016) Paleoarchean mantle hydrous reservoir beneath South Africa?. [Talk] In: Goldschmidt Conference 2016. , 26.06-01.07.2016, Yokohama, Japan .

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Abstract

Recent study of melt inclusions in high magnesian olivines (Fo 92.4-Fo 94.2) from the 2.7 Ga komatiites of the Abitibi Greenstone Belt, Canada [Sobolev et al, Nature, 2016] demonstrates an early contamination of melts by seawater brines indicated by elevated concentrations of Cl. Yet the melt inclusions in the most magnesian olivines (Fo 94-94.5) that have not been affected by the seawater contain up to 0.8 wt.% H2O suggesting presence of hydrous reservoir in the deep mantle at Neoarchean time. The present contribution may extend the age of this reservoir by 800
million years...

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