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A statistical-chemical and thermodynamic approach to the study of lunar mineralogyPrincipal components analysis is used to study the chemical compositions of pyroxenes of five Apollo 12 specimens. Important correlations are recognized in the variation of oxide weight per cent. These correlations indicating substitutional relationships can be interpreted as representative of stable and metastable trends of crystallization by using crystal-chemical and thermodynamic information. The per cent variance of pyroxene groups with characteristic trends in each specimen can be evaluated and interpreted in terms of history of crystallization. Distribution of Fe and Mg in certain pairs of olivine and pyroxene, which are found in contact in the rock and which may have crystallized simultaneously, is useful in recognizing the tendency towards chemical equilibrium in Fe-Mg distribution during a limited interval in the liquidus or subsolidus stages.
Document ID
19740038315
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Saxena, S. K.
(Virginia Polytechnic Institute, Blacksburg, Va., United States)
Walter, L. S.
(NASA Goddard Space Flight Center Planetology Branch, Greenbelt, Md., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1974
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 38
Subject Category
Chemistry
Accession Number
74A21065
Funding Number(s)
CONTRACT_GRANT: NGR-47-004-093
Distribution Limits
Public
Copyright
Other

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