Potassium-argon dating is accurate from 43 billion years (the age of the earth) to about 100,000 years before the present at 100,000 years, only 00053% of the potassium-40 in a rock would have decayed to argon-40, pushing the limits of present detection devices.
(a) the varying mineral composition of the myriads of types of rocks negates the accuracy of the standard potassium-argon dating method (b) the potassium-argon method should not be used to calculate the ages of rocks (c) as all new radiometric dating methods are calibrated using dates from existing methods, any based directly. Potassium-argon dating, method of determining the time of origin of rocks by measuring the ratio of radioactive argon to radioactive potassium in the rock this dating method is based upon the decay of radioactive potassium-40 to radioactive argon-40 in minerals and rocks potassium-40 also decays to calcium-40.
The radioactive decay scheme involving the breakdown of potassium of mass 40 (40 k) to argon gas of mass 40 (40 ar) formed the basis of the first widely used isotopic dating method since radiogenic argon-40 was first detected in 1938 by the american geophysicist lyman t aldrich and ao nier, the method has evolved into one of the. Potassium-argon dating i not my area of expertise but i am extremely interested in it don't take what is on this page as a scientific endeavor. Potassium-argon dating has the advantage that the argon is an inert gas that does not react chemically and would not be expected to be included in the solidification of a rock, so any found inside a rock is very likely the result of radioactive decay of potassium.
Potassium-argon rock dating potassium-argon dating is a technique used to determine the age of rocks because argon is a noble gas, it does not form compounds and remains a gas, trapped in the solid rock. Clocks in the rocks potassium-argon method potassium-argon dating has the advantage that the argon is an inert gas that does not react chemically and would. Potassium-argon dating has the additional advantage that the argon does not react chemically, so any ar found inside a rock is almost.
Argon geochronology facilities in a closed system can be expressed by the equation: the k/ar dating technique general assumptions for the potassium-argon dating.
Potassium-argon dating, method of determining the time of origin of rocks by measuring the ratio of radioactive argon to radioactive potassium in the rock this dating method is based upon the decay of radioactive potassium-40 to radioactive argon-40 in minerals and rocks potassium-40 also decays. A timber found in a home built 5730 years ago (one half life) would have half the 14 c: 12 c ratio that a person living today would potassium-argon dating. The potassium-argon (k-ar) isotopic dating method is especially useful for determining the age of lavas developed in the 1950s, it was important in developing the theory of plate tectonics and in calibrating the geologic time scale.