Refractory spherules in the Murchison meteorite - Are they condrules

Mathematics – Logic

Scientific paper

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Carbonaceous Chondrites, Chondrule, Inclusions, Meteoritic Composition, Mineralogy, Refractory Materials, Spherules, Chemical Composition, Evolution (Development), Microstructure, Textures, Meteorites, Spherules, Murchison Meteorite, Chondrules, Refractivity, Carbonaceous Chondrites, Inclusions, Shape, Texture, Liquids, Data, Formation, Melting, Condensation, Composition, Petrography, Mineralogy

Scientific paper

The textural and mineralogical features of refractory spherules found in the Murchison meteorite are examined in relation to their probable origin. Based on a study of 12 samples it is found that the refractory spherules, with hibonite-bearing or spinel or spinel-perovskite cores surrounded by an iron-rich silicate layer, have compositions similar to those of coexisting irregular inclusions. The shape and internal textures of the spherules, however, suggest formation from a liquid. It is proposed that the spherules may be melted equivalents of the irregular inclusions, and thus may be properly termed chondrules. It is noted that such melting would have involved very high temperatures.

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