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Potassium—argon and argon—argon dating This is the most widely used system for radiometric dating of sedimentary strata, because it can be used to date the potassium-rich authigenic mineral glauconite and volcanic rocks lavas and tuffs that contain potassium in minerals such as some feldspars and micas.

Such a relationship results in an exponential decrease in the number of parent atoms remaining as a function of time, if "time" is expressed as the half life (the length of time required for 50% of an initial quantity of radioactive atoms to break down) .

This concept is illustrated in the diagram to the left.

In other words, radioactive decay is a Constant Rate Process.

The number of parent atoms that decay in a fixed period of time, or conversely the number of daughter atoms produced, depends on the number of parent atoms present at any point in time.


  1. How Do Scientists Determine the Age of Dinosaur Bones. The most widely known form of radiometric dating is. While the oldest known rocks on Earth are about.

  2. Because the elements used for dating need to be re-set by volcanism. Radioactive elements decay at a certain constant rate and this is the basis of radiometric dating.

  3. Radiometric dating is a method of. One example of this can be found in metamorphic rocks. One example of scientists not accepting radiometric.

  4. Potassium—argon and argon—argon dating This is the most widely used system for radiometric dating. dating of rocks. dating metamorphic.

  5. The radiometric dating of an. Metamorphic rock from igneous rock. Why is it almost impossible to date sedimentary rocks using radiometric dating.

  6. Radiometric dating. Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks.

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