Estimates of Oxygen Fugacity in the Basaltic Shergottites From Electron Microprobe Oxygen Analysis

Details Estimates of Oxygen Fugacity in the Basaltic Shergottites From Electron Microprobe Oxygen Analysis Estimates of Oxygen Fugacity in the Basaltic Shergottites From Electron Microprobe Oxygen Analysis

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mmws.work...23h&link_type=abstract

Workshop on the Issue Martian Meteorites: Where do we Stand and Where are we Going?, p. 23

Computer Science

Magnetite, Meteorites, Meteoritic Composition, Microanalysis, Oxides, Oxygen, Shergottites, Stoichiometry, Cations, Snc Meteorites, Crystallization, Spinel

Scientific paper

The basaltic shergottites consist of four meteorites thought to have a martian origin: Shergotty, Zagami, EETA 79001, and QUE 94201. All are basaltic in composition, but only QUE 94201 contains no cumulus pyroxene and may therefore represent a martian liquid. Previous estimates of fO2 at the time of crystallization of the shergottites range from the quartz-fayalite-magnetite (QFM) buffer to 4 log units below QFM, based on coexisting Fe-Ti oxides, for all but QUE94201. Oxygen fugacity conditions for QUE94201 are near the iron-wustite (IW) buffer about 4 log units below QFM. The current research aims to refine the estimates of fO2, for the basaltic shergottites, through electron microprobe techniques. The technique of quantitative analysis of fO2 using the electron micro-probe has been developed to the point where O can be analyzed with certainty comparable to the analysis of most cations. Practical application of the technique to naturally occurring spinels has been demonstrated demonstrated. A set of O standards now exists that can be readily obtained. The technique also allows an assessment of stoichiometry, since the cation total, on the basis of four O atoms, does not rely on the assumption of stoichiometry. Instead, the amount of Fe3(+), is determined by charge balance.

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