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Carbon dating million years

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Because the different radioisotopes are dating the same geologic event, to have produced different "dates" has to mean that the parent radioisotopes have decayed at different rates over the same time period.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.Furthermore, the seven samples from the small amphibolite unit near Clear Creek, which should all be the same age because they belong to the same metamorphosed basalt lava flow, yielded K-Ar model ages ranging from 1060.4±28 Ma to 2574.2±73 Ma.This includes two samples only 0.84 meters apart that yielded K-Ar model ages of 1205.3±.2±73 Ma.Both laboratories use standard, best-practice procedures on state-of-the-art equipment.The model K-Ar ages for each of the samples ranged from 405.1±10 Ma to 2574.2±73 Ma.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.The computer program Isoplot was used to plot isochrons and calculate isochron ages from the other radioisotope analyses.The best isochron plots, where all the variation from the line of best fit to the data incorporates all the analytical errors, yielded an Rb-Sr isochron age of 1240±84 Ma, an Sm-Nd isochron age of 1655±40 Ma, and a Pb-Pb isochron age of 1883±53 Ma.

875 comments

  1. Radiocarbon dating is a popular dating method the general public is fairly familiar with. Though they may know it as carbon dating or carbon 14 dating.

  2. Radio Carbon dating suggests that the samples go back to 2,160+30 years and 2,200+30 years,” stated the Ministry. Archaeologists found deposits up to.

  3. Latest environmental news, features and updates. Pictures, video and more.

  4. Carbon dioxide CO2 is a gas essential for life—animals exhale it, plants sequester it. It exists in Earth's atmosphere in comparably small concentrations, but is.

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