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Dating with radioisotope

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Based on radiometric dating, long-age geologists say that the basalt lavas erupted 1,745 million years ago4 and were metamorphosed some 1,700 million years ago.5 Many people, including many scientists, accept these dates as absolute truth.Deep inside the Inner Gorge of Grand Canyon, northern Arizona, are the crystalline basement rocks that probably date back even to the Creation Week itself.In Grand Canyon, the "date" of metamorphism of the basalt lavas to form these Brahma amphibolites has been determined as 1690-1710 Ma (million years ago), based on U-Pb dating of minerals in the overlying Vishnu Schist and underlying Rama Schist that formed during the metamorphism.Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.The latter are former sedimentary and volcanic layers that have been transformed (metamorphosed) by heat and pressure during intense geologic upheavals in the past.Among these volcanic layers are distinctive dark-coloured rocks called amphibolites3 (figure 3).Radioactive elements, such as rubidium-87 (but not strontium-86 or strontium-87), decay over time.By evaluating the concentrations of all of these isotopes in a rock sample, scientists can determine what its original make-up of strontium and rubidium were.

and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of the Earth itself, and can also be used to date a wide range of natural and man-made materials.

Among these metamorphosed volcanic strata are amphibolites, belonging to the Brahma Schist.

These were originally basalt lava flows several meters to tens of meters thick.

The number of protons in an atom determines which element it is, while the number of neutrons determines which isotope it is.

For example, strontium-86 has 38 protons and 48 neutrons, whereas strontium-87 has 38 protons and 49 neutrons.