What they found was that the muscovite absorbed large quantities of Argon. Sometimes, however, numerous discordant dates from the same rock will plot along a line representing a chord on the Concordia diagram. The answer is about 6 billion years. Such trapped Ar is not problematical when the age of the rock is in hundreds of millions of years. The potassium is quantified by flame photometry or atomic absorption spectroscopy. Skinner, only 10 could be used. June
The initial ratio has particular importance for studying the chemical evolution of the Earth's mantle and crust, as we discussed in the section on igneous rocks.
Thus radioactive isotopes have potential as fuel for such processes as mountain building, convection in the mantle to drive plate tectonics, and convection in the core to produce the Earth's magnetic Field. Isotopes of potassium. The answer is about 6 billion years. Principles of Radiometric Dating. Thus, while a rock is molten the Ar 40 formed by the decay of K 40 escapes from the liquid. Most scientists do not believe that the short chronology of the Bible has any validity at all and most would consider it counterproductive to pursue such a course of investigation.