Petrology of igneous lithic clasts from polymict eucrites ALHA76005 and ALHA77302

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Achondrites, Meteoritic Composition, Petrology, Electron Probes, Igneous Rocks, Ilmenite, Photomicrographs, Pyroxenes, Silicon Dioxide, Troilite, Meteorites, Antarctic Meteorites, Allan Hills Meteorites, Alha76005, Petrology, Clasts, Eucrites, Alha77302, Samples, Meteorite, Iron, Petrography, Electron Microprobe, Comparisons, Mineralogy, Silica, Nickel, Pyroxene, Plagioclase, Ilmenite, Troilite, Composition, Modal Analysis, Crystallization, Formation, Fractionation

Scientific paper

A total of seven lithic clasts from the polymict eucrites ALHA76005 and ALHA77302 have been studied petrographically and analyzed with the electron microprobe. All clasts are composed predominantly of pyroxene and plagioclase, + or - ilmenite, troilite, Fe-Ni metal, mesostasis, and silica. Pyroxene compositions in unequilibrated clasts and clast bulk compositions, calculated by modal recombination, indicate that the clasts originally crystallized under similar conditions and that they may be genetically related to each other by fractionation of pigeonite and plagioclase.

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