Argon dating potassium ppt
Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology.
It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar).
After its introductionto the scientific community in 1950, it quickly became the method most frequently used to determine the age of organic materials.
This 9,300 year old wooden wedge was found at the Kilgii Gwaay archaeological site.
Ar (argon), the atom typically remains trapped within the lattice because it is larger than the spaces between the other atoms in a mineral crystal.
But it can escape into the surrounding region when the right conditions are met, such as change in pressure and/or temperature.
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The geomagnetic polarity time scale was calibrated largely using K–Ar dating.
The amount of Argon sublimation that occurs is a function of the purity of the sample, the composition of the mother material, and a number of other factors.
These factors introduce error limits on the upper and lower bounds of dating, so that final determination of age is reliant on the environmental factors during formation, melting, and exposure to decreased pressure and/or open-air.
In a way this field, called geochronology, is some of the purest detective work earth scientists do.
There are two basic approaches: relative age dating, and absolute age dating.
Any scientific study of the past, including the geologic past, relies on the use of dating methods to determine the age of sites, landforms, sediments or geologic events.