Determining garnet crystallization kinetics from growth zoning and Mn-calibrated Sm-Nd ages

Rose Bloom
By working under the assumption that garnet strongly fractionates Mn, the change in measured XMn from the core to rim of a garnet can be used to represent the progression of time since nucleation. Core, mantle, and rim zones from nine snowball garnets collected at the Pinney Hollow Formation, Townshend Dam, VT were analyzed using electron probe microanalysis (EPMA) as well as Sm/Nd isotopic methods. Two-point garnet-matrix Sm/Nd ages are complex, with some showing apparent...
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