are maksim chmerkovskiy and karina smirnoff dating - Potassium argon dating fossils

Next, ​the mineral sample is heated to melting in a vacuum furnace, driving out all the gas.A precise amount of argon-38 is added to the gas as a "spike" to help calibrate the measurement, and the gas sample is collected onto activated charcoal cooled by liquid nitrogen.

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The method relies on satisfying some important assumptions: Given careful work in the field and in the lab, these assumptions can be met.

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

The learning curve has been long and is far from over today.

With each increment in quality, more subtle sources of error have been found and taken into account.

But micas, plagioclase, hornblende, clays and other minerals can yield good data, as can whole-rock analyses.

Young rocks have low levels of Ar, so as much as several kilograms may be needed.

Lava flows that lie above and below rock beds with ancient human fossils are a good—and true—example.

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