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Therefore, when you calculate the (U-Th)/He age of a rock or mineral, you are in effect calculating the time that has elapsed since the system switched from open (hot) to closed (cool) behavior.
This new technique allows further refinement of Geotracks THR methods, providing: (U-Th)/He dating, developed and proven by Professor Ken Farley of Caltech, is based on the accumulation and diffusive loss of Helium produced by alpha decay of Uranium and Thorium impurities within apatite grains.
By measurement of the amount of radiogenic He in an apatite sample, and the amounts of uranium and thorium present, a (U-Th)/He age can be determined (see reverse).
These ages are progressively reset by heating, due to the diffusive loss of the radiogenic helium (analogous to the annealing of fission tracks), with total loss occurring at temperatures around 80 to 90C (for timescales involving millions of years).
Particularly when integrated with information from AFTA and other thermal indicators (e.g. (Uranium thorium)/helium dating of apatite: experience with samples from different geochemical environments.
Check out this new entry describing how to pick and select apatites for (U-Th)/He Thermochronology!
At CU we are equipped to measure (U-Th)/He ages on a variety of materials, and are always interested in pursuing new research directions developing new collaborative relationships.
God’s Word clearly teaches that the earth is young, and the evidence powerfully confirms it.
So don’t miss this issue of Answers, which brings you up to speed on the ten best evidences for a young earth.
Due to the well-established diffusion law of physics, gases always diffuse from areas of higher concentration to surrounding areas of lower concentration.9 Another critic suggested the edges of the zircon crystals must have stopped the helium from leaking out, effectively “bottling” the helium within the zircons.
However, this postulation has also been easily refuted because the zircon crystals are wedged between flat mica sheets, not wrapped in them, so that helium could easily flow between the sheets unrestricted.10 All other critics have been answered.11 Thus all available evidence confirms that the true age of these zircons and their host granitic rock is only 6,000 (± 2,000) years.