4.5 Article

Water in natural olivine-determined by proton-proton scattering analysis

Journal

AMERICAN MINERALOGIST
Volume 93, Issue 10, Pages 1613-1619

Publisher

MINERALOGICAL SOC AMER
DOI: 10.2138/am.2008.2835

Keywords

Hydroxyl defects; olivine; peridotite; proton-proton scattering; nominally anhydrous minerals; water content

Funding

  1. STAEDTLER-Stiftung
  2. Maier-Leibnitz-Laboratorium der LMU
  3. TU Munchen

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Here we present water concentration data for olivine from different host rocks, measured with a nuclear technique using proton-proton scattering. This method, which is used here for the first time on olivine, is very powerful for determining trace amounts of water. The studied olivine specimens differ in their H2O contents, ranging from 4 to 51 wt ppm (=10-117 atom ppm H). The lowest concentrations are found in olivine from spinel peridotite xenoliths, the highest concentrations in olivine from alpine-type peridotite; the contents of an ophiolitic and a hydrothermal olivine are intermediate. Infrared spectroscopy was applied to ensure that the measured water contents stein solely from hydroxyl defects in the mineral structure. The infrared spectra differ from sample to sample. Five of six olivine specimens show absorption bands typical of hydroxyl groups associated with Ti defects. These olivines differ in their Ti contents by two orders of magnitude. However, a correlation of water and Ti content was not observed.

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