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Quantification of water in majoritic garnet

Journal Article · · American Mineralogist
DOI:https://doi.org/10.2138/am-2015-5136· OSTI ID:1335511
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [3];  [2];  [6];  [3]
  1. Univ. of Nevada, Las Vegas, NV (United States); Carnegie Institution of Washington
  2. Univ. of Nevada, Las Vegas, NV (United States)
  3. Helmholtz-Zentrum Potsdam, Deutsches GeoForschungsZentrum (GFZ), Potsdam (Germany)
  4. Carnegie Institution of Washington, Washington, D.C. (United States)
  5. Univ. Bayreuth, Bayreuth (Germany)
  6. Dept. of Earth and Planetary Sciences, Evanston, IL (United States)
+ Show Author Affiliations
Majoritic garnet, characterized by an excess of silicon (>3 Si per formula unit), is considered one of the major phases of the Earth’s transition zone from 410-660 km depth. Quantifying the H2O content of nominally anhydrous mantle minerals is necessary to evaluate their water storage capacity from experiments and modeling the Earth’s deep water cycle. We present mineral-specific infrared absorption coefficients for the purpose of quantifying the amount of water incorporated into majorite as hydroxyl point defects. A suite of majoritic garnet samples with varying proportions of Si, Fe, Al, Cr and H2O was synthesized at conditions of 18-19 GPa and 1500-1800°C. Single-crystals were characterized using X-ray diffraction, electron microprobe analysis, secondary Ion Mass spectrometry (SIMS), IR, Raman and Mössbauer spectroscopy. We utilize SIMS and Raman spectroscopy in combination with IR spectroscopy to provide IR absorption coefficients for water in majoritic garnets with the general mineral formula (Mg,Fe)3(Si,Mg,Fe,Al,Cr)2[SiO4]3. Furthermore, the IR absorption coefficient for majoritic garnet in the OH stretching region is frequency-dependent and ranges from 10 470 ± 3100 Lmol-1cm-2 to 23 400 ± 2300 Lmol-1cm-2.
Research Organization:
Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002006
OSTI ID:
1335511
Journal Information:
American Mineralogist, Journal Name: American Mineralogist Journal Issue: 5-6 Vol. 100; ISSN 0003-004X
Publisher:
Mineralogical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

Cited By (2)

Water in the Earth’s Interior: Distribution and Origin book January 2017
Water in the Earth’s Interior: Distribution and Origin journal August 2017

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Related Subjects

36 MATERIALS SCIENCE
IR spectroscopy
Raman spectroscopy
SIMS
high pressure
integral molar absorption coefficient
transition zone
water in nominally anhydrous minerals