Hydrogen partition coefficients between nominally anhydrous minerals and basaltic melts

Cyril Aubaud, Erik H. Hauri, Marc M. Hirschmann

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245 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)L20611 1-4
JournalGeophysical Research Letters
Volume31
Issue number20
DOIs
StatePublished - Oct 28 2004

Keywords

  • 3630 Mineralogy and petrology: Experimental mineralogy and petrology
  • 3640 Mineralogy and petrology: Igneous petrology
  • 3670 Mineralogy and petrology: Minor and trace element composition

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