potassium-argon dating

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Related to K-Ar dating: Potassium argon dating

potassium-argon dating

n
(General Physics) a technique for determining the age of minerals based on the occurrence in natural potassium of a small fixed amount of radioisotope 40K that decays to the stable argon isotope 40Ar with a half-life of 1.28 × 109 years. Measurement of the ratio of these isotopes thus gives the age of the mineral. Compare radiocarbon dating, rubidium-strontium dating

potas′sium-ar′gon dat`ing


n.
a method for estimating the age of a mineral or rock, based on measurement of the rate of decay of radioactive potassium into argon.
[1965–70]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.potassium-argon dating - geological dating that relies on the proportions of radioactive potassium in a rock sample and its decay product, argon
dating, geological dating - use of chemical analysis to estimate the age of geological specimens
References in periodicals archive ?
Armstrong, K-Ar dating of quaternary and neogene volcanic rocks of the Snake River Plains, Idaho.
Detailed work in parts of the Newark Supergroup indicates eruption of the full sequence in less than 580 ka based on detailed paleontological, paleomagnetic, and K-Ar dating (Olsen and Fedosh 1988; Olsen 1997).