Physics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.313..293r&link_type=abstract
Nature (ISSN 0028-0836), vol. 313, Jan. 24, 1985, p. 293, 294.
Physics
41
Cosmic Dust, Planetary Evolution, Protoplanets, Solar System, Astronomical Models, Sediments, Silicates, Soils, Water, Planets, Models, Diagenesis, Protoplanets, Formation, Composition, Physics, Chemistry, Water, Ice, Temperature, Thermal Effects, Thickness, Pressure, Parameters, Melting
Scientific paper
In the earliest stage of planetary-body formation, a proto-planet presumably consists of loosely-accumulated solid grains, or clusters of grains, with ice mantles and water-ice grains. Physical and chemical reactions, similar to diagenesis in the terrestrial permafrost, may occur and may be enhanced by an interfacial water layer between solid grains and water-ice at temperatures below the melting point of water-ice. The model proposed here eases the thermal constraints imposed by earlier models of low-temperature aqueous alteration in primitive extraterrestrial materials in which formation of an aqueous medium promoting these alterations required complete melting of the water-ice.
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