| 单词 | potassium-argon dating |
| 释义 | potassium-argon dating in British Englishnoun 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 datingpotassium-argon dating in American English (poʊˌtæsiəmˈɑrˌgɑn; pəˌtæsiəmˈɑrˌgɑn) an indirect method of dating fossils, esp. those in very ancient volcanic rock, by using potassic minerals in the same strata as a reference: a natural radioactive isotope of potassium, K-40, decays steadily into argon, which accumulates in the minerals and is measured to determine age |
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