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Armalcolite - An oxygen fugacity indicatorLunar armaloclites, (Fe, Mg)Ti2O5, contain appreciable amounts of Ti(3+) (less than 1 to 17% of Ti mole fraction). This is a function of the oxygen fugacity occurring at the time of its formation, with lower fugacities being reflected in higher Ti(3+) contents. Controlled cooling-rate and isothermal experimentation on synthetic analog and natural specimens of 70017 and 74275 have been used to calibrate an oxygen geobarometer. Most lunar rocks have followed crystallization paths in oxygen fugacity/T space such that the prevailing oxygen fugacity can be represented by a curve near parallel to the I/W buffer curve. The oxygen fugacity estimates derived from Ti(3+) considerations of armalcolites range from the iron/wustite curve to about 1.5 log units below.
Document ID
19820038724
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Stanin, F. T.
(Tennessee Univ. Knoxville, TN, United States)
Taylor, L. A.
(Tennessee, University Knoxville, TN, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1980
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: Houston, TX
Start Date: March 17, 1980
End Date: March 21, 1980
Accession Number
82A22259
Funding Number(s)
CONTRACT_GRANT: NGL-43-001-140
CONTRACT_GRANT: NSF EAR-79-06318
Distribution Limits
Public
Copyright
Other

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