Sanidin k ar dating indian dating customs

93)Cambridge, Massachusetts, USA, performed the K-Ar dating for Austin et al. However, when they did, their website clearly stated in a footnote that their equipment could not accurately date rocks that are younger than about 2 million years old ("We cannot analyze samples expected to be younger than 2 M.

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The mineral sanidine, the high-temperature form of potassium feldspar, is the most desirable.Any alteration or fracturing means that the potassium or the argon or both have been disturbed.The site also must be geologically meaningful, clearly related to fossil-bearing rocks or other features that need a good date to join the big story.But micas, plagioclase, hornblende, clays, and other minerals can yield good data, as can whole-rock analyses.Young rocks have low levels of The rock samples are crushed, in clean equipment, to a size that preserves whole grains of the mineral to be dated, then sieved to help concentrate these grains of the target mineral.

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