: This point often corresponds to the age of a later metamorphic event or disturbance that caused the lead loss. Interpretation Guidelines
: Grains that do not plot exactly on the Concordia curve are called "discordant". The degree of discordance can vary based on the intensity of the heating or fluid access that caused the disturbance. Discordia atomica
A "proper guide" to interpreting a Discordia line involves understanding its two key intersections with the (the mathematically determined line where the age equals the Key Intercepts : This point often corresponds to the age