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Privacy Policy If your comment is published, your name will be displayed as " ". Content may be edited for style and length. For example, it's not clear to me that we need to worry about isochrons or whether U and U dates etc. So the question is what the melting points of its oxides or salts would be, I suppose. You can get any date you like depending on the assumptions you make. To date older fossils, other methods are used, such as potassium-argon or argon-argon dating. But the degree to which they are incorporated in other minerals with high melting points might have a greater influence, since the concentrations of uranium and thorium are so low.

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Anyway, this also reduces the number of data points obtained from isochrons.

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Paper spotlights key flaw in widely used radioisotope dating technique

Furthermore, I believe that mixing can also invalidate this test, since it is essentially an isochron. Others are from larger asteroids that got hot enough to melt and send lava flows to the surface. There are also processes taking place within a magma chamber that can cause differences in the composition of the magma from the top to the bottom of the chamber, since one might expect the temperature at the top to be cooler. Given isotopes are useful for dating over a range from a fraction of their half life to about four or five times their half life. Carbon dating. Let me suggest how these processes could influence uranium-lead and thorium-lead dates:

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