Early and late chondrule formation - New constraints for solar nebula chronology from Al-26/Al-27 in unequilibrated ordinary chondrites

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Solar Corona, Chondrule, Aluminum 26, Aluminum 27, Chondrites, Meteoritic Composition, Constraints, Chronology, Solar System Evolution, Minerals

Scientific paper

As part of our continuing effort to better constrain the distribution and abundance of Al-26 in the early solar system, we have identified and measured Mg-Al isotopic systematics in two new CAIs and four new Al-rich chondrules from the unequilibrated ordinary chondrites, Semarkona, Moorabie, and Chainpur. All of the chondrules contain either clear, isotropic, Al-rich glass or calcic plagioclase that is clearly of igneous, not metamorphic, origin.

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