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Quantification of water in majoritic garnet
-
Sylvia-Monique Thomas
,
Kathryn Wilson
Published/Copyright:
May 12, 2015
Abstract
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. 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.
Keywords: IR spectroscopy; water in nominally anhydrous minerals; transition zone; integral molar absorption coefficient; SIMS; high pressure; Raman spectroscopy
Received: 2014-7-21
Accepted: 2014-12-15
Published Online: 2015-5-12
Published in Print: 2015-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
IR spectroscopy;
water in nominally anhydrous minerals;
transition zone;
integral molar absorption coefficient;
SIMS;
high pressure;
Raman spectroscopy
Articles in the same Issue
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- Highlights and Breakthroughs. Zircon dissolution and growth during metamorphism
- Review Paper. Linear partitioning in binary solutions: A review with a novel partitioning array
- Presidential Address. The many facets of apatite
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- Pieczkaite, ideally Mn5(PO4)3Cl, a new apatite-supergroup mineral from Cross Lake, Manitoba, Canada: Description and crystal structure
- First-principles prediction of pressure-enhanced defect segregation and migration at MgO grain boundaries
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