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- W2094804310 abstract "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 merrillite, 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 super-chondritic 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. Reducing agents (P, C?, S?) from the metallic fraction reduce FeO out of the silicate melt and result in the positive correlation of Fe/Mn with Fe/Mg observed in pyroxene analyses and the modal abundances of tridymite, merrillite, and augite. Xenocrystic plagioclase is a natural consequence of remelting a cumulate gabbro-rich source, as are the unique REE patterns observed." @default.
- W2094804310 created "2016-06-24" @default.
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- W2094804310 date "1990-04-01" @default.
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- W2094804310 title "Petrogenesis of mesosiderites: I. origin of mafic lithologies and comparison with basaltic achondrites" @default.
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- W2094804310 doi "https://doi.org/10.1016/0016-7037(90)90447-s" @default.
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