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description: Dating > Age dating metamorphic rocks
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# Age dating metamorphic rocks

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More slowly decaying isotopes are useful for longer periods of time, but less accurate in absolute years. In the process the paper refutes a number of misconceptions prevalent among Christians today. All ordinary is made up of combinations of , each with its own , indicating the number of in the. Advocates of these methods assume that melting or liquid magma at the beginning resets the age clock to zero that is, there are no daughter isotopes in the rock at the time of cooling or solidification.\
&#x20;![age dating metamorphic rocks](http://slideplayer.com/7380262/24/images/19/Absolute-Age+Dating+of+Rocks.jpg)\


Measurement of the concentrations of different isotopes is carried out with a mass spectrometer. Chemically, zircon usually contains high amounts of U and low amounts of Pb, so that large amounts of radiogenic Pb are produced. Since probably formed at the same time, this supports the current idea of the Earth's age.\
&#x20;![age dating metamorphic rocks](http://image.slideserve.com/1119215/slide40-n.jpg)\


**société jurassienne d'émulation** - This technique is less used now.\
&#x20;![age dating metamorphic rocks](http://slideplayer.com/1588705/5/images/1/21.3+%E2%80%93+Absolute-Age+Dating+Objectives.jpg)\
