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Modeling of the temperature sensitivity of the apatite (U-Th)/He thermochronometer. Helium diffusion and low-temperature thermochronometry of apatite. Helium is produced within apatite grains as a result of alpha decay from uranium and thorium isotopes, present as impurities at ppm levels. (1994), this process formed the basis of the first attempts at geochronology (Rutherford, 1907a). Rutherford, 1907b) that at least a fraction of radiogenic Helium was lost from the host crystal lattice, and with the advent of apparently more reliable methods of geochronology (e.g. K-Ar, Rb-Sr, U-Pb), interest in the Helium systematics of minerals waned. Assessment of (U-Th)/He thermochronometry: the low temperature history of the San Jacinto mountains, California.
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However, effects related to grain size may be significant in the interpretation of apatites from sediments which have been heated to paleotemperatures within the He PRZ, as grains of different radii will give different ages for a particular thermal history. The effects of long alpha-stopping distances on (U-Th)/He ages.
While this has yet to be demonstrated in natural samples, this holds considerable promise for obtaining more precise thermal history control in sedimentary basins. Ken Farley of Caltech, based on the systematics presented in Farley (2000) and references therein, allows modelling of the (U-Th)/He age expected from any inputted thermal history, in grains of any specified radius.
A number of subsequent applications of the method (e.g. (Uranium thorium)/helium dating of apatite: experience with samples from different geochemical environments.
House et al., 1997; Warnock et al., 1997; Wolf et al., 1997) have illustrated the potential of the technique to provide useful thermochronometric information at temperatures less than 100C. Chemical Geology (Isotope Geoscience Section), 112, 179-191.
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By modelling ages through a variety of different thermal history scenarios, it is possible to define the range of histories giving predictions which are consistent with measured ages.