Effects of chemical environment on the solubility and incorporation mechanism for hydrogen in olivine
Abstract To investigate the solubility and the sites of incorporation of hydrogen in olivine as a function of point defect concentration, two-stage high-temperature annealing experiments have been carried out. The first annealing stage (the dry preannealing stage) was conducted at a total pressure o...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Bai, Quan [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1993 |
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| Schlagwörter: |
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| Anmerkung: |
© Springer-Verlag 1993 |
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| Übergeordnetes Werk: |
Enthalten in: Physics and chemistry of minerals - Springer-Verlag, 1977, 19(1993), 7 vom: Feb., Seite 460-471 |
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| Übergeordnetes Werk: |
volume:19 ; year:1993 ; number:7 ; month:02 ; pages:460-471 |
| Links: |
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| DOI / URN: |
10.1007/BF00203186 |
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| Katalog-ID: |
OLC2072356504 |
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| 520 | |a Abstract To investigate the solubility and the sites of incorporation of hydrogen in olivine as a function of point defect concentration, two-stage high-temperature annealing experiments have been carried out. The first annealing stage (the dry preannealing stage) was conducted at a total pressure of 0.1 MPa, a temperature of 1300° C and various oxygen fugacities in the range $ 10^{−11} $–$ 10^{−4} $ MPa for times > 12 h. In these heat treatments, the samples were buffered against either orthopyroxene or magnesiowustite, or they remained unbuffered. The second annealing stage (the hydrothermal annealing stage) was performed at 300 MPa and 900–1050 ° C under a hydrogen fugacity of ∼ 158 MPa for 1–5 h. Infrared spectra from the annealed samples revealed two distinct groups of bands. Group I bands occurred at wavenumbers in the range 3450–3650 $ cm^{−1} $, while Group II bands occurred in the range 3200–3450 $ cm^{−1} $. The hydrogen solubility associated with Group I bands is proportional to fO2 to the 1/6 power for samples preannealed in contact with orthopyroxene, to the 1/3 power for samples preannealed in contact with magnesiowustite, and to the 1/13 power for samples preannealed in the absence of a solid-state buffer. The hydrogen concentration for Group II bands varies with fo2 to the 1/3 power for opxbuffered samples, to the 1/2 power for mw-buffered samples, and to the 1/3 power for unbuffered samples. The dependence of hydrogen solubility on oxygen fugacity and orthopyroxene activity suggests that hydrogen is incorporated into the olivine structure via association with point defects. The presence of two distinct groups of absorption bands indicates that hydrogen is associated with two distinct lattice defects. The following point defect model for the mechanism of incorporation of hydrogen in olivine is consistent with these results: Hydrogen ions responsible for the Group I bands are associated with doubly charged oxygen interstitials, while hydrogen ions responsible for the Group II bands are associated with singly charged oxygen interstitials. Furthermore, the infrared bands observed in naturally derived olivines are present in spectra from our hydrothermally annealed crystals. Thus, the mechanisms of incorporation of hydrogen in olivine under geological conditions are the same as those operative under laboratory conditions. The maximum solubility reached in these experiments was ∼ 360H/$ 10^{6} $Si, which corresponds to ∼ 0.002 wt% of $ H_{2} $O. This value is a lower bound for the solubility of hydrogen in olivine under upper mantle conditions. | ||
| 650 | 4 | |a Olivine | |
| 650 | 4 | |a Point Defect | |
| 650 | 4 | |a Hydrogen Concentration | |
| 650 | 4 | |a Defect Model | |
| 650 | 4 | |a Oxygen Fugacity | |
| 700 | 1 | |a Kohlstedt, D. L. |4 aut | |
