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radiometric dating
(redirected from Rock dating)

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radiometric dating
n
(Social Science / Archaeology) any method of dating material based on the decay of its constituent radioactive atoms, such as potassium-argon dating or rubidium-strontium dating Also called radioactive dating
radiometric dating  (rd--mtrk)
A method for determining the age of an object based on the concentration of a particular radioactive isotope contained within it. For inorganic materials, such as rocks containing the radioactive isotope rubidium, the amount of the isotope in the object is compared to the amount of the isotope's decay products (in this case strontium). The object's approximate age can then be figured out using the known rate of decay of the isotope. For organic materials, the comparison is between the current ratio of a radioactive isotope to a stable isotope of the same element and the known ratio of the two isotopes in living organisms. Radiocarbon dating is one such type of radiometric dating.
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Many of the mines in Ontario are associated with these large greenstone belts," says Pace, with some rock dating back 2.
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The ancient city of Petra, a marvel hewn out of living rose red rock dating back thousands of years that serves as one of the symbols of Jordan, drew just over 359,000 foreign visitors last year, 12.
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