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..to the extent of about 100 parts per million (ppm) in tektites—far below the value for terrestrial igneous or sedimentary rocks.Much information about tektite history is obtained by radioisotopic dating; the ages cited above for the tektite strewn-fields were found by potassium-argon dating.One new and fundamental result has come from radiometric age dating of the samples.When a rock cools from the molten to the solid state, its radioactive isotopes are immobilized in mineral crystal lattices and then decay in place.

other radioactive dating methods-78other radioactive dating methods-80

Another role of isotopic geochemistry that is of great importance in geology is radiometric age dating. Beginning with studies in the 1950s, a much better chronology and record of Pleistocene climatic events have evolved through analyses of deep-sea sediments, particularly from the oxygen isotope record of the shells of microorganisms that lived in the oceans.

The igneous activity that produced such intrusions...

...calculation was based on the assumption that the substance of the Earth is inert and thus incapable of producing new heat.

As a result of their longevity, they are still present in meteorites and on Earth, and they are commonly used for dating rocks and meteorites.

Radioactive elements in the Earth, the Moon, and in meteorites can provide useful information about the ages of these objects and about the dates of formation of the heavy elements themselves.

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