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10.1007/BF00203186 doi (DE-627)OLC2072356504 (DE-He213)BF00203186-p DE-627 ger DE-627 rakwb eng 550 540 530 VZ BIODIV DE-30 fid Bai, Quan verfasserin aut Effects of chemical environment on the solubility and incorporation mechanism for hydrogen in olivine 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1993 Abstract To investigate the solubility and the sites of incorporation of hydrogen in olivine as a function of point defect concentration, two-stage high-temperature annealing experiments have been carried out. The first annealing stage (the dry preannealing stage) was conducted at a total pressure of 0.1 MPa, a temperature of 1300° C and various oxygen fugacities in the range $ 10^{−11} $–$ 10^{−4} $ MPa for times > 12 h. In these heat treatments, the samples were buffered against either orthopyroxene or magnesiowustite, or they remained unbuffered. The second annealing stage (the hydrothermal annealing stage) was performed at 300 MPa and 900–1050 ° C under a hydrogen fugacity of ∼ 158 MPa for 1–5 h. Infrared spectra from the annealed samples revealed two distinct groups of bands. Group I bands occurred at wavenumbers in the range 3450–3650 $ cm^{−1} $, while Group II bands occurred in the range 3200–3450 $ cm^{−1} $. The hydrogen solubility associated with Group I bands is proportional to fO2 to the 1/6 power for samples preannealed in contact with orthopyroxene, to the 1/3 power for samples preannealed in contact with magnesiowustite, and to the 1/13 power for samples preannealed in the absence of a solid-state buffer. The hydrogen concentration for Group II bands varies with fo2 to the 1/3 power for opxbuffered samples, to the 1/2 power for mw-buffered samples, and to the 1/3 power for unbuffered samples. The dependence of hydrogen solubility on oxygen fugacity and orthopyroxene activity suggests that hydrogen is incorporated into the olivine structure via association with point defects. The presence of two distinct groups of absorption bands indicates that hydrogen is associated with two distinct lattice defects. The following point defect model for the mechanism of incorporation of hydrogen in olivine is consistent with these results: Hydrogen ions responsible for the Group I bands are associated with doubly charged oxygen interstitials, while hydrogen ions responsible for the Group II bands are associated with singly charged oxygen interstitials. Furthermore, the infrared bands observed in naturally derived olivines are present in spectra from our hydrothermally annealed crystals. Thus, the mechanisms of incorporation of hydrogen in olivine under geological conditions are the same as those operative under laboratory conditions. The maximum solubility reached in these experiments was ∼ 360H/$ 10^{6} $Si, which corresponds to ∼ 0.002 wt% of $ H_{2} $O. This value is a lower bound for the solubility of hydrogen in olivine under upper mantle conditions. Olivine Point Defect Hydrogen Concentration Defect Model Oxygen Fugacity Kohlstedt, D. L. aut Enthalten in Physics and chemistry of minerals Springer-Verlag, 1977 19(1993), 7 vom: Feb., Seite 460-471 (DE-627)129323039 (DE-600)131393-9 (DE-576)014557398 0342-1791 nnns volume:19 year:1993 number:7 month:02 pages:460-471 https://doi.org/10.1007/BF00203186 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_11 GBV_ILN_32 GBV_ILN_40 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2010 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_2279 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4112 GBV_ILN_4193 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4319 GBV_ILN_4323 AR 19 1993 7 02 460-471 |
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10.1007/BF00203186 doi (DE-627)OLC2072356504 (DE-He213)BF00203186-p DE-627 ger DE-627 rakwb eng 550 540 530 VZ BIODIV DE-30 fid Bai, Quan verfasserin aut Effects of chemical environment on the solubility and incorporation mechanism for hydrogen in olivine 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1993 Abstract To investigate the solubility and the sites of incorporation of hydrogen in olivine as a function of point defect concentration, two-stage high-temperature annealing experiments have been carried out. The first annealing stage (the dry preannealing stage) was conducted at a total pressure of 0.1 MPa, a temperature of 1300° C and various oxygen fugacities in the range $ 10^{−11} $–$ 10^{−4} $ MPa for times > 12 h. In these heat treatments, the samples were buffered against either orthopyroxene or magnesiowustite, or they remained unbuffered. The second annealing stage (the hydrothermal annealing stage) was performed at 300 MPa and 900–1050 ° C under a hydrogen fugacity of ∼ 158 MPa for 1–5 h. Infrared spectra from the