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Such processes can cause the daughter product to be enriched relative to the parent, which would make the rock look older, or cause the parent to be enriched relative to the daughter, which would make the rock look younger.
This calls the whole radiometric dating scheme into serious question.
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.
A number of processes could cause the parent substance to be depleted at the top of the magma chamber, or the daughter product to be enriched, both of which would cause the lava erupting earlier to appear very old according to radiometric dating, and lava erupting later to appear younger.And you can read Gary's explanations of Helium in Zircons for Talk Rational's discussion forum about Evolution and Origins in 2010.• In 2008, a young-earth RATE response to by Russell Humphreys (Helium evidence for a young world continues to confound critics) plus two counter-responses by Gary Loechelt, Helium Diffusion in Zircon: A Response to Questions by the Rate Team and, in more detail, A Response to the RATE Team — Regarding Helium Diffusion in Zircon.by Kirk Bertsche, is an expansion of his reply in PSCF, which you can read above in Polonium Halos in Granites • Polonium Halos and Myrmekite in Pegmatite & Granite by Lorence Collins, who also has a links-page (halos are examined in 3, 4, 5, 6, 9, 10, 14) Excessive Heat — a Catastrophic Problem for a Catastrophic Flood What is the problem?RATE acknowledges the occurrence of This decay occurs throughout the geological formations that, according to flood geology, were produced by the flood.
" — and these sources of heat by themselves (even if only one or a few of them occurred, even without rapid radioactive decay) would boil away all of the ocean water, and then it would take millions of years for earth to cool. In Assessing the RATE Project, Randy Isaac describes the current situation: "The authors admit that a young-earth position cannot be reconciled with the scientific data without assuming that exotic solutions will be discovered in the future.