potassium-argon dating


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potassium-argon dating

[pə′tas·ē·əm ′är‚gän ′dād·iŋ]
(geology)
Dating of archeological, geological, or organic specimens by measuring the amount of argon accumulated in the matrix rock through decay of radioactive potassium.
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Radiocarbon dates objects up to about 40,000 years old, and potassium-argon dating cannot be used for objects less than about 200,000 years old.
As discussed above and in the earlier paper on potassium-argon dating, hydrothermal effects can result in a resetting of the radioactive clocks.

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