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Thermal ionization mass spectrometry (TIMS) was used to measure the calcium isotopic compositions of carbonaceous, ordinary, enstatite chondrites as well as eucrites and aubrites. We find that after correction for mass-fractionation by internal normalization to a fixed 42 Ca/ 44 Ca ratio, the 43 Ca/ 44 Ca and 46 Ca/ 44 Ca ratios are indistinguishable...
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