Whole rock dating

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Radiometric Dating

Should a simple igneous body be subjected to an episode of heating or of deformation or of a combination of both, a well-documented special data pattern develops. With heat, daughter isotopes diffuse out of their host minerals but are incorporated into other minerals in the rock. When the rock again cools, the minerals close and again accumulate daughter products to record the time since the second event. Remarkably, the isotopes remain within the rock sample analyzed, and so a suite of whole rocks can still provide a valid primary age. This situation is easily visualized on an isochron diagram, where a series of rocks plots on a steep line showing the primary age, but the minerals in each rock plot on a series of parallel lines that indicate the time since the heating event.

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Ajoy K. Leonardo da Vinci, ca. Herein, I set out some simple guidelines to permit readers to assess the reliability of published ages. I illustrate the use of the techniques by looking at published age data for hotspot tracks in the Atlantic Ocean the Walvis Ridge , as well as newly published ages for the British Tertiary Igneous Province. In these experiments, a sample is heated in steps of increasing laboratory extraction temperature, until all the argon is released.

Petrology Tulane University Prof. Stephen A. Nelson Radiometric Dating Prior to the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state. Although we now recognize lots of problems with that calculation, the age of 25 my was accepted by most physicists, but considered too short by most geologists.

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