On the Origin and Evolution of Minerals in Chondrite Matrix Material

Details On the Origin and Evolution of Minerals in Chondrite Matrix Material On the Origin and Evolution of Minerals in Chondrite Matrix Material

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1161s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1161

Mathematics

Logic

Chondrites: Matrixes, Chondrules: Precursors, Condensation, Solar Nebula

Scientific paper

We have developed the outline of a model to account for the mineralogical diversity of matrix, rims and chondrules in all chondrite groups. We infer that FeO-poor, fine-grained, amorphous silicates and metallic Fe,Ni, which condensed in the nebula above 800 K were major precursor materials for FeO-poor chondrules (type I). At lower ambient nebular temperatures, amorphous silicate materials became enriched in FeO providing precursor materials for FeO-rich chondrules (type II). The higher proportion of FeO-rich chondrules in O chondrites relative to C chondrites can be attributed to the formation of more chondrules at lower ambient temperatures in the O chondrite source region. Recycling of some chondrules accounts for FeO-rich relict grains in FeO-poor chondrules. Amorphous material may have been hydrated below 400 K in the nebula. Chondrite matrix materials mostly formed by nebular and asteroidal processing of amorphous nebular materials that accreted to chondrules. Some matrix grains were reheated, probably during chondrule formation to make larger, well ordered phases which were relatively unaffected by subsequent nebular and asteroidal processing.

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