High temperature rims around chondrules in primitive chondrites - Evidence for fluctuating conditions in the solar nebula

Details High temperature rims around chondrules in primitive chondrites - Evidence for fluctuating conditions in the solar nebula High temperature rims around chondrules in primitive chondrites - Evidence for fluctuating conditions in the solar nebula

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.105...65k&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 105, no. 1-3, July 1991, p. 65-80.

Physics

19

Chondrites, Meteoritic Composition, Planetary Nebulae, Solar Temperature, Chemical Evolution, Chondrule

Scientific paper

The present study examines the properties of the high-temperature rims or rim sequences surrounding 78 chondrules, whether they formed by the accretion of molten material or as condensates from a gas. Any new constraints they may place on the physical and chemical processing of material in the solar nebula are determined. It was found that the rims examined can be sorted into three chemical subtypes, Fe,Ca-rich, Fe,Ni-metal-rich, and ferro-magnesian chondrule rims. The compositions of minerals in these rims are often drastically different from those in the underlying chondrule cores, indicating that the solar nebula was chemically heterogeneous. Some of the Fe,Ca-rich chondrule rims are greatly similar to some of the rims around refractory inclusions, suggesting that chondrules and refractory inclusions experienced late coeval processing. It is inferred from the textures of the chondrule rims that they formed at high temperatures and that they accreted onto chondrules that had already solidified.

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