annealed samples revealed two distinct groups of bands. Group I bands occurred at wavenumbers in the range 3450–3650 $ cm^{−1} $, while Group II bands occurred in the range 3200–3450 $ cm^{−1} $. The hydrogen solubility associated with Group I bands is proportional to fO2 to the 1/6 power for samples preannealed in contact with orthopyroxene, to the 1/3 power for samples preannealed in contact with magnesiowustite, and to the 1/13 power for samples preannealed in the absence of a solid-state buffer. The hydrogen concentration for Group II bands varies with fo2 to the 1/3 power for opxbuffered samples, to the 1/2 power for mw-buffered samples, and to the 1/3 power for unbuffered samples. The dependence of hydrogen solubility on oxygen fugacity and orthopyroxene activity suggests that hydrogen is incorporated into the olivine structure via association with point defects. The presence of two distinct groups of absorption bands indicates that hydrogen is associated with two distinct lattice defects. The following point defect model for the mechanism of incorporation of hydrogen in olivine is consistent with these results: Hydrogen ions responsible for the Group I bands are associated with doubly charged oxygen interstitials, while hydrogen ions responsible for the Group II bands are associated with singly charged oxygen interstitials. Furthermore, the infrared bands observed in naturally derived olivines are present in spectra from our hydrothermally annealed crystals. Thus, the mechanisms of incorporation of hydrogen in olivine under geological conditions are the same as those operative under laboratory conditions. The maximum solubility reached in these experiments was ∼ 360H/$ 10^{6} $Si, which corresponds to ∼ 0.002 wt% of $ H_{2} $O. This value is a lower bound for the solubility of hydrogen in olivine under upper mantle conditions. Olivine Point Defect Hydrogen Concentration Defect Model Oxygen Fugacity Kohlstedt, D. L. aut Enthalten in Physics and chemistry of minerals Springer-Verlag, 1977 19(1993), 7 vom: Feb., Seite 460-471 (DE-627)129323039 (DE-600)131393-9 (DE-576)014557398 0342-1791 nnns volume:19 year:1993 number:7 month:02 pages:460-471 https://doi.org/10.1007/BF00203186 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_11 GBV_ILN_32 GBV_ILN_40 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2010 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_2279 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4112 GBV_ILN_4193 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4319 GBV_ILN_4323 AR 19 1993 7 02 460-471 |
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10.1007/BF00203186 doi (DE-627)OLC2072356504 (DE-He213)BF00203186-p DE-627 ger DE-627 rakwb eng 550 540 530 VZ BIODIV DE-30 fid Bai, Quan verfasserin aut Effects of chemical environment on the solubility and incorporation mechanism for hydrogen in olivine 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1993 Abstract To investigate the solubility and the sites of incorporation of hydrogen in olivine as a function of point defect concentration, two-stage high-temperature annealing experiments have been carried out. The first annealing stage (the dry preannealing stage) was conducted at a total pressure of 0.1 MPa, a temperature of 1300° C and various oxygen fugacities in the range $ 10^{−11} $–$ 10^{−4} $ MPa for times > 12 h. In these heat treatments, the samples were buffered against either orthopyroxene or magnesiowustite, or they remained unbuffered. The second annealing stage (the hydrothermal annealing stage) was performed at 300 MPa and 900–1050 ° C under a hydrogen fugacity of ∼ 158 MPa for 1–5 h. Infrared spectra from the annealed samples revealed two distinct groups of bands. Group I bands occurred at wavenumbers in the range 3450–3650 $ cm^{−1} $, while Group II bands occurred in the range 3200–3450 $ cm^{−1} $. The hydrogen solubility associated with Group I bands is proportional to fO2 to the 1/6 power for samples preannealed in contact with orthopyroxene, to the 1/3 power for samples preannealed in contact with magnesiowustite, and to the 1/13 power for samples preannealed in the absence of a solid-state buffer. The hydrogen concentration for Group II bands varies with fo2 to the 1/3 power for opxbuffered samples, to the 1/2 power for mw-buffered samples, and to the 1/3 power for unbuffered samples. The dependence of hydrogen solubility on oxygen fugacity