The Moon: New Data and Hypotheses of Origin

Article
Open Access
by Oleg V. Avchenko1 and Anna V. Aseeva2
1 Russian Academy of Science (Vladivostok, Russian Federation)
2 Russian Academy of Science; Far Eastern Federal University (Vladivostok, Russian Federation)
DOI: https://doi.org/10.29202/phil-cosm/26/1
Received: 1 October 2020 / Accepted: 29 October 2020 / Published: 29 January 2021

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Abstract

A summary of the latest data on isotope geochemistry of the lunar rocks shows that their silicon, oxygen and refractory metals isotopic composition are no different from terrestrial one, indicating a single source of origin of both Earth’s and Moon’s substances. At the same time, the isotopic signature of the volatiles along with rubidium, zinc, gallium, potassium, iron in lunar rocks is fractionated considerably, showing heavy isotope enrichment compared to Earth’s ones. Kinetic isotope effect, underlying this phenomenon, occurs during the process of lava degassing when volatiles emits from the magma surface to the vacuum of space. Thus, conditions of the crystallization of lunar rocks deviate significantly from those of Earth.We consider the formation of the Moon following Marakushev’s fission theory. In the view of the theory, the Moon has been spun from proto-Earth, while a necessary impulse moment reached due to a proto-Earth’s initial fluid veneer. This event dates to approximately 50 Ma from the moment of the Solar system formation and coincides with the beginning of the proto-Earth’s core impulse segregation. The future Moon consisted of the relatively light silicate material, but also included a portion of the proto-Earth mantle. Meanwhile, other reasonable hypotheses of the Moon formation, such as impact and evaporation theories, are powerless to explain all the peculiarities of the isotopic signatures of the lunar rocks as well as the genesis of the Galilean moons.

Keywords: lunar rocks, isotope geochemistry, Moon formation, proto-Earth

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Avchenko, Oleg and Anna V. Aseeva (2021) The Moon: New Data and Hypotheses of Origin. Philosophy and Cosmology, Volume 26, 5-24. https://doi.org/10.29202/phil-cosm/26/1
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