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GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,
VOL. 7,
Q11020,
10 PP., 2006
doi:10.1029/2006GC001381 [Citation]
Redox and speciation micromapping using dispersive X-ray absorption spectroscopy: Application to iron in chlorite mineral of a metamorphic rock thin section
Laboratoire de Géodynamique des Chaînes Alpines, Université Joseph Fourier, 1381 Rue de la Piscine, Grenoble, F-38041 France
European Synchrotron Radiation Facility, Grenoble, F-38043 France
Laboratoire de Géodynamique des Chaînes Alpines, Université Joseph Fourier, 1381 Rue de la Piscine, Grenoble, F-38041 France
Laboratoire de Géodynamique des Chaînes Alpines, Université Joseph Fourier, 1381 Rue de la Piscine, Grenoble, F-38041 France
Laboratoire de Géodynamique des Chaînes Alpines, Université Joseph Fourier, 1381 Rue de la Piscine, Grenoble, F-38041 France
European Synchrotron Radiation Facility, Grenoble, F-38043 France
European Synchrotron Radiation Facility, Grenoble, F-38043 France
The first dispersive μ-XANES mapping is presented here. The experiments have been conducted at the iron K-edge, on the “Dispersive-EXAFS” beamline of the European Synchrotron Radiation Facility (France). The mapping has been performed on a polished thin section of 30 μm of a natural metamorphic rock including different types of minerals. Because of the high X-ray absorption due to the thickness of the glass sample holder (∼1 mm), the data have been collected in the fluorescence mode using the so-called “Turbo-XAFS” design. The effective spot size was approximately 10 × 10 microns, and an area 390 × 180 microns in size was mapped. Improvements of the acquisition process allowed collection of each XANES spectrum in 1.5 s and with a step size of 5 microns so that 2808 spectra with full XANES information were collected. Then, automatic procedures for data reduction and mapping reconstruction were developed using Matlab®. The results are maps of iron content, oxidation state, and speciation, with a 5 μm spatial resolution after two-dimensional deconvolution. Subsequent analyses of the reconstructed images provide some quantitative calibrations.
Received 6 June 2006; accepted 18 September 2006; published 25 November 2006.
Citation: (2006), Redox and speciation micromapping using dispersive X-ray absorption spectroscopy: Application to iron in chlorite mineral of a metamorphic rock thin section, Geochem. Geophys. Geosyst., 7, Q11020, doi:10.1029/2006GC001381.
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