Cosmic setting for chondrule formationChondrules are igneous-textured, millimeter-sized, spherical to irregularly-shaped silicate objects which constitute the major component of most chondrites. There is agreement that chondrules were once molten. Models for chondrule origin can be divided into two categories. One involves a 'planetary' setting, which envisages chondrules forming on the surfaces of parent bodies. Melting mechanisms include impact and volcanism. The other category is concerned with a cosmic setting in the solar nebula, prior to nebula formation. Aspects regarding the impact on planetary surfaces are considered, taking into account chondrule abundances, the abundancy of agglutinates on the moon, comminution, hypervelocity impact pits, questions of age, and chondrule compositions. Attention is also given to collisions during accretion, collisions between molten planetesimals, volcanism, and virtues of a nebular setting.
Document ID
19850044394
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Taylor, G. J. (New Mexico Univ. Albuquerque, NM, United States)
Scott, E. R. D. (New Mexico Univ. Albuquerque, NM, United States)
Keil, K. (New Mexico, University Albuquerque, NM, United States)