Abstract
Ca–Al-rich objects, hitherto mostly found in carbonaceous chondrites, are shown to be widespread, albeit rare, constituents of type 3 ordinary chondrites. Widespread occurrence and textural similarities of Ca–Al-rich chondrules to common, Mg–Fe-rich chondrules suggest that they formed by related processes. It is suggested in this article that Ca–Al-rich chondrules were formed by total melting and crystallization of heterogeneous, submillimetre- to millimetre-sized dustballs made up of mixtures of high-temperature, Ca–Al-rich and lower-temperature, Na–K-rich components.
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Bischoff, A., Keil, K. Ca–Al-rich chondrules and inclusions in ordinary chondrites. Nature 303, 588–592 (1983). https://doi.org/10.1038/303588a0
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DOI: https://doi.org/10.1038/303588a0
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