Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Molecular hydrogen in minerals as a clue to interpret ∂D variations in the mantle. / Moine, B. N.; Bolfan-Casanova, N.; Radu, I. B. и др.
в: Nature Communications, Том 11, № 1, 3604, 17.07.2020.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Molecular hydrogen in minerals as a clue to interpret ∂D variations in the mantle
AU - Moine, B. N.
AU - Bolfan-Casanova, N.
AU - Radu, I. B.
AU - Ionov, D. A.
AU - Costin, G.
AU - Korsakov, A. V.
AU - Golovin, A. V.
AU - Oleinikov, O. B.
AU - Deloule, E.
AU - Cottin, J. Y.
PY - 2020/7/17
Y1 - 2020/7/17
N2 - Trace amounts of water dissolved in minerals affect density, viscosity and melting behaviour of the Earth’s mantle and play an important role in global tectonics, magmatism and volatile cycle. Water concentrations and the ratios of hydrogen isotopes in the mantle give insight into these processes, as well as into the origin of terrestrial water. Here we show the presence of molecular H2 in minerals (omphacites) from eclogites from the Kaapvaal and Siberian cratons. These omphacites contain both high amounts of H2 (70 to 460 wt. ppm) and OH. Furthermore, their ∂D values increase with dehydration, suggesting a positive H isotope fractionation factor between minerals and H2–bearing fluid, contrary to what is expected in case of isotopic exchange between minerals and H2O-fluids. The possibility of incorporation of large quantities of H as H2 in nominally anhydrous minerals implies that the storage capacity of H in the mantle may have been underestimated, and sheds new light on H isotope variations in mantle magmas and minerals.
AB - Trace amounts of water dissolved in minerals affect density, viscosity and melting behaviour of the Earth’s mantle and play an important role in global tectonics, magmatism and volatile cycle. Water concentrations and the ratios of hydrogen isotopes in the mantle give insight into these processes, as well as into the origin of terrestrial water. Here we show the presence of molecular H2 in minerals (omphacites) from eclogites from the Kaapvaal and Siberian cratons. These omphacites contain both high amounts of H2 (70 to 460 wt. ppm) and OH. Furthermore, their ∂D values increase with dehydration, suggesting a positive H isotope fractionation factor between minerals and H2–bearing fluid, contrary to what is expected in case of isotopic exchange between minerals and H2O-fluids. The possibility of incorporation of large quantities of H as H2 in nominally anhydrous minerals implies that the storage capacity of H in the mantle may have been underestimated, and sheds new light on H isotope variations in mantle magmas and minerals.
KW - ISOTOPE FRACTIONATION
KW - LITHOSPHERIC MANTLE
KW - OXYGEN FUGACITY
KW - WATER-CONTENT
KW - SILICATE MELTS
KW - PERIDOTITE
KW - DIFFUSION
KW - OLIVINE
KW - STATE
KW - D/H
UR - http://www.scopus.com/inward/record.url?scp=85088133618&partnerID=8YFLogxK
U2 - 10.1038/s41467-020-17442-8
DO - 10.1038/s41467-020-17442-8
M3 - Article
C2 - 32681113
AN - SCOPUS:85088133618
VL - 11
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 3604
ER -
ID: 24785097