Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C
Abstract We have experimentally studied the behavior of oxygen isotope composition in silicate melts with a wide range of network-forming cations. Isotopic equilibration of the Di-An eutectic melts modified by addition of Si, Al, Ti, and Fe was carried out in a vertical tube furnace within a tempera...
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| Autor*in: |
Borisov, A. A. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2014 |
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| Schlagwörter: |
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| Anmerkung: |
© Pleiades Publishing, Ltd. 2014 |
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| Übergeordnetes Werk: |
Enthalten in: Petrology - Moscow : MAIK Nauka/Interperiodica Publ. [u.a.], 1996, 22(2014), 4 vom: Juli, Seite 359-380 |
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| Übergeordnetes Werk: |
volume:22 ; year:2014 ; number:4 ; month:07 ; pages:359-380 |
| Links: |
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| DOI / URN: |
10.1134/S086959111404002X |
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| Katalog-ID: |
SPR020203233 |
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| 100 | 1 | |a Borisov, A. A. |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C |
| 264 | 1 | |c 2014 | |
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| 520 | |a Abstract We have experimentally studied the behavior of oxygen isotope composition in silicate melts with a wide range of network-forming cations. Isotopic equilibration of the Di-An eutectic melts modified by addition of Si, Al, Ti, and Fe was carried out in a vertical tube furnace within a temperature range from 1400 to 1570°C. It was established that the value 103Lnα between silicic and basic melts at 1400 and 1450°C systematically increases with increase of $ SiO_{2} $ content, reaching ≈1‰ at 20% melt silica enrichment. The effect of the $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents was studied at 1500°C. An increase in $ Fe_{2} %$ O_{3} $ from 5 to 20 wt % causes a 0.4‰ increase of $ δ^{18} $O. An increase in Ti and Al contents results in the non-linear behavior of $ δ^{18} $O, which decreases in the region of the highest $ TiO_{2} $ (28.4%) and $ Al_{2} %$ O_{3} $ (29.3 %) contents. In the region of moderate $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents, the values of $ δ^{18} $O show monotonous linear dependence on the oxide contents. Methods of estimations of oxygen isotope fractionation coefficients at T > 1400°C in the studied range of network-forming oxides are considered on the basis of experimental data. The calculation of fractionation coefficients with the use of $ I^{18} $O index showed that experimental values with increase of $ SiO_{2} $ content deviate from calculated values by 0.3‰ for basic melts and 0.5–0.6‰ in the region of silicic melts. Similar pattern is observed during approximation of a melt by normative mineral composition. The calculation with the Garlick index leads to the systematic underestimation (on average, by 0.3‰) of $ 10^{3} $Lnα as compared to the experimental data. The NBO/T ratio appeared the best parameter to describe $ 10^{3} $Lnα in the melt-melt system, including the region of high-Fe melts. Analysis of experimental data leads us to conclude that the degree of polymerization of the melts in the studied temperature-composition region is the most important factor affecting the oxygen-isotope fractionation in the melt-melt system. Empirical index similar to the Garlick index was proposed to take into account oxygen associated with T-cations: %$I^m = (C_{Si} + aC_{Al} + bC_{Ti} + cC_{Fe^{3 + } } )/\Sigma C_i ,%$ where a, b, and c constants are empirically established coefficients: 0.75, 0. 70, and 1.75, respectively. | ||
| 650 | 4 | |a Oxygen Isotope |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Isotope Fractionation |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Isotope Shift |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Oxygen Isotope Composition |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Tridymite |7 (dpeaa)DE-He213 | |
| 700 | 1 | |a Dubinina, E. O. |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t Petrology |d Moscow : MAIK Nauka/Interperiodica Publ. [u.a.], 1996 |g 22(2014), 4 vom: Juli, Seite 359-380 |w (DE-627)511882602 |w (DE-600)2235750-6 |x 1556-2085 |7 nnns |
| 773 | 1 | 8 | |g volume:22 |g year:2014 |g number:4 |g month:07 |g pages:359-380 |
| 856 | 4 | 0 | |u https://dx.doi.org/10.1134/S086959111404002X |z lizenzpflichtig |3 Volltext |
