title: Secondary processing of chondrules and refractory inclusions (CAIs) by gasdynamic heating.
abstract: A theoretical model of aerodynamic heating of a meteoric particle upon entry into a parent body atmosphere is presented. The model includes the effects of melting, vaporization, and heat conduction into the particle interior. Properties of chondrule rims are interpreted in the context of the model. We conclude that the formation of true melt rims by atmospheric entry requires that a low-melting-temperature component be fractionated in the outer part of the chondrule prior to rim formation, and that the range of thermal alteration effects observed in UOC chondrites reflects the variety of encounter conditions and chondrite types. Further tests of the model are suggested.
authors.affiliation: Department of Geophysics and Planetary Sciences, Tel Aviv University, Ramat Aviv, Israel.
authors.forename: M
authors.initials: M
authors.lastname: Podolak
authors.forename: D
authors.initials: D
authors.lastname: Prialnik
authors.forename: T E
authors.initials: TE
authors.lastname: Bunch
authors.forename: P
authors.initials: P
authors.lastname: Cassen
authors.forename: R
authors.initials: R
authors.lastname: Reynolds
mesh_terms: D001272:Atmosphere; D019443:Cosmic Dust / Q000032:analysis*; D005118:Extraterrestrial Environment; D005740:Gases / Q000737:chemistry; D006358:Hot Temperature; D019110:Meteoroids; D008956:Models, Chemical; D010316:Particle Size; D016082:Solar System; D013816:Thermodynamics
chemical_list: D019443:Cosmic Dust; D005740:Gases