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    Methods of dating meteorites

    Scientific knowledge of Earth’s geologic history has advanced significantly since the development of radiometric dating, a method of age determination based on the principle that radioactive atoms in geologic materials decay at constant, known rates to daughter atoms.Radiometric dating has provided not only a means of numerically quantifying geologic time but also a tool for determining the...The igneous activity that produced such intrusions...

    He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.Two other characteristics of lead isotope measurements make it superior to other methods.First, measuring the isotope ratio of a single element can be done much more precisely than measuring isotope ratios of two differing elements.Lead isotopes are commonly used in dating rocks and provide some of the best evidence for the Earth's age.In order to be used as a natural clock to calculate the age of the earth, the processes generating lead isotopes must meet the four conditions of a natural clock: an irreversible process, a uniform rate, an initial condition, and a final condition.

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