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    Zircon fission track dating humphreys

    These two independent and agreeing dating methods for of the age of two primary members of the solar system formed a strong case for the correctness of his answer within the scientific community.This just goes to show that just because independent estimates of age seem to agree with each other doesn't mean that they're correct - despite the fact that this particular argument is the very same one used to support the validity of radiometric dating today.A final step of cooling (from 25 Ma), exhibited by some of the thermal history models, may reflect reactivation of the ISZ and initiation of Cenozoic Altai mountain building.The Late Plio-Pleistocene phase of mountain building coincides with a new change in the Palaeostress field, characterized by minor transpressional, right-lateral shear conditions.The Irtysh shear zone (ISZ) is an important structure in the framework of the Central Asian Orogenic Belt (CAOB).It represents the site of final collision of Kazakhstan with Siberia during Hercynian times and records up to 1000 km of lateral displacement during subsequent reorganization in the CAOB edifice.

    When physicist Dr Russell Humphreys was still at Sandia National Laboratories (he now works full-time for ICR), he and Dr John Baumgardner (still with Los Alamos National Laboratory) were both convinced that they knew the direction in which to look for a definitive answer to the puzzle of why radiometric dating consistently gives ages of millions and billions of years.U, is the only naturally occurring isotope with a fission half-life sufficiently short to produce a significant number of fission tracks through geologic time.Uranium occurs in trace amounts in many minerals, and, because the spontaneous fission of U occurs at a known rate, it is possible to calculate the age of a mineral by determining the number of fission tracks and the amount of uranium it contains.If a mineral containing fission tracks is heated to a high enough temperature, however, the fission tracks will fade and disappear, resulting in a low apparent fission-track age.The temperature at which this fading, or “annealing,” occurs depends on the mineral and the duration of heating.

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