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Hydrogen partition coefficients between nominally anhydrous minerals and basaltic melts
Author(s) -
Aubaud Cyril,
Hauri Erik H.,
Hirschmann Marc M.
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl021341
Subject(s) - peridotite , mantle (geology) , partition coefficient , olivine , anhydrous , solidus , basalt , geology , partial melting , mineralogy , analytical chemistry (journal) , amphibole , geochemistry , chemistry , materials science , environmental chemistry , quartz , metallurgy , chromatography , paleontology , alloy , organic chemistry
We have measured hydrogen partition coefficients between nominally anhydrous minerals (olivine, pyroxenes) and basaltic melts in 13 hydrous melting experiments performed at upper mantle P‐T conditions (1–2 GPa and 1230–1380°C). Resulting liquids have 3.1–6.4 wt.% H 2 O and average mineral/melt partition coefficients as follows: D H ol/melt = 0.0017 ± 0.0005 (n = 9), D H opx/melt = 0.019 ± 0.004 (n = 8), and D H cpx/melt = 0.023 ± 0.005 (n = 2). Mineral/mineral partition coefficients are D H ol/opx = 0.11 ± 0.01 (n = 4), D H ol/cpx = 0.08 ± 0.01 (n = 2) and D H cpx/opx = 1.4 ± 0.3 (n = 1). These measurements confirm that water behaves similarly to Ce during mantle melting ( D H peridotite/melt is ∼0.009). For mantle water concentrations of 50–200 ppm, the onset of melting is 5–20 km deeper than the dry solidus, less than previous estimates.