Limitations of radioactive age dating

Limitations of radioactive age dating


Mechanism of uranium crystallization and falling through the magma We now consider in more detail the process of fractionation that can cause uranium to be depleted at the top of magma chambers. Even in recent times, hundreds of measurements of 'c' since show a small but statistically significant decrease i. Sialic granitic and mafic basaltic magma are separated from each other, with uranium and thorium chemically predestined to reside mainly in sialic magma and less in mafic rock. Clearly, this seems incompatible with an ocean billions of years old. But this would be less so for lead, which reacts less strongly, and probably is not incorporated so easily into minerals. So, rather than 'c' being constant with time, it has been proposed that the product 'hc' where here 'h' is Planks Constant and 'c' is the speed of light in a vacuum should be considered constant, see Setterfield. Concerning the distribution of parent and daughter isotopes in various substances, there are appreciable differences. Earth's Magnetic Field The Earth's magnetic field is thought to arise from circulating electic currents in the Earth's molten metalic core, and scientists agree that the field is weakening. In the course of partial melting and fractional crystallization of magma, U and Th are concentrated in the liquid phase and become incorporated into the more silica-rich products. Some information from the book Uranium Geochemistry, Mineralogy, Geology provided by Jon Covey gives us evidence that fractionation processes are making radiometric dates much, much too old. These basalts yield ages of up to 1 million years based on the amounts of potassium and argon isotopes in the rocks. Isochrons require more measurements than single parent-to-daughter ratios, so most dates are based on parent-to-daughter ratios. Let us consider processes that could cause uranium and thorium to be incorporated into minerals with a high melting point. Lead has a low melting point, so it will melt early and enter the magma. Scientific Debate Earth dating via ocean sediments, magnetic field decay, atmospheric helium, short-period comets and other techniques point to a young earth. He says, these flows should have slopes approaching zero less than 1 million years , but they instead appear to be much older million years. A few years ago I took a course in the "Evolution of Desert Environments". It is possible that the reason is that uranium-lead dates so rarely agree with the correct dates. Magma from melted continental material probably has more of both U and U and lead and lead Geologists assert that older dates are found deeper down in the geologic column, which they take as evidence that radiometric dating is giving true ages, since it is apparent that rocks that are deeper must be older. On the upper left branch of this reaction series, olivine, the first mineral to form, Ml] react with the remaining melt to become pyroxene. Let me make some general comments about isochrons. Still, the creationist task is not finished by proposing all of these mechanisms for invalidating radiometric dating. Our massive consumption of fossil fuels is releasing the carbon which has been locked up in the Earth's crust for the last four or five millennia. This implies the earth is at least 20 million years old. It's interesting that isochrons depend on chemical fractionation for their validity.

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Limitations of radioactive age dating

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Radioactive Dating




So, rather than 'c' being constant with time, it has been proposed that the product 'hc' where here 'h' is Planks Constant and 'c' is the speed of light in a vacuum should be considered constant, see Setterfield. Further, most minerals of uranium and thorium are denser than other minerals, especially when those minerals are in the liquid phase. I would also mention that there are some parent-to-daughter ratios and some isochrons that yield ages in the thousands of years for the geologic column, as one would expect if it is in fact very young. We will assume that this tree also lived for years before it was cut down. In these instances, the feldspar crystals will have calcium-rich interiors surrounded by zones that are progressively richer in sodium. Initially, we would expect most of it to come from subducted oceanic plates, which are uranium and thorium poor and maybe lead rich. Also, the fact that there are two kids of magma could mean that the various radiometric ages are obtained by mixing of these kinds of magma in different proportions, and do not represent true ages at all. It would really be nice if geologists would just do a double blind study sometime to find out what the distributions of the ages are. At any stage in the crystallization process the melt might be separated from the solid portion of the magma. The point is that they are heavier than the magma. Thus we need to have an uneven distribution of D relative to N at the start. Then we require some process to preferentially concentrate the parent substances in certain places. As the plume rises it melts and incorporates other crustal rocks. People should read John Woodmorappe's articles on radiometric dating to see some of the anomalies. Nevins, Institute for Creation Research ].

Limitations of radioactive age dating


Mechanism of uranium crystallization and falling through the magma We now consider in more detail the process of fractionation that can cause uranium to be depleted at the top of magma chambers. Even in recent times, hundreds of measurements of 'c' since show a small but statistically significant decrease i. Sialic granitic and mafic basaltic magma are separated from each other, with uranium and thorium chemically predestined to reside mainly in sialic magma and less in mafic rock. Clearly, this seems incompatible with an ocean billions of years old. But this would be less so for lead, which reacts less strongly, and probably is not incorporated so easily into minerals. So, rather than 'c' being constant with time, it has been proposed that the product 'hc' where here 'h' is Planks Constant and 'c' is the speed of light in a vacuum should be considered constant, see Setterfield. Concerning the distribution of parent and daughter isotopes in various substances, there are appreciable differences. Earth's Magnetic Field The Earth's magnetic field is thought to arise from circulating electic currents in the Earth's molten metalic core, and scientists agree that the field is weakening. In the course of partial melting and fractional crystallization of magma, U and Th are concentrated in the liquid phase and become incorporated into the more silica-rich products. Some information from the book Uranium Geochemistry, Mineralogy, Geology provided by Jon Covey gives us evidence that fractionation processes are making radiometric dates much, much too old. These basalts yield ages of up to 1 million years based on the amounts of potassium and argon isotopes in the rocks. Isochrons require more measurements than single parent-to-daughter ratios, so most dates are based on parent-to-daughter ratios. Let us consider processes that could cause uranium and thorium to be incorporated into minerals with a high melting point. Lead has a low melting point, so it will melt early and enter the magma. Scientific Debate Earth dating via ocean sediments, magnetic field decay, atmospheric helium, short-period comets and other techniques point to a young earth. He says, these flows should have slopes approaching zero less than 1 million years , but they instead appear to be much older million years. A few years ago I took a course in the "Evolution of Desert Environments". It is possible that the reason is that uranium-lead dates so rarely agree with the correct dates. Magma from melted continental material probably has more of both U and U and lead and lead Geologists assert that older dates are found deeper down in the geologic column, which they take as evidence that radiometric dating is giving true ages, since it is apparent that rocks that are deeper must be older. On the upper left branch of this reaction series, olivine, the first mineral to form, Ml] react with the remaining melt to become pyroxene. Let me make some general comments about isochrons. Still, the creationist task is not finished by proposing all of these mechanisms for invalidating radiometric dating. Our massive consumption of fossil fuels is releasing the carbon which has been locked up in the Earth's crust for the last four or five millennia. This implies the earth is at least 20 million years old. It's interesting that isochrons depend on chemical fractionation for their validity.

Limitations of radioactive age dating


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