Partial melting of the Allende (CV3) meteorite - Implications for origins of basaltic meteorites

Details Partial melting of the Allende (CV3) meteorite - Implications for origins of basaltic meteorites Partial melting of the Allende (CV3) meteorite - Implications for origins of basaltic meteorites

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...252..695j&link_type=abstract

Science (ISSN 0036-8075), vol. 252, May 3, 1991, p. 695-698.

Computer Science

27

Allende Meteorite, Carbonaceous Chondrites, Melting, Meteoritic Composition, Oxidation-Reduction Reactions, Electron Microscopy, Eutectics, Phase Transformations, Meteorites, Stony Meteorites, Chondrites, C Chondrites, Cv3 Chondrites, Allende, Basalt, Partial Melting, Origin, Formation, Eucrites, Melts, Angrites, Oxygen, Fugacity, Pressure, Oxidation, Reduction, Texture, Parent Bodies, Composition, Size, Depth, Laboratory Studies, Magma, Experiments, Samples, Meteorite, Antarctic Meteorites, Lew Meteorites,

Scientific paper

Eucrites and angrites are distinct types of basaltic meteorites whose origins are poorly known. Experiments in which samples of the Allende (CV3) carbonaceous chondrite were partially melted indicate that partial melts can resemble either eucrites or angrites, depending only on the oxygen fugacity. Melts are eucritic if this variable is below that of the iron-wuestite buffer or angritic if above it. With changing pressure, the graphite-oxygen redox reaction can produce oxygen fugacities that are above or below those of the iron-wuestite buffer. Therefore, a single, homogeneous, carbonaceous planetoid greater than 110 kilometers in radius could produce melts of drastically different composition, depending on the depth of melting.

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