Hydrogen partitioning between nominally anhydrous upper mantle minerals and melt between 3 and 5 GPa and applications to hydrous peridotite partial melting

Travis J. Tenner; Marc M. Hirschmann; Anthony C. Withers; Richard L. Hervig

doi:10.1016/j.chemgeo.2008.12.006

Hydrogen partitioning between nominally anhydrous upper mantle minerals and melt between 3 and 5 GPa and applications to hydrous peridotite partial melting

Travis J. Tenner, Marc M. Hirschmann, Anthony C. Withers, Richard L. Hervig

Earth and Environmental Sciences-Twin Cities

Research output: Contribution to journal › Article › peer-review

157 Scopus citations

Abstract

To extend our knowledge of partitioning of hydrogen between nominally anhydrous mantle minerals and basaltic melts to higher pressures, we conducted 8 experiments at 3-5GPa and 1350-1440 °C on a modified mid-ocean ridge basalt (MORB)+2wt.% H₂O. H contents in olivine, orthopyroxene, clinopyroxene, and garnet were measured by counting ¹⁶O¹H ions with low-blank SIMS, and total H₂O concentrations in coexisting glasses were measured by FTIR, SIMS, and electron microprobe. The glasses have water contents ranging from 4.1 to 8.9wt.%. Eleven measured pyroxenes have H₂O concentrations ranging from 430 to 1430ppm, two garnets have concentrations of 73 and 260ppm, and one olivine has a concentration of 29ppm. Mineral/melt hydrogen partition coefficients are as follows: D_H^cpx/melt ranges from 0.014-0.021, D_H^opx/melt ranges from 0.009-0.019, D_H^gt/melt ranges from 0.001-0.0033, and D_H^ol/melt has a value of 0.0006. Mineral/mineral hydrogen partitioning data are as follows: D_H^cpx/opxranges from 1.2-2, D_H^cpx/gt has values of 5.5 and 14, and a single D_H^cpx/ol has a value of 27. D_H^pyx/melt correlates with the concentration of Al₂O₃ in pyroxene and with the concentration of Al on tetrahedral sites. Combining the mineral/melt hydrogen partitioning data from this study, and estimates of mineralmodes and compositions along the solidus, we estimate that D_H^perid/melt increases from 0.006 at 1GPa up to 0.01 near the garnet lherzolite/spinel lherzolite transition, owing to the maximum in Al₂O₃ concentration in pyroxenes. With increasing pressure D_H^perid/melt for garnet lherzolite diminishes to 0.005 at 5GPa, as pyroxenes become less aluminous and less abundant. As a result, incipient hydrous melts beneath oceanic ridges with bulkmantle H₂O contents of 50-200 ppmwill have solidus partial melts with H₂O contents between 0.5 and 3.8wt.%, while oceanic island mantle with 300-1000 ppmwill have solidus partial melts with H₂O content between 3 and 20wt.%.

Original language	English (US)
Pages (from-to)	42-56
Number of pages	15
Journal	Chemical Geology
Volume	262
Issue number	1-2
DOIs	https://doi.org/10.1016/j.chemgeo.2008.12.006
State	Published - May 2009

Bibliographical note

Funding Information:
We thank Erik Hauri for his suggestion of SIMS analyses by counting 16 O 1 H ions. We are grateful for NSF support through grants OCE0623550, EAR0456405, and EAR0757903. Helpful reviews were provided by Erik Hauri and Paul Asimow. Parts of this work were carried out in the Institute of Technology Characterization Facility, University of Minnesota, which receives partial support from NSF through the NNIN program. The SIMS analyses were obtained at the Arizona State University National SIMS facility, supported by EAR0622775.

