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This belief in long ages for the earth and the existence of life is derived largely from radiometric dating.
In addition to providing a minima for acceptable TL ages, U/Th dates are useful for determining the chronology of pedogenesis/diagenesis.Above are muds and fine sandy muds that extend uninterrupted to the present surface except in the downstream fan where they are bisected by a thin unit of medium sand that TL dates at 40,000–50,000 yr B. A system of sandy distributary channels over the fan surface represents an early Holocene fluvial phase probably more active than at present.Although many U-Th-Pb analytical techniques and applications are well established, emerging technologies are revolutionizing the way geochronologic information can be acquired and applied.55-57, (1987), gives us an idea of the tremendous complexity of the processes that occur when magma solidifies.The general idea is that many different minerals are formed, which differ from one another in composition, even though they come from the same magma.Thermoluminescence (TL) age determinations of alluvial sediments in the tropics are evaluated by comparison with U/Th age determinations of pedogenic accumulations in the alluvium of the lower Gilbert River, a large fan delta in the wet-dry tropics of northern Queensland, Australia.
This study extends U/Th dating by applying it not only to calcretes, but also to Fe/Mn oxyhydroxide/oxide accumulations.
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.
The following quote from The Earth: An Introduction to Physical Geology by Tarbuck & Lutgens, pp.
However, geologists have found that various eruptive stages of the same volcano often extrude lavas exhibiting somewhat different mineral compositions, particularly if an extensive period of time separated the eruptions.
Evidence of this type led them to look into the possibility that a single magma might produce rocks of varying mineral content. Bowen discovered that as magma cools in the laboratory, certain minerals crystallize first.
Radiometric dating or radioactive dating is a technique used to date materials such as rocks or. Laboratory experiments have been conducted on the solubility of argon in synthetic.