Earth sciences - Radiometric dating | Earth sciences - Radiometric dating |

Which element is used for radiometric dating, a response to “scientific” creationism

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Before discussing some of their claims, it is worth discussing briefly the types of radioactive decay and the evidence that decay is constant over the range of conditions undergone by the rocks available to scientists.

Potassium is Dating by default to be very mobile under leaching conditions. As the gas bubble explodes, its enclosed argon will be rushing outward along with these tiny bubbles as they cool. Radioactive decay would be faster in the bodies of stars, which is where scientists assume the heavy elements formed.

Thus, even if Slusher and Rybka were correct — which they are not — the measured age of the Earth would still exceed 4 billion years.

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Alternatively, if several different minerals can be dated from the same sample and are assumed to be formed by the same event and were in equilibrium with the reservoir when they formed, they should form an isochron. In fact, it probably rises to the top of the magma, artificially increasing its concentration there.

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Extrusive bodies are lava that is deposited on the surface. After an organism has been dead for 60, years, so little carbon is left that accurate dating cannot be established. Thus, the Earth and the atmosphere now contain about equal amounts of 40Ar, and the total could be generated if the Earth contained only ppm potassium and released half of its 40Ar to the atmosphere.

Therefore, arguments advance by Arndts and Overn 8 and by Kramer and others 78 are based on premises that are geochemically and logically unsound, and their conclusion that isochrons are due to mixing rather than to decay of 87Rb over geologic time is incorrect.

Unfortunately, Dalrymple says nothing about the calculation of the branching ratio.

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If such [excessive] ages as mentioned above are obtained for pillow lavas, how are those from deep-sea drilling out in the Atlantic where sea-floor spreading is supposed to be occurring? It is true that this can be accounted for by the fact that argon in the air has Ar36 and Ar40, whereas only Ar40 is produced by K-Ar decay.

Radiometric dating - Wikipedia

This is seismic reflection profiling, the main method of exploration used by the petroleum industry. I don't know what the exact percentage is.

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This is so low that when it undergoes isomeric transitionthe emitted gamma radiation is in the ultraviolet range.

Slusherand Rybka also claim that the evidence from pleochroic halos 6 indicates that decay rates have not been constant over time: Carbon dating is used to date things that were once living.

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Byincreased confidence in radioisotope dating techniques and the demands of evolution theory for vast amounts of time led to the establishment of an expanded geological time scale.

If these dates were true, they would seem to discredit the biblical account of a young earth of about 6, years. I doubt it very much. However, Henke admits that this can happen in some cases. T38, 4: These data cannot be used to calculate the age of the lava flows and no knowledgeable scientist would attempt to do so.

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Cross-examination The Mobility of Argon Dr. Radiometric dating is based on the fact that radioactive isotopes decay to form isotopes of different elements. Older materials can be dated using zirconapatitetitaniteepidote and garnet which have a variable amount of uranium content.

So one obtains a series of minerals crystallizing out of the lava.

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Anomalies of radiometric dating If a date does not agree with the expected age of its geologic period, and no plausible explanation can be found, then the date is called anomalous.