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And the K-Ar model "ages" are so widely divergent from one another (ranging from 405.1±10 Ma to 2574.2±73 Ma), even from very closely spaced samples from the same outcrop of the same original lava flow, as to be useless for "dating" any event.These discordant results could easily be dismissed as an isolated aberration, perhaps due to the uncertain effects of metamorphism and any subsequent alteration, especially during erosion and weathering.Yet the discordance patterns are consistent with past accelerated radioisotope decay, which would also render these "clocks" useless.

Results obtained usually signify the "date" of the metamorphism, but they may also yield the "age" of the original volcanic (or sedimentary) rock.

The "age" or "date" is calculated from the amount of the daughter isotope produced by radioactive decay of the parent isotope.

In Grand Canyon, the "date" of metamorphism of the basalt lavas to form these Brahma amphibolites has been determined as 1690-1710 Ma (million years ago), based on U-Pb dating of minerals in the overlying Vishnu Schist and underlying Rama Schist that formed during the metamorphism.

Most people believe that when the different radioisotope dating methods are used on the same rock unit they all yield the same age.

However, the radioisotope dating of these Grand Canyon rocks clearly demonstrates that the disagreement, or isochron discordance, is pronounced.

These were originally basalt lava flows several meters to tens of meters thick.

A brief introduction to isochron dating methodology. The technique and related ones is widely used in isotope geology. and had one Rb-Sr isochron age.… continue reading »

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The rubidium-strontium dating method is a radiometric dating technique used by scientists to determine the age of rocks and minerals from the quantities they contain of specific isotopes of rubidium 87 Rb and strontium 87 Sr, 86 Sr.… continue reading »

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The rubidium strontium dating 1. 1. all samples have remained closed systems with respect to Rb and Sr. The slope of the isochron.… continue reading »

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Alkali Metal Dating, Rb-Sr Dating Model Radioactive Dating, Part 4. the assumptions the Rb-Sr isochron dating method is based on do not seem to be reasonable.… continue reading »

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