Potassium argon method of dating igneous rocks www qwedating ru
To illustrate these efforts, dating results from a rhyodacite of Mauna Kuwale, Oahu, Hawaii, are reported.
Determinations on several minerals and the whole rock of this ridge give a concordant age of 2.3 ± 0.3 million years, excluding some few results on minerals which show old age anomalies.
However it has been found that dates obtained on whole rocks and on included minerals frequently show gross discordances.
In order to establish this dating method in this application an attempt has been made to trace the sources of the anomalies.
All rocks and minerals contain tiny amounts of these radioactive elements.Radioactive elements are unstable; they breakdown spontaneously into more stable atoms over time, a process known as radioactive decay.Radioactive decay occurs at a constant rate, specific to each radioactive isotope.Radiometric dating has been used to determine the ages of the Earth, Moon, meteorites, ages of fossils, including early man, timing of glaciations, ages of mineral deposits, recurrence rates of earthquakes and volcanic eruptions, the history of reversals of Earth's magnetic field, and many of other geological events and processes.K has a half-life of 1.248 billion years, which makes it eminently suitable for dating rocks.