Redox ratios with relevant resolution: Solving an old problem by using the synchrotron microXANES probe

Abstract

Research Article| February 01, 1998 Redox ratios with relevant resolution: Solving an old problem by using the synchrotron microXANES probe Jeremy S. Delaney; Jeremy S. Delaney 1Department of Geological Sciences, Rutgers University, New Brunswick, New Jersey 08903 Search for other works by this author on: GSW Google Scholar M. Darby Dyar; M. Darby Dyar 2Department of Geology, West Chester University, West Chester, Pennsylvania 19383 Search for other works by this author on: GSW Google Scholar Steven R. Sutton; Steven R. Sutton 3Department of Geophysical Sciences and Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637 Search for other works by this author on: GSW Google Scholar Sasa Bajt Sasa Bajt 4Lawrence Livermore National Laboratory, Livermore, California 94550 Search for other works by this author on: GSW Google Scholar Author and Article Information Jeremy S. Delaney 1Department of Geological Sciences, Rutgers University, New Brunswick, New Jersey 08903 M. Darby Dyar 2Department of Geology, West Chester University, West Chester, Pennsylvania 19383 Steven R. Sutton 3Department of Geophysical Sciences and Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637 Sasa Bajt 4Lawrence Livermore National Laboratory, Livermore, California 94550 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1998) 26 (2): 139–142. https://doi.org/10.1130/0091-7613(1998)026<0139:RRWRRS>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jeremy S. Delaney, M. Darby Dyar, Steven R. Sutton, Sasa Bajt; Redox ratios with relevant resolution: Solving an old problem by using the synchrotron microXANES probe. Geology 1998;; 26 (2): 139–142. doi: https://doi.org/10.1130/0091-7613(1998)026<0139:RRWRRS>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract In situ measurements of the oxidation state of iron in common minerals have been made by using the synchrotron microXANES (SmX) technique. The results compare very well with wet-chemical and Mössbauer spectroscopic analyses of the same samples. Areas of 10 × 20 µm have been measured successfully, and the results demonstrate that both zoning of Fe3+ and the effect of oxide inclusions on bulk analyses can be quantified. Such sample heterogeneity cannot be detected by conventional bulk analytical techniques. The ability to measure Fe3+/ΣFe with spatial resolution comparable to that of the electron probe further enhances the importance of microbeam techniques in the earth and planetary sciences. Direct measurements of elemental oxidation states that can constrain oxidation-reduction processes are now possible with close to the spatial resolution of traditional compositional analyses derived from electron, or ion, beam and optical microscopic techniques. New, more intense, synchrotron sources such as the Advanced Photon Source at Argonne National Laboratory, are becoming available for analyses of 1–10 µm areas. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.