and orthopyroxene activity suggests that hydrogen is incorporated into the olivine structure via association with point defects. The presence of two distinct groups of absorption bands indicates that hydrogen is associated with two distinct lattice defects. The following point defect model for the mechanism of incorporation of hydrogen in olivine is consistent with these results: Hydrogen ions responsible for the Group I bands are associated with doubly charged oxygen interstitials, while hydrogen ions responsible for the Group II bands are associated with singly charged oxygen interstitials. Furthermore, the infrared bands observed in naturally derived olivines are present in spectra from our hydrothermally annealed crystals. Thus, the mechanisms of incorporation of hydrogen in olivine under geological conditions are the same as those operative under laboratory conditions. The maximum solubility reached in these experiments was ∼ 360H/$ 10^{6} $Si, which corresponds to ∼ 0.002 wt% of $ H_{2} $O. This value is a lower bound for the solubility of hydrogen in olivine under upper mantle conditions. Olivine Point Defect Hydrogen Concentration Defect Model Oxygen Fugacity Kohlstedt, D. L. aut Enthalten in Physics and chemistry of minerals Springer-Verlag, 1977 19(1993), 7 vom: Feb., Seite 460-471 (DE-627)129323039 (DE-600)131393-9 (DE-576)014557398 0342-1791 nnns volume:19 year:1993 number:7 month:02 pages:460-471 https://doi.org/10.1007/BF00203186 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_11 GBV_ILN_32 GBV_ILN_40 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2010 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_2279 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4112 GBV_ILN_4193 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4319 GBV_ILN_4323 AR 19 1993 7 02 460-471 |
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10.1007/BF00203186 doi (DE-627)OLC2072356504 (DE-He213)BF00203186-p DE-627 ger DE-627 rakwb eng 550 540 530 VZ BIODIV DE-30 fid Bai, Quan verfasserin aut Effects of chemical environment on the solubility and incorporation mechanism for hydrogen in olivine 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1993 Abstract To investigate the solubility and the sites of incorporation of hydrogen in olivine as a function of point defect concentration, two-stage high-temperature annealing experiments have been carried out. The first annealing stage (the dry preannealing stage) was conducted at a total pressure of 0.1 MPa, a temperature of 1300° C and various oxygen fugacities in the range $ 10^{−11} $–$ 10^{−4} $ MPa for times > 12 h. In these heat treatments, the samples were buffered against either orthopyroxene or magnesiowustite, or they remained unbuffered. The second annealing stage (the hydrothermal annealing stage) was performed at 300 MPa and 900–1050 ° C under a hydrogen fugacity of ∼ 158 MPa for 1–5 h. Infrared spectra from the annealed samples revealed two distinct groups of bands. Group I bands occurred at wavenumbers in the range 3450–3650 $ cm^{−1} $, while Group II bands occurred in the range 3200–3450 $ cm^{−1} $. The hydrogen solubility associated with Group I bands is proportional to fO2 to the 1/6 power for samples preannealed in contact with orthopyroxene, to the 1/3 power for samples preannealed in contact with magnesiowustite, and to the 1/13 power for samples preannealed in the absence of a solid-state buffer. The hydrogen concentration for Group II bands varies with fo2 to the 1/3 power for opxbuffered samples, to the 1/2 power for mw-buffered samples, and to the 1/3 power for unbuffered samples. The dependence of hydrogen solubility on oxygen fugacity and orthopyroxene activity suggests that hydrogen is incorporated into the olivine structure via association with point defects. The presence of two distinct groups of absorption bands indicates that hydrogen is associated with two distinct lattice defects. The following point defect model for the mechanism of incorporation of hydrogen in olivine is consistent with these results: Hydrogen ions responsible for the Group I bands are associated with doubly charged oxygen interstitials, while hydrogen ions responsible for the Group II bands are associated with singly charged oxygen interstitials. Furthermore, the infrared bands observed in naturally derived olivines are present in spectra from our hydrothermally annealed crystals. Thus, the