Quantitative analysis of trace OH in garnet and pyroxenes

Other| June 01, 1995 Quantitative analysis of trace OH in garnet and pyroxenes David R. Bell; David R. Bell California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States Search for other works by this author on: GSW Google Scholar Phillip D. Ihinger; Phillip D. Ihinger Search for other works by this author on: GSW Google Scholar George R. Rossman George R. Rossman Search for other works by this author on: GSW Google Scholar American Mineralogist (1995) 80 (5-6): 465–474. https://doi.org/10.2138/am-1995-5-607 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation David R. Bell, Phillip D. Ihinger, George R. Rossman; Quantitative analysis of trace OH in garnet and pyroxenes. American Mineralogist 1995;; 80 (5-6): 465–474. doi: https://doi.org/10.2138/am-1995-5-607 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 SocietyAmerican Mineralogist Search Advanced Search Abstract To calibrate infrared (IR) spectroscopy for quantitative analysis of trace structural OH in specific minerals, we have determined concentrations of H in pure separates of mantle-derived pyrope garnet (56 ± 6 ppm H2O by weight), augite (268 ± 8, ppm H2O), and enstatite (217 ± 11 ppm H2O) by manometry after heating the samples and extracting H2 gas under vacuum. IR spectroscopy confirmed the presence of intrinsic OH in these samples prior to extraction and indicated between 86 and 100% removal of H during the extraction procedure. The integral specific absorption coefficients of 1.39 ± 0.14 (1σ), 7.09 ± 0.32, and 15.6 ± 0.94 /(ppm H2O·cm2) for pyrope, augite, and enstatite, respectively, allow precise spectroscopic determination of the OH content of upper mantle garnets and pyroxenes to concentration levels of a few parts per million. Uncertainties in accuracy depend on mineral composition and characteristics of the OH absorption spectrum and are estimated to range between ±10 and ±50%. 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.