But even the best geologic methods are imperfect. Precambrian Research A Computer program for processing Pb-U-Th isotope data. Uranium-lead dating uses four different isotopes to find the age of the rock. This document is subject to copyright. There are 5 main ways to separate U and Pb from zircon solution: After digestion first steps, the sample is evaporated, and the procedure is repeated.
The mineral fractions may be previously polished by air abrasion mill without pyrite powder.
The upper intercept of the concordia and the discordia line will reflect the original age of formation, while the lower intercept will reflect the age of the event that led to open system behavior and therefore the lead loss; although there has been some disagreement regarding the meaning of the lower intercept ages. Carnegie Inst Wash Yearb The disintegration products of uranium: May 29, Ryazantseva, pers. As each dating method was developed, tested, and improved, mainly sincea vast body of knowledge about the behaviour of different isotopic systems under different geologic conditions has evolved. The resin mixture consists of 0.