mechanisms of incorporation of hydrogen in olivine under geological conditions are the same as those operative under laboratory conditions. The maximum solubility reached in these experiments was ∼ 360H/$ 10^{6} $Si, which corresponds to ∼ 0.002 wt% of $ H_{2} $O. This value is a lower bound for the solubility of hydrogen in olivine under upper mantle conditions. Olivine Point Defect Hydrogen Concentration Defect Model Oxygen Fugacity Kohlstedt, D. L. aut Enthalten in Physics and chemistry of minerals Springer-Verlag, 1977 19(1993), 7 vom: Feb., Seite 460-471 (DE-627)129323039 (DE-600)131393-9 (DE-576)014557398 0342-1791 nnns volume:19 year:1993 number:7 month:02 pages:460-471 https://doi.org/10.1007/BF00203186 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_11 GBV_ILN_32 GBV_ILN_40 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2010 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_2279 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4112 GBV_ILN_4193 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4319 GBV_ILN_4323 AR 19 1993 7 02 460-471 |
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10.1007/BF00203186 doi (DE-627)OLC2072356504 (DE-He213)BF00203186-p DE-627 ger DE-627 rakwb eng 550 540 530 VZ BIODIV DE-30 fid Bai, Quan verfasserin aut Effects of chemical environment on the solubility and incorporation mechanism for hydrogen in olivine 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1993 Abstract To investigate the solubility and the sites of incorporation of hydrogen in olivine as a function of point defect concentration, two-stage high-temperature annealing experiments have been carried out. The first annealing stage (the dry preannealing stage) was conducted at a total pressure of 0.1 MPa, a temperature of 1300° C and various oxygen fugacities in the range $ 10^{−11} $–$ 10^{−4} $ MPa for times > 12 h. In these heat treatments, the samples were buffered against either orthopyroxene or magnesiowustite, or they remained unbuffered. The second annealing stage (the hydrothermal annealing stage) was performed at 300 MPa and 900–1050 ° C under a hydrogen fugacity of ∼ 158 MPa for 1–5 h. Infrared spectra from the annealed samples revealed two distinct groups of bands. Group I bands occurred at wavenumbers in the range 3450–3650 $ cm^{−1} $, while Group II bands occurred in the range 3200–3450 $ cm^{−1} $. The hydrogen solubility associated with Group I bands is proportional to fO2 to the 1/6 power for samples preannealed in contact with orthopyroxene, to the 1/3 power for samples preannealed in contact with magnesiowustite, and to the 1/13 power for samples preannealed in the absence of a solid-state buffer. The hydrogen concentration for Group II bands varies with fo2 to the 1/3 power for opxbuffered samples, to the 1/2 power for mw-buffered samples, and to the 1/3 power for unbuffered samples. The dependence of hydrogen solubility on oxygen fugacity and orthopyroxene activity suggests that hydrogen is incorporated into the olivine structure via association with point defects. The presence of two distinct groups of absorption bands indicates that hydrogen is associated with two distinct lattice defects. The following point defect model for the mechanism of incorporation of hydrogen in olivine is consistent with these results: Hydrogen ions responsible for the Group I bands are associated with doubly charged oxygen interstitials, while hydrogen ions responsible for the Group II bands are associated with singly charged oxygen interstitials. Furthermore, the infrared bands observed in naturally derived olivines are present in spectra from our hydrothermally annealed crystals. Thus, the mechanisms of incorporation of hydrogen in olivine under geological conditions are the same as those operative under laboratory conditions. The maximum solubility reached in these experiments was ∼ 360H/$ 10^{6} $Si, which corresponds to ∼ 0.002 wt% of $ H_{2} $O. This value is a lower bound for the solubility of hydrogen in olivine under upper mantle conditions. Olivine Point Defect Hydrogen Concentration Defect Model Oxygen Fugacity Kohlstedt, D. L. aut Enthalten in Physics and chemistry of minerals Springer-Verlag, 1977 19(1993), 7 vom: Feb., Seite 460-471 (DE-627)129323039 (DE-600)131393-9 (DE-576)014557398 0342-1791 nnns volume:19 year:1993 number:7 month:02 pages:460-471 https://doi.org/10.1007/BF00203186 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_11 GBV_ILN_32 GBV_ILN_40 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2010 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_2279 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4112 GBV_ILN_4193 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4319 GBV_ILN_4323 AR 19 1993 7 02 460-471 |
