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Hydrogen in stishovite, with implications for mantle water content
Stishovite, a high-pressure silicon dioxide mineral, can store significant water in Earth's mantle. Its hydrogen content correlates with aluminum, indicating potential for deep-water storage in subducting slabs.
Area of Science:
- Geochemistry
- Mineralogy
- Petrology
Background:
- Stishovite, a high-pressure polymorph of silicon dioxide, is potentially significant in Earth's mantle.
- Understanding water storage in the mantle is crucial for geological processes.
Purpose of the Study:
- To determine the hydrogen content in synthetic stishovite.
- To investigate the relationship between aluminum content and hydrogen incorporation in stishovite.
Main Methods:
- Synthesis of stishovite samples.
- Fourier transform infrared spectroscopy (FTIR) for hydrogen analysis.
Main Results:
- Hydrogen concentration in stishovite was quantified.
- Hydrogen content is dependent on aluminum (Al2O3) concentration.
- Maximum hydrogen content reached 549 +/- 23 atoms per 10(6) Si atoms at 1.51 wt% Al2O3.
Conclusions:
- Stishovite can incorporate substantial amounts of hydrogen.
- This mineral may act as a water reservoir in deep subducting slabs.
- Stishovite could store water in hot mantle regions where hydrous minerals are unstable.
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