Reduction of mare basalts by sulfur loss

Details Reduction of mare basalts by sulfur loss Reduction of mare basalts by sulfur loss

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..997b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Sept. 1976, p. 997-1004.

Physics

12

Basalt, Lunar Maria, Lunar Rocks, Outgassing, Reduction (Chemistry), Sulfur, Abundance, Impact Damage, Iron, Lunar Evolution, Melting

Scientific paper

Metallic Fe content and S abundance are inversely correlated in mare basalts. Either S volatilization from the melt results in reduction of Fe(2+) to Fe(0) or else high S content decreases Fe(0) activity in the melt, thus explaining the correlation. All considerations favor the model that metallic iron in mare basalts is due to sulfur loss. The Apollo 11 and 17 mare basalts were probably saturated with S at the time of eruption; the Apollo 12 and 15 basalts were probably not saturated. Non-mare rocks show a positive correlation of S abundance with metallic Fe content; it is proposed that this is due to the addition of meteoritic material having a fairly constant Fe(0) S ratio. If true, metallic Fe content or S abundance in non-mare rocks provides a measure of degree of meteoritic contamination.

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