Calcium isotope abundance ratios (44Ca/42Ca and 43Ca/42Ca) were measured using a multicollector ICP-MS (Neptune Plus, Thermo Fisher Scientific) following previously described methods (9, 16, 18, 19, 33). After purification, Ca samples were dissolved in ultrapure 0.05 M HNO3, and Ca concentration was set at 1.5 ppm for all samples and standards. All Ca isotope compositions were expressed using the “delta” notation defined as follows for the 44Ca/42Ca ratioδC44/42a=[(C44a/C42a)sample(C44a/C42a)ICP Ca Lyon1]×1000where (44Ca/42Ca)sample and (44Ca/42Ca)ICP Ca Lyon are the Ca isotope abundance ratios measured in sample and ICP Ca Lyon reference standard, respectively. The ICP Ca Lyon standard, used as a bracketing standard, was a Specpure Ca plasma standard solution (Alfa Aesar) as previously described (9, 16, 18, 19, 33).

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