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tokens: We are deeply grateful to Patrick Boehnke for his contributions to the CHILI measurements and for helpful discussions. The manuscript benefited significantly from very detailed and constructive comments by an anonymous reviewer. We also acknowledge Roberto Gallino for his adept remarks. We thank Elmar Gröner for technical support on the NanoSIMS. This work was supported by NASA (grants NNX15AF78G, 80NSSC17K0250, and 80NSSC17K0251 to A.M.D.). LLNL-JRNL-768104.