A further three-dimensional U-Pb method for solving the two-stage episodic model

Abstract

As a continuum of the preceding studies on the three-dimensional U-Pb method (Zheng, 1989), a further U-Pb discordia plane model is developed by taking the measured isotope ratios ²³⁵U/²⁰⁷Pb, ²⁰⁶Pb/²⁰⁷Pb and ²⁰⁴Pb/²⁰⁷Pb for X, Y and Z axis respectively. Its geometry and applicability are elucidated in order to show the advantage of the three-dimensional U-Pb isotopic data presentation.