The isotopes of potassium in the rock/mineral have not fractionated, except by 40K decay. The decay constants of 40K are accurately known. The quantities of 40Ar and potassium in the rock/mineral are accurately determined.

What is potassium-argon dating Good For?

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.

What type of dating is potassium-argon dating?

radiometric dating Potassium-Argon (K-Ar) dating is the most widely applied technique of radiometric dating. Potassium is a component in many common minerals and can be used to determine the ages of igneous and metamorphic rocks.

Why cant carbon 14 dating BE USED FOR AGES 50 000 years and older?

Carbon dating also cannot be used on artifacts over about 50,000 years old. These artifacts have gone through many carbon-14 half-lives and the amount of carbon-14 remaining in them is miniscule and very difficult to detect.

How can I add potassium to my soil naturally?

This can be accomplished by using basic items such as fruit, ashes and coffee.Add fruit to compost. Cut potassium-rich banana peels into small pieces, then mix into your compost pile. Burn wood. Gather the potassium-rich ashes once the fire is out. Collect used coffee grounds.