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- W2034453457 abstract "We have carried out a detailed petrographic and mineralogical study of carbonaceous chondrite matrix clasts in the Nilpena polymict ureilite. The bulk compositions of a number of clasts, determined by electron microprobe, show that they have close affinities to CI chondrite matrix and differ substantially from CM matrix material. Transmission electron microscopy studies show that the mineralogy of the clasts is also consistent with CI chondrite matrix, indicated by the presence of saponitic smectite clays, serpentine, magnetite, pentlandite, pyrrhotite, and ferrihydrite. Phases such as tochilinite and cronstedtite, diagnostic of CM matrix, are absent. Based on the oxygen isotopic composition of the matrix, the phase chemistry, and the bulk clast chemistry, we suggest that the matrix clasts in Nilpena represent material which is less altered than Orgueil. The difference in oxygen isotopic composition of the Nilpena matrix clasts from CI chondrites may be because the clasts underwent alteration at a lower water/rock ratio. Increased alteration of Nilpena-type material should result in the oxidation of Fe-bearing saponite and sulfides to produce ferrihydrite and more Mg-rich saponite, such as that in Orgueil matrix. Although the presence of CI-like matrix clasts in the polymict ureilites suggests that CI matrix may have been a precursor to the ureilites, in detail this seems highly unlikely. The trace element and carbon isotopic compositions of ureilites are incompatible with a significant CI chondrite precursor. We suggest that the CI-like matrix clasts in Nilpena represent a component of a late-accreting veneer on the ureilite parent body." @default.
- W2034453457 created "2016-06-24" @default.
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- W2034453457 date "1992-03-01" @default.
- W2034453457 modified "2023-10-18" @default.
- W2034453457 title "CI chondrite-like clasts in the Nilpena polymict ureilite: Implications for aqueous alteration processes in CI chondrites" @default.
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- W2034453457 doi "https://doi.org/10.1016/0016-7037(92)90068-t" @default.
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