Potassium argon and argon argon dating

21-Aug-2017 01:07

potassium argon and argon argon dating-59

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Lava flows that lie above and below rock beds with ancient human fossils are a good—and true—example.The mineral sanidine, the high-temperature form of potassium feldspar, is the most desirable.Results in the potassium-argon dating program at Berkeley are reported.Geologically well-classified authigenic sediments ranging from Miocene (12 m.y.) to Givetian (285 m.y.) have been analyzed utilizing equipment designed to date materials of low radiogenic argon content.

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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.What simplifies things is that potassium is a reactive metal and argon is an inert gas: Potassium is always tightly locked up in minerals whereas argon is not part of any minerals. So assuming that no air gets into a mineral grain when it first forms, it has zero argon content.

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