ISOPLOT; a plotting and regression program for radiogenic-isotope data; version 2.53

Abstract

Construct U-Pb concordia plots (conventional, Tera-Wasserburg, or Tatsumoto-style) and calculate concordia-intercept ages and errors (p.18); ^ Construct projections of 3-dimensional (X-Y-Z) plots, determine best-fit planes to X-Y-Z data, and calculate concordia intercepts and uncertainties for 3-dimensional concordia data (p.21, 24); * Construct single-stage growth-curves for plots of common-Pb data (p.21, 24); * Construct MOTh/238U -^U^U evolution curves for U-series data (p.26); ^ Calculate and construct plots for weighted averages of a single variable (p.28); ^ Show histograms of a data-set, with calculated mean, median, and biweight-mean values (p.28); * Calculate radiogenic 207Pb/206Pb ages, common-Pb model ages, Nd, Sr, Os, and Hf model ages, U-series ages, and ages from the secular global-marine Sr-isotope trend (pp.30-31); * Do curvilinear (polynomial) regressions for X-Y data (p.17);* Fit a smooth curve (either precisely or in a least-squares sense) to data of arbitrary complexity using spline curves (p.17);To obtain a disk or disks containing Isoplot, write directly to K.R. Ludwig (U.S. Geological Survey,