Dating in ar
Direct dating of ductile shear zones and calculation of uplift/exhumation rates can be done using various radiometric dating techniques.
But radiometric dating of shallow crustal faulting, which occurs in the crust's brittle regime, has remained difficult because the low temperatures typical of shallow crusted faults prevent the complete syntectonic mineral recrystallization that occurs in deeper faults.
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This result requires the western North America stress regime to have changed from contraction to extension in only a few million years during the Eocene.
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I don't doubt that K-Ar dating of rocks is a sound method, but in discussions with skeptics it would be good to know just how reliable exactly?
For example, has K-Ar been cross-checked with other rock dating methods, such as radiocarbon, sediment varves, etc. The reliability is dependent on the quality, (for instance is the mineral reworked or porous and thus prone to contamination), and size of the sample, (small samples result in poorer measurement).
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Personals are for people local to Jonesboro, AR and are for ages 18 of either sex. The Ar data outline some advantages, such as the plateaus obtained by incremental step heating of the various size fractions, even if not translatable straight as ages of the illite populations; they allow identification of two generations of authigenic illite that formed at about 200 and 175 Ma, and one detrital generation.