Physics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pepi...29..233t&link_type=abstract
(NATO, Advanced Study Institute on Early Evolution of the Planets and their Atmospheres, Newcastle-upon-Tyne, England, Mar. 23-A
Physics
12
Earth Crust, Lunar Crust, Lunar Evolution, Planetary Evolution, Lunar Composition, Melting, Planetary Composition, Planetary Crusts
Scientific paper
Planetary crusts, differing in composition from that of the bulk planet, and containing large concentrations of incompatible elements such as K, U and Th, may arise in two distinctly different ways. The first, exemplified by the moon, involves flotation of a feldspathic crust during an initial melting episode in which much of the planetary body was molten. The second, probably more common type of crust is formed as a consequence of partial melting, in response to radioactive heating, in the planetary interior and the eruption of basaltic lavas. Examples include the lunar maria and the oceanic crust of the earth. Subsequent partial melting epsiodes, involving recycling into the mantle, or lower crustal melting epsiodes produce more acidic crusts, of which the terrestrial continental crust forms the type example. The upper crust requires at least three successive partial melting events.
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