Removal of a constraint on the composition of the lunar interior | Zendy

Anderson Don L. | Zendy

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Removal of a constraint on the composition of the lunar interior

Author(s) -

Anderson Don L.

Publication year - 1973

Publication title -

journal of geophysical research

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.67

H-Index - 298

eISSN - 2156-2202

pISSN - 0148-0227

DOI - 10.1029/jb078i017p03222

Subject(s) - plagioclase , geology , gabbro , eclogite , geology of the moon , constraint (computer aided design) , geochemistry , anorthosite , mineralogy , astrobiology , physics , basalt , geometry , quartz , seismology , mathematics , paleontology , tectonics , subduction

Ringwood and Essene (1970) proposed that the CaO and Al 2 O 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 2 O 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 2 O 3 content. The moon can have a thick plagioclase rich outer shell and a high Ca‐Al interior.

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