Cesium dating

Nevertheless, some important differences were also observed.For two of the three lakes, there was a significant difference in average sediment accumulation rate during the past 33 yrs as calculated from Pb in the recent cores.

The potassium-argon age of some meteorites is as old as 4,500,000,000 years, and volcanic rocks as young as 20,000 years old have been measured by this method.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.The calcium-potassium age method is seldom used, however, because of the great abundance of nonradiogenic calcium in minerals or rocks, which masks the presence of radiogenic calcium.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.

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