Fe3+/H+ and D/H in kaersutites—Misleading indicators of mantle source fugacities

Research Article| June 01, 1992 Fe3+/H+ and D/H in kaersutites—Misleading indicators of mantle source fugacities M. Darby Dyar; M. Darby Dyar 1Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403 Search for other works by this author on: GSW Google Scholar Anne V. McGuire; Anne V. McGuire 2Department of Geosciences, University of Houston, Houston, Texas 77204 Search for other works by this author on: GSW Google Scholar Stephen J. Mackwell Stephen J. Mackwell 3Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802 Search for other works by this author on: GSW Google Scholar Geology (1992) 20 (6): 565–568. https://doi.org/10.1130/0091-7613(1992)020<0565:FHADHI>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation M. Darby Dyar, Anne V. McGuire, Stephen J. Mackwell; Fe3+/H+ and D/H in kaersutites—Misleading indicators of mantle source fugacities. Geology 1992;; 20 (6): 565–568. doi: https://doi.org/10.1130/0091-7613(1992)020<0565:FHADHI>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 Hornblende megacrysts from basaltic flows in several locations have been studied by means of the electron microprobe, Mössbauer spectroscopy, uranium extraction techniques, and mass spectrometry to define the interrelations between the concentrations of Fe3+ and H+, and the hydrogen isotope partitioning (D/H) in mantle amphiboles. Results indicate a nearly perfect inverse relation between Fe3+ content and H+ content; no relation is observed between D/H partitioning and wt% H2O. A review of diffusion data for amphiboles suggests that the observed increase in Fe3+ content with decreasing H+ content may represent partial dehydration of the amphiboles during ascent. Thus, Fe3+ and H+ contents measured on amphiboles at Earth's surface may not represent mantle conditions. Instead, high Fe3+ contents may be indicative of high H+ contents in the mantle source region rather than high mantle oxygen fugacities. 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.