Potassium argon dating advantages and disadvantages
The conventional K-Ar dating method depends on the assumption that the rocks contained no argon at the time of formation and that all the subsequent radiogenic argon (i.e., Ar that has accumulated.
The minerals that are best suited for dating include biotite, muscovite, and plutonic/high grade metamorphic hornblende, and volcanic feldspar; whole rock samples from volcanic flows and shallow instrusives can also be dated if they are unaltered (Faure, 1986).
The amount of cosmic rays reaching the Earth varies with the sun's activity, and with the Earth's passage through magnetic clouds as the solar system travels around the Milky Way galaxy.Source of text: This review was assembled by Dan Snyder and Carol Kendall, primarily drawing upon Faure (1986) and Fabryka-Martin (1988).Please contact Carol Kendall ([email protected]) for questions and comments regarding this page. For a discussion of K-Ar dating see Dalrymple and Lanphere (1969) and Faure (1986).Under some circumstances the requirements for successful K-Ar dating may be violated.