concordant age
concordant age If the minerals in a rock have remained geochemically undisturbed since their formation, it is possible for the ages obtained by different radiometric methods (for example, the decay of 40K to 40Ar, 87Rb to 87Sr, 238U to 206Pb, 235U to 207Pb, and 232Th to 208Pb) to agree within the levels imposed by the accuracy of their known half-lives (see DECAY CONSTANT). If all the methods employed give a reasonable level of agreement, then the age is concordant. See RADIOMETRIC DATING.
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Absolute Age , absolute age(true age) The age of a geologic phenomenon measured in present Earth years, rather than its age relative to other geologic phenomena (co… Potassium-argon Dating , potassium–argon dating A dating technique for certain rocks that depends on the decay of the radioisotope potassium–40 to argon–40, a process with a… Thorium-lead Dating , thorium-lead dating A radiometric dating method based on the radioactive decay of 232Th, to yield 208Pb + 6He4, with a half-life (see DECAY CONSTANT)… Carbon Dating , Carbon dating is a technique used to determine the approximate age of once-living materials. It is based on the decay rate of the radioactive carbon… Rubidium-strontium Dating , rubidium—strontium dating A radiometric dating method based on the radioactive decay of 87Rb to 87Sr. Rubidium has two isotopes (85Rb 72.15%, 87Rb 27… Radioactive Dating , Radioactive dating is a method of determining the approximate age of an old object by measuring the amount of a known radioactive element it contains…
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concordant age