Proof radiometric dating accuracy
Essentially all of these strongly favor an old Earth. And since this agreement is the strongest argument for the reliability of radiometric dating, such an assumption of agreement appears to be without support so far. A Rb-Sr isochron yielded a date of 34 billion years. And faster cooling could increase the ages by further large factors. The crucial determiners are therefore volcanic extrusive igneous rocks that are interbedded with sediments, and intrusive igneous rocks that penetrate sediments. This lava will take longer to cool down, giving more opportunity for enclosed argon to escape and leading to younger radiometric ages. As these rocks absorb argon, their radiometric ages would increase. No one has measured the decay rates directly; we only know them from inference. The precambrian rock is less interesting because it could have a radiometric age older than life, but this is less likely for the rest of the geologic column.
There are at least a couple of mechanisms to account for this. In one specific case, samples were taken from the Cardenas Basalt, which is among the oldest strata in the eastern Grand Canyon. If we walk into a room and observe an hourglass with sand at the top and sand at the bottom, we could calculate how long the hourglass has been running. Consider the list of all known radioactive isotopes with half-lives of at least one million years but less than one quadrillion years, and which are not themselves produced by any natural process such as radioactive decay or cosmic ray bombardment [ Nuclides ]: By Eric Hovind on May 5, in Articles , Beginner Whenever the worldview of evolution is questioned, the topic of carbon dating always comes up. Here is another quote from Woodmorappe about isochrons, since some people think that mixing scenarios or other age-altering scenarios are unlikely: This would probably have a larger effect lower down, where the pressure of argon would be higher. One example is the rocks from the Kaupelehu Flow, Hualalai Volcano in Hawaii which was known to have erupted in The so-called geologic column was developed in the early s over a century before there were any radio- metric dating methods. Rates of radioactivity One question that sometimes arises here is how can scientists assume that rates of radioactivity have been constant over the great time spans involved. Vast amounts of data overwhelmingly favor an old Earth. The question is, what percentage of isochrons are super-isochrons, and how do their dates agree with the conventional dates for their geologic period? We scientists who measure isotope ages do not rely entirely on the error estimates and the self-checking features of age diagnostic diagrams to evaluate the accuracy of radiometric ages. It had been noted that some minerals which yield such dates as beryl, cordierite, etc. Another factor is that rocks absorb argon from the air. In addition, the rapid cooling and the process of formation means that these beads would have Rb, Sr, U, and Pb concentrations the same as the lava they came from, since there is no chance for crystals to form with such rapid cooling. It is very easy to calculate the original parent abundance, but that information is not needed to date the rock. Then this varying mixture of A and B, with all A at 0 and all B at 1, produces a good isochron. That is, we can get both parent and daughter elements from the magma inherited into minerals that crystallize out of lava, making these minerals look old. The rapid cooling might mean that any enclosed argon is retained, but if not, the fact that this cooling occurs near the volcano, with a lot of argon coming out, should guarantee that these beads would have excess argon. Again, the percentage of anomalies means nothing for the reliability of radiometric dating. And let me recall that both potassium and argon are water soluble, and argon is mobile in rock. In order to have a level of confidence in dating, different radioisotope methods used to date a rock sample should closely coincide in age. The number of dates that disagree with the expected ages is not insignificant. In each case, the isochron dates differed substantially from the single-sample radioisotope dates. One would assume that initially, the concentration of Z and Y are proportional, since their chemical properties are very similar.
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