Keywords

Experimental petrology
Hydrogen partitioning
Mantle melting

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@article{8ac152f4a6a545f8905705da2293c82d,

title = "Hydrogen partitioning between nominally anhydrous upper mantle minerals and melt between 3 and 5 GPa and applications to hydrous peridotite partial melting",

abstract = "To extend our knowledge of partitioning of hydrogen between nominally anhydrous mantle minerals and basaltic melts to higher pressures, we conducted 8 experiments at 3-5GPa and 1350-1440 °C on a modified mid-ocean ridge basalt (MORB)+2wt.% H2O. H contents in olivine, orthopyroxene, clinopyroxene, and garnet were measured by counting 16O1H ions with low-blank SIMS, and total H2O concentrations in coexisting glasses were measured by FTIR, SIMS, and electron microprobe. The glasses have water contents ranging from 4.1 to 8.9wt.%. Eleven measured pyroxenes have H2O concentrations ranging from 430 to 1430ppm, two garnets have concentrations of 73 and 260ppm, and one olivine has a concentration of 29ppm. Mineral/melt hydrogen partition coefficients are as follows: DHcpx/melt ranges from 0.014-0.021, DHopx/melt ranges from 0.009-0.019, DHgt/melt ranges from 0.001-0.0033, and DHol/melt has a value of 0.0006. Mineral/mineral hydrogen partitioning data are as follows: DHcpx/opxranges from 1.2-2, DHcpx/gt has values of 5.5 and 14, and a single DHcpx/ol has a value of 27. DHpyx/melt correlates with the concentration of Al2O3 in pyroxene and with the concentration of Al on tetrahedral sites. Combining the mineral/melt hydrogen partitioning data from this study, and estimates of mineralmodes and compositions along the solidus, we estimate that DHperid/melt increases from 0.006 at 1GPa up to 0.01 near the garnet lherzolite/spinel lherzolite transition, owing to the maximum in Al2O3 concentration in pyroxenes. With increasing pressure DHperid/melt for garnet lherzolite diminishes to 0.005 at 5GPa, as pyroxenes become less aluminous and less abundant. As a result, incipient hydrous melts beneath oceanic ridges with bulkmantle H2O contents of 50-200 ppmwill have solidus partial melts with H2O contents between 0.5 and 3.8wt.%, while oceanic island mantle with 300-1000 ppmwill have solidus partial melts with H2O content between 3 and 20wt.%.",

keywords = "Experimental petrology, Hydrogen partitioning, Mantle melting",

author = "Tenner, {Travis J.} and Hirschmann, {Marc M.} and Withers, {Anthony C.} and Hervig, {Richard L.}",

note = "Funding Information: We thank Erik Hauri for his suggestion of SIMS analyses by counting 16 O 1 H ions. We are grateful for NSF support through grants OCE0623550, EAR0456405, and EAR0757903. Helpful reviews were provided by Erik Hauri and Paul Asimow. Parts of this work were carried out in the Institute of Technology Characterization Facility, University of Minnesota, which receives partial support from NSF through the NNIN program. The SIMS analyses were obtained at the Arizona State University National SIMS facility, supported by EAR0622775.",

year = "2009",

month = may,

doi = "10.1016/j.chemgeo.2008.12.006",

language = "English (US)",

volume = "262",

pages = "42--56",

journal = "Chemical Geology",

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T1 - Hydrogen partitioning between nominally anhydrous upper mantle minerals and melt between 3 and 5 GPa and applications to hydrous peridotite partial melting

AU - Tenner, Travis J.

AU - Hirschmann, Marc M.

AU - Withers, Anthony C.

AU - Hervig, Richard L.

N1 - Funding Information: We thank Erik Hauri for his suggestion of SIMS analyses by counting 16 O 1 H ions. We are grateful for NSF support through grants OCE0623550, EAR0456405, and EAR0757903. Helpful reviews were provided by Erik Hauri and Paul Asimow. Parts of this work were carried out in the Institute of Technology Characterization Facility, University of Minnesota, which receives partial support from NSF through the NNIN program. The SIMS analyses were obtained at the Arizona State University National SIMS facility, supported by EAR0622775.

