The effect of Fe on CR redox state in spinel-saturated basalts

Details The effect of Fe on CR redox state in spinel-saturated basalts The effect of Fe on CR redox state in spinel-saturated basalts

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..509h&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 509.

Computer Science

Iron, Chromium, Spinel, Basalt, Olivine, Stoichiometry

Scientific paper

Cr is thought to exist primarily as Cr(3+) in basalts that crystallize under terrestrial redox conditions, and as Cr(2+) under lunar conditions. The different partitioning behavior of Cr(2+) and Cr(3+) in basalts is thought to be reflected in the generally higher Cr-content of lunar magmas in comparison to their terrestrial counterparts. The partitioning behavior of Cr in basaltic systems is, however, poorly understood. The lack of variation in the Fe-bearing systems led us to question whether Cr(2+) exists in the presence of Fe(3+). We have performed a series of 1-atm experiments over large ranges of O2 designed to (1) evaluate the effect of Fe(3+) on Cr redox state and (2) determine D(Cr) for both Cr(2+) and Cr(3+).

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