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The first annealing stage (the dry preannealing stage) was conducted at a total pressure of 0.1 MPa, a temperature of 1300° C and various oxygen fugacities in the range $ 10^{−11} $–$ 10^{−4} $ MPa for times > 12 h. In these heat treatments, the samples were buffered against either orthopyroxene or magnesiowustite, or they remained unbuffered. The second annealing stage (the hydrothermal annealing stage) was performed at 300 MPa and 900–1050 ° C under a hydrogen fugacity of ∼ 158 MPa for 1–5 h. Infrared spectra from the annealed samples revealed two distinct groups of bands. Group I bands occurred at wavenumbers in the range 3450–3650 $ cm^{−1} $, while Group II bands occurred in the range 3200–3450 $ cm^{−1} $. 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Bai, Quan |
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Effects of chemical environment on the solubility and incorporation mechanism for hydrogen in olivine |
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effects of chemical environment on the solubility and incorporation mechanism for hydrogen in olivine |
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Effects of chemical environment on the solubility and incorporation mechanism for hydrogen in olivine |
| abstract |
Abstract To investigate the solubility and the sites of incorporation of hydrogen in olivine as a function of point defect concentration, two-stage high-temperature annealing experiments have been carried out. The first annealing stage (the dry preannealing stage) was conducted at a total pressure of 0.1 MPa, a temperature of 1300° C and various oxygen fugacities in the range $ 10^{−11} $–$ 10^{−4} $ MPa for times > 12 h. In these heat treatments, the samples were buffered against either orthopyroxene or magnesiowustite, or they remained unbuffered. The second annealing stage (the hydrothermal annealing stage) was performed at 300 MPa and 900–1050 ° C under a hydrogen fugacity of ∼ 158 MPa for 1–5 h. Infrared spectra from the annealed samples revealed two distinct groups of bands. Group I bands occurred at wavenumbers in the range 3450–3650 $ cm^{−1} $, while Group II bands occurred in the range 3200–3450 $ cm^{−1} $. The hydrogen solubility associated with Group I bands is proportional to fO2 to the 1/6 power for samples preannealed in contact with orthopyroxene, to the 1/3 power for samples preannealed in contact with magnesiowustite, and to the 1/13 power for samples preannealed in the absence of a solid-state buffer. The hydrogen concentration for Group II bands varies with fo2 to the 1/3 power for opxbuffered samples, to the 1/2 power for mw-buffered samples, and to the 1/3 power for unbuffered samples. The dependence of hydrogen solubility on oxygen fugacity and orthopyroxene activity suggests that hydrogen is incorporated into the olivine structure via association with point defects. The presence of two distinct groups of absorption bands indicates that hydrogen is associated with two distinct lattice defects. The following point defect model for the mechanism of incorporation of hydrogen in olivine is consistent with these results: Hydrogen ions responsible for the Group I bands are associated with doubly charged oxygen interstitials, while hydrogen ions responsible for the Group II bands are associated with singly charged oxygen interstitials. Furthermore, the infrared bands observed in naturally derived olivines are present in spectra from our hydrothermally annealed crystals. Thus, the mechanisms of incorporation of hydrogen in olivine under geological conditions are the same as those operative under laboratory conditions. The maximum solubility reached in these experiments was ∼ 360H/$ 10^{6} $Si, which corresponds to ∼ 0.002 wt% of $ H_{2} $O. This value is a lower bound for the solubility of hydrogen in olivine under upper mantle conditions. © Springer-Verlag 1993 |
| abstractGer |
