Question: Why K Ar Cannot date younger rock?

Limitations of K-Ar dating Still, as a general rule, the proportional error in K-Ar dating will be greatest in the youngest rocks. Because argon is inert, it cannot be chemically incorporated in the minerals when they are formed, but it can be physically trapped in the rocks either during or after formation.

Which of the following is suitable for 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 to calcium-40.

Which type of rock can be dated only when you use potassium-argon radioactive decay?

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 .ParentRubidium-87DaughterStrontium-87Half Life(years)47,000millionDating Range(years)10 - 4,600 million3 more columns

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