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Partial pressures of oxygen, phosphorus and fluorine in some lunar lavasLunar 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 An(96) to An(67), and variations in feldspar compositions do not necessarily indicate loss of Na during eruption of the lava. Opaque phases include ilmenite, ulvospinel, metallic iron, troilite, and schreibersite. Both whitlockite and apatite are present, and the interstitial residua contain baddeleyite, tranquillityite and barium-rich sanidine. 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-wuestite 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.
Document ID
19740030792
Document Type
Reprint (Version printed in journal)
Authors
Nash, W. P.
Hausel, W. D. (Utah, University Salt Lake City, Utah, United States)
Date Acquired
August 7, 2013
Publication Date
September 1, 1973
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 20
Issue: 1, Se
Subject Category
CHEMISTRY
Funding Number(s)
CONTRACT_GRANT: NGR-45-003-090
Distribution Limits
Public
Copyright
Other