Abstract To investigate the solubility and the sites of incorporation of hydrogen in olivine as a function of point defect concentration, two-stage high-temperature annealing experiments have been carried out. The first annealing stage (the dry preannealing stage) was conducted at a total pressure of 0.1 MPa, a temperature of 1300° C and various oxygen fugacities in the range $ 10^{−11} $–$ 10^{−4} $ MPa for times > 12 h. In these heat treatments, the samples were buffered against either orthopyroxene or magnesiowustite, or they remained unbuffered. The second annealing stage (the hydrothermal annealing stage) was performed at 300 MPa and 900–1050 ° C under a hydrogen fugacity of ∼ 158 MPa for 1–5 h. Infrared spectra from the annealed samples revealed two distinct groups of bands. Group I bands occurred at wavenumbers in the range 3450–3650 $ cm^{−1} $, while Group II bands occurred in the range 3200–3450 $ cm^{−1} $. The hydrogen solubility associated with Group I bands is proportional to fO2 to the 1/6 power for samples preannealed in contact with orthopyroxene, to the 1/3 power for samples preannealed in contact with magnesiowustite, and to the 1/13 power for samples preannealed in the absence of a solid-state buffer. The hydrogen concentration for Group II bands varies with fo2 to the 1/3 power for opxbuffered samples, to the 1/2 power for mw-buffered samples, and to the 1/3 power for unbuffered samples. The dependence of hydrogen solubility on oxygen fugacity and orthopyroxene activity suggests that hydrogen is incorporated into the olivine structure via association with point defects. The presence of two distinct groups of absorption bands indicates that hydrogen is associated with two distinct lattice defects. The following point defect model for the mechanism of incorporation of hydrogen in olivine is consistent with these results: Hydrogen ions responsible for the Group I bands are associated with doubly charged oxygen interstitials, while hydrogen ions responsible for the Group II bands are associated with singly charged oxygen interstitials. Furthermore, the infrared bands observed in naturally derived olivines are present in spectra from our hydrothermally annealed crystals. Thus, the mechanisms of incorporation of hydrogen in olivine under geological conditions are the same as those operative under laboratory conditions. The maximum solubility reached in these experiments was ∼ 360H/$ 10^{6} $Si, which corresponds to ∼ 0.002 wt% of $ H_{2} $O. This value is a lower bound for the solubility of hydrogen in olivine under upper mantle conditions. © Springer-Verlag 1993 |
| abstract_unstemmed |
Abstract To investigate the solubility and the sites of incorporation of hydrogen in olivine as a function of point defect concentration, two-stage high-temperature annealing experiments have been carried out. The first annealing stage (the dry preannealing stage) was conducted at a total pressure of 0.1 MPa, a temperature of 1300° C and various oxygen fugacities in the range $ 10^{−11} $–$ 10^{−4} $ MPa for times > 12 h. In these heat treatments, the samples were buffered against either orthopyroxene or magnesiowustite, or they remained unbuffered. The second annealing stage (the hydrothermal annealing stage) was performed at 300 MPa and 900–1050 ° C under a hydrogen fugacity of ∼ 158 MPa for 1–5 h. Infrared spectra from the annealed samples revealed two distinct groups of bands. Group I bands occurred at wavenumbers in the range 3450–3650 $ cm^{−1} $, while Group II bands occurred in the range 3200–3450 $ cm^{−1} $. The hydrogen solubility associated with Group I bands is proportional to fO2 to the 1/6 power for samples preannealed in contact with orthopyroxene, to the 1/3 power for samples preannealed in contact with magnesiowustite, and to the 1/13 power for samples preannealed in the absence of a solid-state buffer. The hydrogen concentration for Group II bands varies with fo2 to the 1/3 power for opxbuffered samples, to the 1/2 power for mw-buffered samples, and to the 1/3 power for unbuffered samples. The dependence of hydrogen solubility on oxygen fugacity and orthopyroxene activity suggests that hydrogen is incorporated into the olivine structure via association with point defects. The presence of two distinct groups of absorption bands indicates that hydrogen is associated with two distinct lattice defects. The following point defect model for the mechanism of incorporation of hydrogen in olivine is consistent with these results: Hydrogen ions responsible for the Group I bands are associated