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Differentiation of the matter of the moonThe following facts were uncovered in comparing the basaltic surface rocks of the moon with terrestrial tholeiitic basalts and ordinary chondrites: (1) there is an excess of the so-called refractory chemical elements, including the group of truly refractory elements, the rare earths, U, and Th, in comparison with their content in primitive terrestrial basalts and chondrites; (2) the so-called siderophilic elements have lower contents in the lunar surface rocks than in terrestrial rocks; (3) the low alkali content (Na, K, Rb) in lunar rocks is established; (4) there is a low content of H2O and the ordinary gases CO2, halides, etc.; (5) the low content of metals with high vapor pressure, (In, Tl, etc.) has been established. It is proposed that U and Th were carried from the internal areas to the peripheral rocks of the moon during magmatic activity, i.e., up to 3 billion years ago. This redistribution of U and Th lead to their concentration in surface layers of the moon, and the heat which they generated was lost into surrounding space. The conclusion is then reached that in order to understand processes on the moon, the chondritic model cannot be used.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Vinogradov, A. P.
(Academy of Sciences (USSR) Moscow, Ussr)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Publication Information
Publication: NASA, Washington The Soviet-Am. Conf. on Cosmochem. of the Moon and Planets, pt. 1
Subject Category
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
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