Oxygen fugacity controls in the earth's upper mantle

Details Oxygen fugacity controls in the earth's upper mantle Oxygen fugacity controls in the earth's upper mantle

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.348..437b&link_type=abstract

Nature (ISSN 0028-0836), vol. 348, Nov. 29, 1990, p. 437-440. Research supported by DFG and Australian Research Council.

Computer Science

43

Earth Mantle, Geochemistry, Tectonics, Equilibrium Methods, Olivine, Oxidation-Reduction Reactions, Spinel

Scientific paper

The behavior of four 'barometers' of oxygen fugacity in the earth's upper mantle are compared based on the compositions of coexisting minerals, including a new empirical olivine-orthopyroxene-spinel barometer that has been calibrated experimentally in spinel lherzolite at pressure, temperatures, and compositions appropriate to the upper mantle. Application of this barometer to mantle-derived rocks and basaltic melts of different tectonic settings suggests that the upper mantle in only weakly buffered by Fe(3+)/Fe(2+) equilibria. Large-scale heterogeneity in f(O2) structure is governed by recycling processes and injection of oxidized crustal material into a moderately reduced, poorly buffered asthenosphere.

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