Compositional-Petrologic Investigation of Quench-Textured Eucrites: Microporphyritic ALH 81001 and Vesicular PCA 91007

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Meteoritic Composition, Mineralogy, Cosmochemistry, Meteorites, Neutron Activation Analysis, Electron Probes

Scientific paper

We have studied bulk compositions and mineralogy of several unusual eucrites. Bulk compositions were determined using standard UCLA methods: Instrumental Neutron Activation Analysis (INAA), RNAA (Ni, Zn, Ge, Cd, Re, Os, Ir, and Au), and fused-bead Electron Probe Microanalysis (EPMA) (major elements + Ti). Mineral compositions were studied using EPMA at the University of Tokyo. Samples for which RNAA data have been acquired include ALH 81001, EET 87548, LEW 86002, LEW 87010, RKP 80204, RKP 80224, Y 791186, Y 791195, and Y 82037, and also the polymict eucrites EET 79005, LEW 87004, LEW 87026, and LEW 87295.

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