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Posted by / 20-Apr-2020 00:28

Cesium dating

Developed in the 1950s, it was important in developing the theory of plate tectonics and in calibrating the geologic time scale.

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.

The selected size fraction is cleaned in ultrasound and acid baths, then gently oven-dried.

The target mineral is separated using heavy liquids, then hand-picked under the microscope for the purest possible sample.

That is, a fresh mineral grain has its K-Ar "clock" set at zero.

The rock sample to be dated must be chosen very carefully.

On the other hand, the abundance of argon in the Earth is relatively small because of its escape to the atmosphere during processes associated with volcanism.Pb has been used for more than two decades to provide the geochronology of annually deposited sediments and to construct pollution histories.Evidence from some lakes suggests that this radionuclide may be adequately mobile to compromise dating reliability.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.

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