Computer Science
Scientific paper
Sep 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..20...13n&link_type=abstract
Earth and Planetary Science Letters, Volume 20, Issue 1, p. 13-27.
Computer Science
3
Scientific paper
Lunar sample 14310 is a feldspar-rich basalt which shows no evidence of shock deformation or recrystallization. Pyroxenes include Mg-rich orthopyroxene, pigeonite and augite; pyroxferroite occurs in the interstitial residuum. Plagioclase feldspars are zoned from An96 to An67, and variations in feldspar compositions do not necessarily indicate loss of Na during eruption of the lava. Opaque phases include ilmenite, ulvöspinel, metallic iron, troilite, and schreibersite. Both whitlockite and apatite are present, and the interstitial residua contains baddeleyite, tranquillityite and barium rich anidine. Theoretical calculations provide estimates of partial pressures of oxygen, phosphorus and fluorine in lunar magmas. In general, partial pressures of oxygen are restricted by the limiting assemblages of iron-wüstite and ilmenite-iron-rutile; phosphorus partial pressures are higher in lunar magmas than in terrestrial lavas. The occurrence of whitlockite indicates significantly lower fugacities of fluorine in lunar magmas than in terrestrial magmas.
Hausel W. D.
Nash W. P.
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