Diffusion Kinetics of Samarium and Neodymium in Garnet, and a Method for Determining Cooling Rates of Rocks

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Science  07 Aug 1998:
Vol. 281, Issue 5378, pp. 805-807
DOI: 10.1126/science.281.5378.805

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Experimental determinations of the diffusion coefficients of samarium and neodymium in almandine garnet and theoretical considerations show that one cannot assign a sufficiently restricted range of closure temperature, T C, to the samarium-neodymium decay system in garnet for the purpose of constraining the cooling rate. However, it is shown that the samarium-neodymium cooling age of garnet can be used to calculate both cooling rate and T C if the temperature and age at the peak metamorphic conditions are known.

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