High-temperature inclusions in the Murchison meteorite

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Carbonaceous Chondrites, Geochemistry, Inclusions, Meteoritic Composition, Mineralogy, Refractory Materials, Aluminum Oxides, Chemical Analysis, Crystallography, Electron Microscopy, Solar Corona, Spinel

Scientific paper

Inclusions found in type 3 carbonaceous chondrites such as the Allende meteorite are described and compared with those in the Murchison type 2 carbonaceous chondrite. Scanning electron microscope studies of the SH-6 (containing abundant hibonite) and the GR-1 (containing abundant hibonite and corundum) are discussed. Because corundum and hibonite are higher temperature condensates than the melilite and pyroxene found in the Allende meteorite, it is concluded that most refractory inclusions in the Murchison meteorite were isolated from the solar nebular gas at a higher temperature than their counterparts in the Allende meteorite. Whether the inclusion crystallized from a liquid or condensed directly from solar nebular gas is discussed.

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