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Science 7 August 1998:
Vol. 281. no. 5378, pp. 805 - 807
DOI: 10.1126/science.281.5378.805
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Reports

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

J. Ganguly, M. Tirone, R. L. Hervig

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, TC, 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 TC if the temperature and age at the peak metamorphic conditions are known.

J. Ganguly and M. Tirone, Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA. R. L. Hervig, Center for Solid State Science, Arizona State University, Tempe, AZ 85287, USA.

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