TY - JOUR
T1 - Hydrogen partition coefficients between nominally anhydrous minerals and basaltic melts
AU - Aubaud, Cyril
AU - Hauri, Erik H.
AU - Hirschmann, Marc M.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/10/28
Y1 - 2004/10/28
N2 - 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.% H2O and average mineral/melt partition coefficients as follows: D Hol/melt = 0.0017 ± 0.0005 (n = 9), DHopx/melt =0.019 ± 0.004 (n = 8 , and DHcpx/melt = 0.023 ± 0.005 (n = 2). Mineral/mineral partition coefficients are DH ol/opx = 0.11 ± 0.01 (n = 4), DH ol/cpx = 0.08 ± 0.01 (n = 2) and DH cpx/opx = 1.4 ± 0.3 (n = 1). These measurements confirm that water behaves similarly to Ce during mantle melting (DHperidotite/melt is ∼0.009). For mantlewater concentrations of 50-200 ppm, the onset of melting is 5-20 km deeper than the dry solidus, less than previous estimates.
AB - 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.% H2O and average mineral/melt partition coefficients as follows: D Hol/melt = 0.0017 ± 0.0005 (n = 9), DHopx/melt =0.019 ± 0.004 (n = 8 , and DHcpx/melt = 0.023 ± 0.005 (n = 2). Mineral/mineral partition coefficients are DH ol/opx = 0.11 ± 0.01 (n = 4), DH ol/cpx = 0.08 ± 0.01 (n = 2) and DH cpx/opx = 1.4 ± 0.3 (n = 1). These measurements confirm that water behaves similarly to Ce during mantle melting (DHperidotite/melt is ∼0.009). For mantlewater concentrations of 50-200 ppm, the onset of melting is 5-20 km deeper than the dry solidus, less than previous estimates.
KW - 3630 Mineralogy and petrology: Experimental mineralogy and petrology
KW - 3640 Mineralogy and petrology: Igneous petrology
KW - 3670 Mineralogy and petrology: Minor and trace element composition
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U2 - 10.1029/2004GL021341
DO - 10.1029/2004GL021341
M3 - Article
AN - SCOPUS:11844267155
SN - 0094-8276
VL - 31
SP - L20611 1-4
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 20
ER -