Mathematics – Logic
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1165m&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, April 1990, p. 1165-1173. Research supported by NASA.
Mathematics
Logic
20
Achondrites, Basalt, Gabbro, Petrology, Siderites, Trace Elements, Iron, Lithology, Magnesium, Microstructure, Pyroxenes, Meteorites, Mesosiderites, Stony Iron Meteorites, Origin, Formation, Lithology, Comparisons, Basalt, Achondrites, Stony Meteorites, Clasts, Petrology, Trace Elements, Mineralogy, Melting, Parent Material, Heat, Reduction, Samples, Meteorite, Laboratory Studies, Photomicrographs, Plagioclase, Pyroxene, Iron Oxide, Neutron Activation Analysis, Inaa, Petrogenesis, Models, Source, Crystalliz
Scientific paper
New petrologic and trace element data on basaltic and gabbroic clasts in mesosiderites and basaltic achondrites, combined with existing petrologic and trace element data, have served as a basis for interpretation of the petrogenesis of mesosiderite clasts. Compared with the basaltic achondrites, the mesosiderite basaltic and gabbroic clasts contain more abundant modal tridymite and merrilite, and more commonly contain augite as a late magmatic phase. Their pyroxenes tend to be more MgO-rich, and have lower Fe/Mn ratios which are positively correlated with the Fe/Mg ratio. Some of the mesosiderite basaltic and gabbroic clasts contain xenocrystic plagioclase. The basaltic clasts commonly show superchondritic Eu/Sm ratios and slight LREE depletions. The cumulate gabbro clasts are extremely depleted in LIL, have very high Eu/Sm ratios and high Lu/Sm ratios. All of these features can be explained by a model in which the mafic lithologies of mesosiderites were formed by remelting of a mixed basalt-cumulate gabbro-metal source region near the parent body surface.
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