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The magnesium isotopic compositions of 43 hibonite-bearing inclusions extracted from CM2 meteorites Murchion and Paris were measured with a Cameca 1280 HR2 ion microprobe. The results are broadly consistent with the literature data: most Spinel–HIBonite spherules (SHIBs) bear evidence for in situ decay of 26 Al at the canonical level, whereas PLAty–hibonite Crystals (PLACs) either lack resolvable...
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