Uranium lead dating problems

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Radiometric Dating — Is It Accurate?

Kevin Rogers submitted a comment to that article reproduced below, edited to focus on substantive issues , to which Dr Jim Mason replies. Andrew Kulikovsky spoke on one occasion and John Hartnett spoke on 2 occasions. However, we are a house divided. It can be experimentally confirmed that molten Zircon rejects lead. This is highly significant, as it means that the initial conditions are known to a high level of confidence. Jim Mason made no reference to the Concordia line and I could not find any reference to the Concordia line on any articles on the CMI website, even though it is well known e. Jim raised the issue of Helium concentrations in Zircon.

Uranium-lead U-Pb dating is a staple of the billions-of-years claims about igneous and metamorphic rocks and meteorites — giving rise to the consensus age of the solar system at 4. Still, he finds it troubling that there should be any discordance if the same physical processes are operating for the same amount of time. At the beginning of the article, he quoted T. The progress in developments of the U-Pb method is both a history of technical discoveries and advances, as well as a history of a long struggle toward concordance , toward an understanding of the causes of discordance , and toward ways to eliminate it. Despite the enormous progress achieved in this field, the problems of U-Pb discordance have not yet been completely resolved and will be one of the main hurdles to overcome in the future. The paper is technical, so detailed evaluation of the contents should be left to geophysicists. The following quotes give a sense of the kinds of problems Corfu discussed, and their implications.

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See also Counterexamples to an Old Earth. Radiometric dating is a method of determining the approximate age of an artifact by measuring the amount of radioactive decay that has occurred. Radiometric dating requires careful analysis and control over the isotopic mix of atoms in the original sample, as well as careful analysis and control of factors e. These difficulties are considerable, and are discussed below. It also requires knowledge of the rates at which various isotopes decay.

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RADIOMETRIC TIME SCALE

Here I want to concentrate on another source of error, namely, processes that take place within magma chambers. To me it has been a real eye opener to see all the processes that are taking place and their potential influence on radiometric dating. Radiometric dating is largely done on rock that has formed from solidified lava. Lava properly called magma before it erupts fills large underground chambers called magma chambers. Most people are not aware of the many processes that take place in lava before it erupts and as it solidifies, processes that can have a tremendous influence on daughter to parent ratios.

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