Many thermochronology studies focus on extracting the thermal history of a sample using fission-track length distributions and track annealing models (e.g., Ketcham 2005, and references therein). Recent developments in measuring the 3He/4He concentration profile across apatite grains (e.g., Shuster and Farley 2005) offer a new approach for quantifying sample cooling histories over a broader range of temperatures with the (U-Th)/He system. The motivation behind calculating thermal histories from thermochronometer data has traditionally been to date events such as the onset of exhumation or fault motion, erosion, or for quantifying hydrocarbon maturation in sedimentary basins. The...

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