Statistical Toolbox for Radiometric Geochronology

Plots U-Pb data on Wetherill and Tera-Wasserburg concordia diagrams. Calculates concordia and discordia ages. Performs linear regression of measurements with correlated errors using 'York', 'Titterington' and 'Ludwig' approaches. Generates Kernel Density Estimates (KDEs) and Cumulative Age Distributions (CADs). Produces Multidimensional Scaling (MDS) configurations and Shepard plots of multi-sample detrital datasets using the Kolmogorov-Smirnov distance as a dissimilarity measure. Calculates 40Ar/39Ar ages, isochrons, and age spectra. Computes weighted means accounting for overdispersion. Calculates U-Th-He (single grain and central) ages, logratio plots and ternary diagrams. Processes fission track data using the external detector method and LA-ICP-MS, calculates central ages and plots fission track and other data on radial (a.k.a. 'Galbraith') plots. Constructs total Pb-U, Pb-Pb, K-Ca, Re-Os, Sm-Nd, Lu-Hf, Rb-Sr and 230Th-U isochrons as well as 230Th-U evolution plots.

IsoplotR is a free and open-source substitute for Kenneth Ludwig's popular Isoplot add-in to Microsoft Excel. This Github repository contains the code for IsoplotR's core commands. A graphical user interface is provided in a separate repository at


You must have R installed on your system (see Additionally, to install IsoplotR from Github, you also need the devtools package. This can be installed by typing the following code at the R command line prompt:



The most recent stable version of IsoplotR is available from CRAN at and can be installed on your system as follows:


Alternatively, to install the current development version of IsoplotR from Github, type:


Further information


Vermeesch, P., 2018, IsoplotR: a free and open toolbox for geochronology. Geoscience Frontiers, v.9, p.1479-1493, doi: 10.1016/j.gsf.2018.04.001.


Pieter Vermeesch


This project is licensed under the GPL-3 License


Reference manual

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2.3 by Pieter Vermeesch, 2 months ago

Browse source code at

Authors: Pieter Vermeesch [aut, cre]

Documentation:   PDF Manual  

GPL-3 license

Imports MASS, grDevices, graphics, stats, utils

Imported by provenance.

See at CRAN