PY - 2009/5

Y1 - 2009/5

N2 - To extend our knowledge of partitioning of hydrogen between nominally anhydrous mantle minerals and basaltic melts to higher pressures, we conducted 8 experiments at 3-5GPa and 1350-1440 °C on a modified mid-ocean ridge basalt (MORB)+2wt.% H2O. H contents in olivine, orthopyroxene, clinopyroxene, and garnet were measured by counting 16O1H ions with low-blank SIMS, and total H2O concentrations in coexisting glasses were measured by FTIR, SIMS, and electron microprobe. The glasses have water contents ranging from 4.1 to 8.9wt.%. Eleven measured pyroxenes have H2O concentrations ranging from 430 to 1430ppm, two garnets have concentrations of 73 and 260ppm, and one olivine has a concentration of 29ppm. Mineral/melt hydrogen partition coefficients are as follows: DHcpx/melt ranges from 0.014-0.021, DHopx/melt ranges from 0.009-0.019, DHgt/melt ranges from 0.001-0.0033, and DHol/melt has a value of 0.0006. Mineral/mineral hydrogen partitioning data are as follows: DHcpx/opxranges from 1.2-2, DHcpx/gt has values of 5.5 and 14, and a single DHcpx/ol has a value of 27. DHpyx/melt correlates with the concentration of Al2O3 in pyroxene and with the concentration of Al on tetrahedral sites. Combining the mineral/melt hydrogen partitioning data from this study, and estimates of mineralmodes and compositions along the solidus, we estimate that DHperid/melt increases from 0.006 at 1GPa up to 0.01 near the garnet lherzolite/spinel lherzolite transition, owing to the maximum in Al2O3 concentration in pyroxenes. With increasing pressure DHperid/melt for garnet lherzolite diminishes to 0.005 at 5GPa, as pyroxenes become less aluminous and less abundant. As a result, incipient hydrous melts beneath oceanic ridges with bulkmantle H2O contents of 50-200 ppmwill have solidus partial melts with H2O contents between 0.5 and 3.8wt.%, while oceanic island mantle with 300-1000 ppmwill have solidus partial melts with H2O content between 3 and 20wt.%.

AB - To extend our knowledge of partitioning of hydrogen between nominally anhydrous mantle minerals and basaltic melts to higher pressures, we conducted 8 experiments at 3-5GPa and 1350-1440 °C on a modified mid-ocean ridge basalt (MORB)+2wt.% H2O. H contents in olivine, orthopyroxene, clinopyroxene, and garnet were measured by counting 16O1H ions with low-blank SIMS, and total H2O concentrations in coexisting glasses were measured by FTIR, SIMS, and electron microprobe. The glasses have water contents ranging from 4.1 to 8.9wt.%. Eleven measured pyroxenes have H2O concentrations ranging from 430 to 1430ppm, two garnets have concentrations of 73 and 260ppm, and one olivine has a concentration of 29ppm. Mineral/melt hydrogen partition coefficients are as follows: DHcpx/melt ranges from 0.014-0.021, DHopx/melt ranges from 0.009-0.019, DHgt/melt ranges from 0.001-0.0033, and DHol/melt has a value of 0.0006. Mineral/mineral hydrogen partitioning data are as follows: DHcpx/opxranges from 1.2-2, DHcpx/gt has values of 5.5 and 14, and a single DHcpx/ol has a value of 27. DHpyx/melt correlates with the concentration of Al2O3 in pyroxene and with the concentration of Al on tetrahedral sites. Combining the mineral/melt hydrogen partitioning data from this study, and estimates of mineralmodes and compositions along the solidus, we estimate that DHperid/melt increases from 0.006 at 1GPa up to 0.01 near the garnet lherzolite/spinel lherzolite transition, owing to the maximum in Al2O3 concentration in pyroxenes. With increasing pressure DHperid/melt for garnet lherzolite diminishes to 0.005 at 5GPa, as pyroxenes become less aluminous and less abundant. As a result, incipient hydrous melts beneath oceanic ridges with bulkmantle H2O contents of 50-200 ppmwill have solidus partial melts with H2O contents between 0.5 and 3.8wt.%, while oceanic island mantle with 300-1000 ppmwill have solidus partial melts with H2O content between 3 and 20wt.%.

KW - Experimental petrology

KW - Hydrogen partitioning

KW - Mantle melting

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Hydrogen partitioning between nominally anhydrous upper mantle minerals and melt between 3 and 5 GPa and applications to hydrous peridotite partial melting

Abstract

Bibliographical note

Keywords

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Electron Microprobe Laboratory

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Hydrogen partitioning between nominally anhydrous upper mantle minerals and melt between 3 and 5 GPa and applications to hydrous peridotite partial melting

Abstract

Bibliographical note

Keywords

Access

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Other files and links

Fingerprint

Equipment

Electron Microprobe Laboratory

Cite this