Mathematics – Logic
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002usnc.conf...35m&link_type=abstract
Unmixing the SNCs: Chemical, Isotopic, and Petrologic Components of the Martian Meteorites, p. 35-36
Mathematics
Logic
Crystallization, Heterogeneity, Magma, Mars (Planet), Oxygen, Pyroxenes, Metamorphism (Geology), Basalt, Silicates, Shergottites, Snc Meteorites, Minerals
Scientific paper
Oxygen fugacity (fO2) is a key physical parameter which influences the crystallization sequences of magmas, as well as the composition of the resulting minerals. On a planet-wide basis, the distribution of elements between the metallic core and the silicate portion of the planet is influenced by the fO2 at the time of differentiation. Additionally, if the intrinsic fO2 of a planet is known, the processes which may change that value can be investigated. Although magmatic fO2 can reflect the degree of oxidation of the magma source region, it can also provide insight into processes, such as metasomatism, degassing, or assimilation, which may have operated on and in the magma as it moved to the surface. Recent work on the basaltic shergottites has provided new measurements of the fO2 recorded in the pyroxenes of these meteorites. These pyroxenes exhibit an fO2 range of approximately 3-4 orders of magnitude. Several processes have been proposed to explain the origin of these differences, the majority of which rely on assimilation. New data, however, is consistent with intrinsic fO2 differences in the magma source region being responsible for the measured SNC fO2 variations. More detailed analyses of natural SNC pyroxenes are needed in order to better understand the source of the fO2 range recorded in the basaltic shergottites.
McCanta M. C.
Rutherford Malcolm J.
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