XMapTools: A MATLAB©-based program for electron microprobe X-ray image processing and geothermobarometry

Lanari, Pierre and Vidal, Olivier and De Andrade, Vincent and Dubacq, Benoît and Lewin, Eric and Grosch, Eugene G. and Schwartz, Stephane (2014) XMapTools: A MATLAB©-based program for electron microprobe X-ray image processing and geothermobarometry. Computers & Geosciences, 62. pp. 227-240. ISSN 0098-3004 DOI 10.1016/j.cageo.2013.08.010

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Abstract

XMapTools is a MATLAB©-based graphical user interface program for electron microprobe X-ray image processing, which can be used to estimate the pressure–temperature conditions of crystallization of minerals in metamorphic rocks. This program (available online at http://www.xmaptools.com) provides a method to standardize raw electron microprobe data and includes functions to calculate the oxide weight percent compositions for various minerals. A set of external functions is provided to calculate structural formulae from the standardized analyses as well as to estimate pressure–temperature conditions of crystallization, using empirical and semi-empirical thermobarometers from the literature. Two graphical user interface modules, Chem2D and Triplot3D, are used to plot mineral compositions into binary and ternary diagrams. As an example, the software is used to study a high-pressure Himalayan eclogite sample from the Stak massif in Pakistan. The high-pressure paragenesis consisting of omphacite and garnet has been retrogressed to a symplectitic assemblage of amphibole, plagioclase and clinopyroxene. Mineral compositions corresponding to ~165,000 analyses yield estimates for the eclogitic pressure–temperature retrograde path from 25 kbar to 9 kbar. Corresponding pressure–temperature maps were plotted and used to interpret the link between the equilibrium conditions of crystallization and the symplectitic microstructures. This example illustrates the usefulness of XMapTools for studying variations of the chemical composition of minerals and for retrieving information on metamorphic conditions on a microscale, towards computation of continuous pressure–temperature-and relative time path in zoned metamorphic minerals not affected by post-crystallization diffusion.

Item Type: Article
Uncontrolled Keywords: 2013AREP; IA66;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
99 - Other
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Computers & Geosciences
Volume: 62
Page Range: pp. 227-240
Identification Number: 10.1016/j.cageo.2013.08.010
Depositing User: Sarah Humbert
Date Deposited: 24 Nov 2013 01:03
Last Modified: 16 Dec 2013 12:50
URI: http://eprints.esc.cam.ac.uk/id/eprint/2931

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