Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998lpico.957...31p&link_type=abstract
Origin of the Earth and Moon, Proceedings of the Conference held 1-3 December, 1998 in Monterey, California. LPI Contribution N
Astronomy and Astrophysics
Astrophysics
Earth Crust, Lunar Composition, Moon, Earth-Moon System, Ejecta, Lunar Evolution, Dynamic Models, Mathematical Models, Solar System Evolution, Geochronology, Solar System
Scientific paper
The model of Earth-Moon coaccretion is developed in the frameworks of the standard scenario for the origin of the solar system. We take into account the evolution of a population of large bodies that disappear in mutual catastrophic collisions (macroimpacts) during planetary accretion. The present model takes into account the additional feeding of presatellite swarm by the material ejected from the outer shell of a growing planet due to macroimpacts of falling bodies. This model includes five chemical reservoirs: circumsolar and circumplanetary disks and primitive core, mantle, and permanently originating and destroying crust of the Earth. Development of the dynamic model allows for the ejection of planetary matter into circumsolar and circumterrestrial orbits during planetary accumulation. The refined rate of Earth's mass growth is slow compared to our previous calculations. The outward flux F,(T) of ejected matter has a maximum at the main stage of accumulation. One can see in the presented charts that the notably detectable amounts of planetary matter were added to the planet's feeding zone and again taken up by the growing Planet and its protosatellite disk. The problems of formation, composition, and thickness of primitive basalt-eclogitic Earth's crust and the problem of lunar composition are intimately related. The comparatibility of masses and composition of these two reservoirs and the synchronism of the process of their forming and an interchange by material must be put in the basic of ensuing models. The intermediate model is realized instead of the known alternative models "the cold primitive Earth" and "magma ocean".
Pechernikova G.
Vityazev A.
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