Comparison of Quantitative Synchrotron MicroXANES (SmX) Fe^III/(Fe^II + Fe^III) Results for Amphibole and Silicate Glass with Independent Measurements

Details Comparison of Quantitative Synchrotron MicroXANES (SmX) Fe^III/(Fe^II + Fe^III) Results for Amphibole and Silicate Glass with Independent Measurements Comparison of Quantitative Synchrotron MicroXANES (SmX) Fe^III/(Fe^II + Fe^III) Results for Amphibole and Silicate Glass with Independent Measurements

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..299d&link_type=abstract

Lunar and Planetary Science, volume 27, page 299

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Amphibole, Glass, Mossbauer, Oxygen Fugacity, Synchrotron Microxanes

Scientific paper

In situ measurements of the oxidation states of elements such as Fe, Cr, V, Mn, Ti, Ce, Eu, Re, U can be made using synchrotron microXANES (SmX) techniques. Iron oxidation state measurements are of fundamental importance in most terrestrial systems and are useful in meteoritic and planetary materials. Oxidation state measurements of other transition metals have great implications for extraterrestrial samples that equilibrated at oxygen fugacities lower than typical terrestrial systems. The development of microbeam techniques using synchrotron x-ray sources, permits oxidation state measurements in microvolumes of sample comparable to the compositional microprobe analysis volumes. Comparison of Fe oxidation state ratios by SmX with independent data for amphibole samples and other minerals shows a good correlation between the microanalytical and bulk techniques. The spatial resolution of SmX permits zoning of oxidation states to be documented and also allows inclusions in minerals to be avoided. Analyses of Fe oxidation states can be made quantitatively in microvolumes comparable with those analyzed for composition by other microanalytical techniques. The consistence of the SmX results and conventional techniques implies that the simple calibration scheme used for SmX can be used for quantitative analyses of a broad range of terrestrial and extraterrestrial materials.

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