Mathematics – Logic
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lpsc...16..137s&link_type=abstract
(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,
Mathematics
Logic
8
Breccia, Chondrites, Metamorphism (Geology), Meteoritic Composition, Achondrites, Chondrule, Olivine, Pyroxenes, Regolith, Meteorites, Brecciation, Metamorphism, Ordinary Chondrites, Equilibration, Petrography, H Chondrites, L Chondrites, Samples, Meteorite, Chondrules, Clasts, Olivine, Pyroxene, Element Ratios, Anomalies, Stone Meteorites, Slovak, Lithification, Regolith, Breccias, Conparisons, Fragments, Mixing, Chemistry, Texture, Classification, Petrology, Shock Effects, Techniques, Procedure, Parent Bo
Scientific paper
Ten objects with aberrant Fe/(Fe + Mg) ratios have been found in apparently unbrecciated types 4-6 H and L chondrites. Since the Fe/(Fe + Mg) ratios of these objects are incompatible with the metamorphic history of the host chondrites, it is concluded that a high proportion of ordinary chondrites are breccias that were lithified after peak metamorphism. This is consistent with the results of Scott (1984), who concluded that most type three ordinary chondrites are breccias of materials with diverse thermal histories, even though they do not show prominent brecciation. It is found that the classification scheme of Van Schmus and Wood (1967) does not identify chondrites with similar thermal histories; the petrologic type of a chondrite is only a measure of the average thermal history of its ingredients. Chondrite and achondrite breccias are also compared in order to understand how brecciation of chondrites after metamorphism is so well camouflaged.
Keil Klaus
Lusby David
Scott Edward R. D.
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