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Removal of a Constraint on the Composition of the Lunar Interior

Anderson, Don L. (1973) Removal of a Constraint on the Composition of the Lunar Interior. Journal of Geophysical Research, 78 (17). pp. 3222-3225. ISSN 0148-0227. doi:10.1029/JB078i017p03222.

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Ringwood and Essene (1970) proposed that the CaO and Al_2O_3 contents of the deep interior of the moon must be less than 6% each. This constraint has been generally accepted and has led to models of the lunar interior that are dominated by ferromagnesium silicates. This constraint is invalid. High CaO and Al_2O_3 peridotites have broader intermediate-density (3.3–3.4 g/cm^3) fields than the Ringwood-Essene 'lunar pyroxenite', and the high-density phase occurs at higher pressure. Likewise, the gabbro-eclogite transformation pressure increases with Al_2O_3 content. The moon can have a thick plagioclase rich outer shell and a high Ca-Al interior.

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Additional Information:© 1973 by the American Geophysical Union. Manuscript Received: 3 Aug 1972. Revised December 19, 1972. Contribution 2195, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91109. I would like to acknowledge the helpful suggestions of P. Gast, A. E. Ringwood, G. Kennedy, and I. MacGregor. This research was supported by the National Aeronautics and Space Administration under contract NASA NGL 05-005-0069.
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NASANGL 05-005-0069
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Caltech Division of Geological and Planetary Sciences2195
Issue or Number:17
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Official Citation:Anderson, D. L. (1973), Removal of a constraint on the composition of the lunar interior, J. Geophys. Res., 78(17), 3222–3225, doi:10.1029/JB078i017p03222.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55032
Deposited By: Ruth Sustaita
Deposited On:19 Feb 2015 23:29
Last Modified:10 Nov 2021 20:40

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