Grand canyon radiometric dating

Grand canyon radiometric dating


One study found some correlated dates from bentonite that are used to estimate the date of the K-T boundary. One of the best ways to measure farther back in time than tree rings is by using the seasonal variations in polar ice from Greenland and Antarctica. And as I said above, I'm also interested to know how much of the fossil-bearing geologic column can be dated by isochrons, and how the dates so obtained compare to others. Argon diffuses from mineral to mineral with great ease. But since these multiple mixing tests are more difficult and expensive, they may not be done very often. Many dates give values near the accepted ones. Potassium 40 K40 decays to argon 40, which is an inert gas, and to calcium. This argon will tend to deposit on the surface of minerals, but with the passage of time it will tend to diffuse into the interior, even if only a very small distance. And even for this one, the results were not very good. Two of the most frequently-used of these "uranium-series" systems are uranium and thorium The last three points deserve more attention. Indeed, there are a number of conditions on the reliability of radiometric dating. It is difficult to find continuous tree ring records through this period of rapid climate change. By comparison of the amount of light emitted with the natural radioactivity rate the sample experienced, the age of the sample can be determined. It is possible that in some cases an isochron might be able to detect such initial argon 40, but this can only happen if the potassium concentration varies significantly within the sample. Concerning excess argon, Faure , p. Recent lava flows often yield K-Ar ages of about , years. If they contained a hundred times more excess argon, their K-Ar ages would be a hundred times greater, I suppose. Here is some relevant information that was e-mailed to me. Each growth ring only collects carbon from the air and nutrients during the year it is made. Comparison of uranium ages with ages obtained by counting annual growth bands of corals proves that the technique is page. We can also consider the average abundance of argon in the crust. Significant quantities of argon may be introduced into a mineral even at pressures as low as one bar. Even the creationist accounts that I have read do not adequately treat these issues. Not knowing if anomalies are always published makes this harder. Here is one such reference, although this is to a mineral that does not exclude argon: A continuous count of layers exists back as far as , years.

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Grand canyon radiometric dating

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How Creationism Taught Me Real Science 17 Radiometric Dating




He admits that Slusher's statements about it would have been true in the 's and early 's, but are no longer true. Thus crystals, as they form, may have tiny imperfections that accept parent and daughter products in the same ratios as they occur in the lava, so one can inherit ages from the lava into minerals in this way. This shows that rocks can adsorb a large amount of argon relative to the argon needed to give them old K-Ar ages, and also suggests that old K-Ar ages can be produced by external argon from the mantle. However, it's clear from Strahler , Dalrymple , etc. Furthermore, some elements in the earth are too abundant to be explained by radioactive decay in 4. Rather, the offset is equal to one half-life, or 5, years for carbon 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. It's not surprising that K-Ar dates often agree with the assumed dates of their geological periods, since the dates of the geological periods were largely inferred from K-Ar dating. As one goes further down in the ice core, the ice becomes more compacted than near the surface, and individual yearly layers are slightly more difficult to observe. The decay constant and the abundance of K40 must be known accurately. Slusher asserted that the best known value of the branching ratio was not always used in computing K-Ar radiometric ages. The mathematics for determining the ages from the observations is relatively simple.

Grand canyon radiometric dating


One study found some correlated dates from bentonite that are used to estimate the date of the K-T boundary. One of the best ways to measure farther back in time than tree rings is by using the seasonal variations in polar ice from Greenland and Antarctica. And as I said above, I'm also interested to know how much of the fossil-bearing geologic column can be dated by isochrons, and how the dates so obtained compare to others. Argon diffuses from mineral to mineral with great ease. But since these multiple mixing tests are more difficult and expensive, they may not be done very often. Many dates give values near the accepted ones. Potassium 40 K40 decays to argon 40, which is an inert gas, and to calcium. This argon will tend to deposit on the surface of minerals, but with the passage of time it will tend to diffuse into the interior, even if only a very small distance. And even for this one, the results were not very good. Two of the most frequently-used of these "uranium-series" systems are uranium and thorium The last three points deserve more attention. Indeed, there are a number of conditions on the reliability of radiometric dating. It is difficult to find continuous tree ring records through this period of rapid climate change. By comparison of the amount of light emitted with the natural radioactivity rate the sample experienced, the age of the sample can be determined. It is possible that in some cases an isochron might be able to detect such initial argon 40, but this can only happen if the potassium concentration varies significantly within the sample. Concerning excess argon, Faure , p. Recent lava flows often yield K-Ar ages of about , years. If they contained a hundred times more excess argon, their K-Ar ages would be a hundred times greater, I suppose. Here is some relevant information that was e-mailed to me. Each growth ring only collects carbon from the air and nutrients during the year it is made. Comparison of uranium ages with ages obtained by counting annual growth bands of corals proves that the technique is page. We can also consider the average abundance of argon in the crust. Significant quantities of argon may be introduced into a mineral even at pressures as low as one bar. Even the creationist accounts that I have read do not adequately treat these issues. Not knowing if anomalies are always published makes this harder. Here is one such reference, although this is to a mineral that does not exclude argon: A continuous count of layers exists back as far as , years.

Grand canyon radiometric dating


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3 thoughts on “Grand canyon radiometric dating

  1. It only differs in degree. But anyway, I think it is important really to know what patterns appear in the data to try to understand if there is a correlation and what could be causing it.

  2. Well, the situation is very similar for the dating of rocks, only we have rock records rather than historical records.

  3. Vast amounts of data overwhelmingly favor an old Earth. It does not answer the overall question.

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