Water and the thermal evolution of carbonaceous chondrite parent bodies

Details Water and the thermal evolution of carbonaceous chondrite parent bodies Water and the thermal evolution of carbonaceous chondrite parent bodies

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...82..244g&link_type=abstract

Icarus (ISSN 0019-1035), vol. 82, Dec. 1989, p. 244-280.

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109

Carbonaceous Chondrites, Meteoritic Composition, Moisture Content, Thermal Environments, Oxygen Isotopes, Regolith, Temperature Distribution, Temperature Effects

Scientific paper

Two hypotheses are proposed for the aqueous alteration of carbonaceous chondrites within their parent bodies, in which respectively the alteration occurs (1) throughout the parent body interior, or (2) in a postaccretional surface regolith; both models assume an initially homogeneous mixture of ice and rock that is heated through the decay of Al-26. Water is seen to exert a powerful influence on chondrite evolution through its role of thermal buffer, permitting substitution of a low temperature aqueous alteration for high temperature recrystallization. It is quantitatively demonstrated that liquid water may be introduced by either hydrothermal circulation, vapor diffusion from below, or venting due to fracture.

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