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    Isochron dating

    However, it is easy to imagine scenarios that could cause isochrons to yield false daates, and geologists recognize that isochrons can yield bad dates.

    The idea of isochrons is this: Suppose X is a parent element that decays in to Y and Z is another isotope of Y not produced by radioactive decay. Since Y and Z are isotopes, we would assume they have similar chemical properties.

    Suppose A is very old (or appears very old) and B is very young. Their perceived radiometric age would then be between that of A and B.

    isochron dating-19isochron dating-41

    For purposes of illustration, consider the rubidium-strontium decay system.

    It follows that the ratios x/z and y/z have a linear relationship whose slope yields the age of the sample.

    If these ratios are observed to obey such a linear relationship in a series of rocks, then an age can be computed from them.

    When a single body of liquid rock crystallizes, parent and daughter elements may separate so that, once solid, the isotopic data would define a series of points, such as those shown as open circles designated R.

    With time each would then develop additional daughter abundances in proportion to the amount of parent present.

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