Physics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sosyr..33..382k&link_type=abstract
Solar System Research, vol. 33, p. 382 (1999)
Physics
2
Scientific paper
Based on the geophysical constraints on velocities of seismic waves, moment of inertia, and mass, the chemical composition and the internal structure of the Moon were constructed by mathematical simulation of phase relations in the CaO-FeOMgO-Al2O3-SiO2-Fe-FeS system. The method for solving the inverse problem of the determination of the chemical composition, temperature, and physical properties of the Moon, as well as its core size, is based on the minimization of the deviations of the calculated geophysical parameters from observational data. The lunar mantle was shown to be stratified according to the chemical composition. The radius of the lunar core was estimated to be 290-350 km for an Fe core and 460-530 km for an FeS core. The chemical compositions of both the silicate shell (crust + mantle) and the Moon as a whole (enrichment in SiO2 , FeO, and refractory elements, depletion in MgO, and very low Fe/Si ratio) resemble neither the terrestrial matter nor the material of chondrites and achondrites. All this gives evidence that the present-day hypotheses for the Moon's formation from the Earth's mantle do not meet the geophysical constraints.
Kronrod Victor A.
Kuskov Oleg L.
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