Upper mantle oxygen fugacity recorded by spinel lherzolites

Details Upper mantle oxygen fugacity recorded by spinel lherzolites Upper mantle oxygen fugacity recorded by spinel lherzolites

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..626m&link_type=abstract

Nature (ISSN 0028-0836), vol. 322, Aug. 14, 1986, p. 626-628.

Physics

32

Earth Mantle, Gas Evolution, Oxygen, Planetary Evolution, Spinel, Geochemistry, Mineralogy

Scientific paper

Oxygen fugacity measurements were made for upper mantle spinel-lherzolite zenoliths entrained in alkaline magmas. The measurements were performed by determining the Fe3O4 (magnetite) fraction of MgAl2O4-rich synthetic spinel and using the data to project the thermobarometric fugacities for three-phase olivine-orthopyroxene-spinel. The calculated fugacities, corrected for 15 kbar pressure, were colocated or above those of the quartz-fayalite-magnetite buffer, which implies that the shallow upper mantle has a fugacity signature that is not in equilibrium with the metallic core. It is concluded that CO2 and H2O, not CH4 and H2, dominate the C-H-O system gaseous species. It is noted that the results do not preclude the possibility of low fugacity zones at a greater depth or formation of the mantle at a greater interval in the past.

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