Potassium argon method of dating igneous rocks singapo love dating site 2016

Geologists have used this method to date rocks as much as 4 billion years old.

It is based on the fact that some of the radioactive isotope of Potassium, Potassium-40 (K-40) ,decays to the gas Argon as Argon-40 (Ar-40).

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.One out of every 10,000 Potassium atoms is radioactive Potassium-40 (K-40).These each have 19 protons and 21 neutrons in their nucleus.However, are all other rocks in the earth's crust also susceptible to "contamination" by excess emanating from the mantle?If so, then the K-Ar and Ar-Ar "dating" of crustal rocks would be similarly questionable.