Computer Science
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..51...29m&link_type=abstract
Earth and Planetary Science Letters, vol. 51, no. 1, Nov. 1980, p. 29-40.
Computer Science
21
Meteoritic Composition, Olivine, Siderites, Breccia, Electron Probes, Geochemistry, Mineralogy, Neutron Activation Analysis, Meteorites, Pallasites, Clasts, Olivines, Mesosiderites, Origin, Data, Composition, Emery Meteorite, Mincy Meteorite, Pinnaroo Meteorite, Inaa, Analysis, Electron Microprobe, Brenham Meteorite, Melting, Source Medium, Models, Parent Bodies, Dunite, Metals, Fractional Crystallization, Heat, Samples, Experiments, Procedure, Comparisons, Cooling Rate, Formation, Exposure Ages
Scientific paper
The composition of olivine clasts from the mesosiderites Emery, Mincy and Pinnaroo is investigated, and implications of the results for the origin of the pallasites, which, although chemically distinct, may be related to the diogenites, eucrites, howardites and mesosiderites, are discussed. Centimeter-sized olivines were analyzed by electron microprobe, and instrumental neutron activation analysis was performed on one olivine each from Emery and Pinnaroo and an olivine separate from the Brenham pallasite. The olivine compositions are found to range from Fa8 to Fa28, with Emery samples having values from Fa18 to Fa28, and to require essentially total melting of a source composition rich enough in FeO to produce basaltic clasts. It is argued that the mesosiderite olivines were formed in the outer few kilometers of their parent body, as were those of the pallasites, which have the same compositions as the mesosiderite olivines. A model is then developed for the origin of the pallasites as a by-product of igneous differentiation in the external heating of a chondritic parent body.
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