Primitive ultrafine matrix in ordinary chondrites

Details Primitive ultrafine matrix in ordinary chondrites Primitive ultrafine matrix in ordinary chondrites

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..56..107r&link_type=abstract

Earth and Planetary Science Letters, vol. 56, Dec. 1981, p. 107-126. Research supported by the Deutsche Forschungsgemeinschaft

Computer Science

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Chemical Composition, Chondrites, Grain Boundaries, Meteoritic Composition, Meteoritic Microstructures, Antimony, Chondrule, Electron Probes, Lead (Metal), Neutron Activation Analysis, Potassium, Sodium, Zinc, Meteorites, Ordinary Chondrites, Matrix, Samples, Meteorite, Temperature, Laboratory Studies, Enrichment, Volatiles, Refractory Material, Crystals, Element Ratios, Electron Microscopy, Origin, Source, Impacts, Catalog, Shock Effects, Microprobe Methods, Neutron Activation Analyses, Aluminum, Siderophi

Scientific paper

Ultrafine matrix material has been concentrated by sieving and filtering disaggregated samples of six ordinary chondrites of different classes. This component(s), 'Holy Smoke' (HS), is enriched in both volatile, e.g. Na, K, Zn, Sb, and Pb, as well as refractory elements, e.g. W and REE; however, the element ratios vary greatly among the different chondrites. SEM studies show that HS contains fragile crystals, differing in composition, and apparently in gross disequilibrium not only among themselves but also with the major mineral phases and consequently thermodynamic equilibration did not occur. Thus HS must have originated from impacting bodies and/or was inherent in the 'primitive' regolith. Subsequent impact brecciation and reheating appears to have altered, to varying degrees, the original composition of this ultrafine matrix material. Recent 'cosmic dust' studies may indicate that HS still exists in the solar system. Survival of such delicate material must be considered in all theories for the origin of chondrites.

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