Discordia Atomica Direct

: This point often corresponds to the age of a later metamorphic event or disturbance that caused the lead loss. Interpretation Guidelines

In the context of geochronology and U-Pb (Uranium-Lead) radioisotope dating, refers to a straight line on a Concordia diagram that represents a suite of minerals that have lost some of their daughter isotopes (lead) or parent isotopes (uranium) due to a geological event. Discordia atomica

: For accurate results, "common lead" (lead not produced by radioactive decay inside the mineral) must be correctly subtracted. High-precision tools like SHRIMP (Sensitive High-Resolution Ion Microprobe) are often used to refine these 3D planar regressions . : This point often corresponds to the age