with doubly charged oxygen interstitials, while hydrogen ions responsible for the Group II bands are associated with singly charged oxygen interstitials. Furthermore, the infrared bands observed in naturally derived olivines are present in spectra from our hydrothermally annealed crystals. Thus, the mechanisms of incorporation of hydrogen in olivine under geological conditions are the same as those operative under laboratory conditions. The maximum solubility reached in these experiments was ∼ 360H/$ 10^{6} $Si, which corresponds to ∼ 0.002 wt% of $ H_{2} $O. This value is a lower bound for the solubility of hydrogen in olivine under upper mantle conditions. © Springer-Verlag 1993 |
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The following point defect model for the mechanism of incorporation of hydrogen in olivine is consistent with these results: Hydrogen ions responsible for the Group I bands are associated with doubly charged oxygen interstitials, while hydrogen ions responsible for the Group II bands are associated with singly charged oxygen interstitials. Furthermore, the infrared bands observed in naturally derived olivines are present in spectra from our hydrothermally annealed crystals. Thus, the mechanisms of incorporation of hydrogen in olivine under geological conditions are the same as those operative under laboratory conditions. The maximum solubility reached in these experiments was ∼ 360H/$ 10^{6} $Si, which corresponds to ∼ 0.002 wt% of $ H_{2} $O. 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L.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Enthalten in</subfield><subfield code="t">Physics and chemistry of minerals</subfield><subfield code="d">Springer-Verlag, 1977</subfield><subfield code="g">19(1993), 7 vom: Feb., Seite 460-471</subfield><subfield code="w">(DE-627)129323039</subfield><subfield code="w">(DE-600)131393-9</subfield><subfield code="w">(DE-576)014557398</subfield><subfield code="x">0342-1791</subfield><subfield code="7">nnns</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:19</subfield><subfield code="g">year:1993</subfield><subfield code="g">number:7</subfield><subfield code="g">month:02</subfield><subfield code="g">pages:460-471</subfield></datafield><datafield tag="856" ind1="4" ind2="1"><subfield code="u">https://doi.org/10.1007/BF00203186</subfield><subfield code="z">lizenzpflichtig</subfield><subfield code="3">Volltext</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_A</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SYSFLAG_A</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_OLC</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">FID-BIODIV</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-PHY</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-CHE</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-GEO</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-PHA</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-DE-84</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OPC-GGO</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_11</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_32</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_40</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_70</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_130</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2010</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2018</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2027</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2279</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4012</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4046</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4082</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4103</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4112</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4193</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4306</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4313</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4319</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4323</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">19</subfield><subfield code="j">1993</subfield><subfield code="e">7</subfield><subfield code="c">02</subfield><subfield code="h">460-471</subfield></datafield></record></collection>
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