Implications for the primitive atmosphere of the oxidation state of earth's upper mantle

Details Implications for the primitive atmosphere of the oxidation state of earth's upper mantle Implications for the primitive atmosphere of the oxidation state of earth's upper mantle

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.288...72a&link_type=abstract

Nature, vol. 288, Nov. 6, 1980, p. 72-74.

Computer Science

10

Atmospheric Composition, Earth Mantle, Oxidation, Planetary Evolution, Primitive Earth Atmosphere, Earth Core, Magma, Rocks, Spinel, Zirconium Oxides

Scientific paper

The oxidation states of materials in the earth's mantle are investigated in order to provide constraints on the composition of the primitive earth atmosphere. Intrinsic oxygen fugacities of spinels from peridotite and megacryst assemblages were measured by a ZrO2 cell technique. Results are found to lie near the synthetic iron-wustite buffer curve of the variation of oxygen fugacity with temperature, indicating the reduced nature of the spinels, and support the explanation of H2 loss by magmas at shallow depths for the contrast in the oxidation states of erupted and deep-seated rocks, such as the spinel megacysts. It is suggested that inhomogeneities in the intrinsic oxygen fugacities of samples from different areas and depths are due to interactions of an upper mantle originally in equilibrium with a core-forming metal phase with the oxidized atmosphere-hydrosphere-biosphere system. Such a reducing original mantle would then have resulted in a primitive atmosphere composed of CH4, NH3, H2, CO and H2S with laser amounts of H2O and CO2 due to volcanic outgassing.

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