Mantle oxidation state and its relationship to tectonic environment and fluid speciation

Details Mantle oxidation state and its relationship to tectonic environment and fluid speciation Mantle oxidation state and its relationship to tectonic environment and fluid speciation

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990sci...248..337w&link_type=abstract

Science (ISSN 0036-8075), vol. 248, April 20, 1990, p. 337-345. Research supported by the Gas Research Institute and NSF.

Computer Science

105

Earth Mantle, Oxidation, Peridotite, Subduction (Geology), Tectonics, Basalt, Degassing, Earth Crust, Garnets, Iron Compounds

Scientific paper

The role of tectonic environment in the mantle oxidation state is examined. It was found that peridotite xenoliths from continental localities exhibit an oxygen fugacity (fO2) range -1.5 to +1.5 log units relative to the fayalite-magnetite-quartz (FMQ) buffer, with the lowest values being from zones of continental extension. While xenoliths with fO2 greater than FMQ come from regions of recent or active subduction, are commonly amphibole-bearing, and show trace-element and isotopic evidence of fluid-rock interaction, peridotites from ocean ridges are reduced and have an average fO2 of about 0.9 log units relative to FMQ, virtually coincident with values obtained from mid-ocean ridge basalt (MORB) gases. These data furnish evidence of the genetic link between MORB fluids and residual peridotite, and indicate that the asthenosphere has CO2 and H2O as its major fluid species. Fluids in the lithosphere are also dominated by CO2 and H2O, and native C is generally unstable.

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