Uranium Dating Problems

Uranium-Lead Radioisotope Dating Problems | Answers in Genesis
Radiometric Dating: Problems with the Assumptions . . .
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One of the (many) assumptions in radiometric dating , and specifically for U-Pb dating , is that most of the three lead (Pb) isotopes we see on earth (206 Pb, 207 Pb and 208 Pb)—which today are produced by radiometric decay of Uranium (U), Thorium (Th), Actinium (Ac) and several other elements with radioactive isotopes—were derived in the past only from radiometric decay of these elements . This is a completely arbitrary and unprovable assumption presupposing a naturalistic evolutionary . . .
The problems with contamination, as with inheritance, are already well-documented in the textbooks on radioactive dating of rocks .7 Unlike the hourglass, where its two bowls are sealed, the radioactive "clock" in rocks is open to contamination by gain or loss of parent or daughter isotopes because of waters flowing in the ground from rainfall and from the molten rocks beneath volcanoes . Similarly, as molten lava rises through a conduit from deep inside the earth to be erupted through a . . .
Lead atoms created by uranium decay are trapped in the crystal and build up in concentration with time . If nothing disturbs the grain to release any of this radiogenic lead, dating it is straightforward in concept . In a 704-million-year-old rock, 235U is at its half-life and there will be an equal number of 235U and 207Pb atoms (the Pb/U ratio is 1) .
Here is yet another mechanism that can cause trouble for radiometric dating : As lava rises through the crust, it will heat up surrounding rock . Lead has a low melting point, so it will melt early and enter the magma . This will cause an apparent large age . Uranium has a much higher melting point .
It seems to me that your comment contains the following issues: the mineralogy of lead in zircon crystals; the Concordia technique, the credentials and competence of Dr Payne, Taking each of these points in turn … 1 . Mineralogy of zircon crystal formation Photo by R . V . Gentry . Zircon crystals are used for radioactive dating analysis .
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Uranium -lead dating , abbreviated U-Pb dating , is one of the oldest and most refined of the radiometric dating schemes . It can be used to date rocks that formed and crystallised from about 1 million years to over 4 .5 billion years ago with routine precisions in the 0 .1-1 percent range .
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Uranium Dating Problems