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10.1134/S086959111404002X doi (DE-627)SPR020203233 (SPR)S086959111404002X-e DE-627 ger DE-627 rakwb eng Borisov, A. A. verfasserin aut Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Pleiades Publishing, Ltd. 2014 Abstract We have experimentally studied the behavior of oxygen isotope composition in silicate melts with a wide range of network-forming cations. Isotopic equilibration of the Di-An eutectic melts modified by addition of Si, Al, Ti, and Fe was carried out in a vertical tube furnace within a temperature range from 1400 to 1570°C. It was established that the value 103Lnα between silicic and basic melts at 1400 and 1450°C systematically increases with increase of $ SiO_{2} $ content, reaching ≈1‰ at 20% melt silica enrichment. The effect of the $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents was studied at 1500°C. An increase in $ Fe_{2} %$ O_{3} $ from 5 to 20 wt % causes a 0.4‰ increase of $ δ^{18} $O. An increase in Ti and Al contents results in the non-linear behavior of $ δ^{18} $O, which decreases in the region of the highest $ TiO_{2} $ (28.4%) and $ Al_{2} %$ O_{3} $ (29.3 %) contents. In the region of moderate $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents, the values of $ δ^{18} $O show monotonous linear dependence on the oxide contents. Methods of estimations of oxygen isotope fractionation coefficients at T > 1400°C in the studied range of network-forming oxides are considered on the basis of experimental data. The calculation of fractionation coefficients with the use of $ I^{18} $O index showed that experimental values with increase of $ SiO_{2} $ content deviate from calculated values by 0.3‰ for basic melts and 0.5–0.6‰ in the region of silicic melts. Similar pattern is observed during approximation of a melt by normative mineral composition. The calculation with the Garlick index leads to the systematic underestimation (on average, by 0.3‰) of $ 10^{3} $Lnα as compared to the experimental data. The NBO/T ratio appeared the best parameter to describe $ 10^{3} $Lnα in the melt-melt system, including the region of high-Fe melts. Analysis of experimental data leads us to conclude that the degree of polymerization of the melts in the studied temperature-composition region is the most important factor affecting the oxygen-isotope fractionation in the melt-melt system. Empirical index similar to the Garlick index was proposed to take into account oxygen associated with T-cations: %$I^m = (C_{Si} + aC_{Al} + bC_{Ti} + cC_{Fe^{3 + } } )/\Sigma C_i ,%$ where a, b, and c constants are empirically established coefficients: 0.75, 0. 70, and 1.75, respectively. Oxygen Isotope (dpeaa)DE-He213 Isotope Fractionation (dpeaa)DE-He213 Isotope Shift (dpeaa)DE-He213 Oxygen Isotope Composition (dpeaa)DE-He213 Tridymite (dpeaa)DE-He213 Dubinina, E. O. aut Enthalten in Petrology Moscow : MAIK Nauka/Interperiodica Publ. [u.a.], 1996 22(2014), 4 vom: Juli, Seite 359-380 (DE-627)511882602 (DE-600)2235750-6 1556-2085 nnns volume:22 year:2014 number:4 month:07 pages:359-380 https://dx.doi.org/10.1134/S086959111404002X lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 22 2014 4 07 359-380 |
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10.1134/S086959111404002X doi (DE-627)SPR020203233 (SPR)S086959111404002X-e DE-627 ger DE-627 rakwb eng Borisov, A. A. verfasserin aut Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Pleiades Publishing, Ltd. 2014 Abstract We have experimentally studied the behavior of oxygen isotope composition in silicate melts with a wide range of network-forming cations. Isotopic equilibration of the Di-An eutectic melts modified by addition of Si, Al, Ti, and Fe was carried out in a vertical tube furnace within a temperature range from 1400 to 1570°C. It was established that the value 103Lnα between silicic and basic melts at 1400 and 1450°C systematically increases with increase of $ SiO_{2} $ content, reaching ≈1‰ at 20% melt silica enrichment. The effect of the $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents was studied at 1500°C. An increase in $ Fe_{2} %$ O_{3} $ from 5 to 20 wt % causes a 0.4‰ increase of $ δ^{18} $O. An increase in Ti and Al contents results in the non-linear behavior of $ δ^{18} $O, which decreases in the region of the highest $ TiO_{2} $ (28.4%) and $ Al_{2} %$ O_{3} $ (29.3 %) contents. In the region of moderate $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents, the values of $ δ^{18} $O show monotonous linear dependence on the oxide contents. Methods of estimations of oxygen isotope fractionation coefficients at T > 1400°C in the studied range of network-forming oxides are considered on the basis of experimental data. The calculation of fractionation coefficients with the use of $ I^{18} $O index showed that experimental values with increase of $ SiO_{2} $ content deviate from calculated values by 0.3‰ for basic melts and 0.5–0.6‰ in the region of silicic melts. Similar pattern is observed during approximation of a melt by normative mineral composition. The calculation with the Garlick index leads to the systematic underestimation (on average, by 0.3‰) of $ 10^{3} $Lnα as compared to the experimental data. The NBO/T ratio appeared the best parameter to describe $ 10^{3} $Lnα in the melt-melt system, including the region of high-Fe melts. Analysis of experimental data leads us to conclude that the degree of polymerization of the melts in the studied temperature-composition region is the most important factor affecting the oxygen-isotope fractionation in the melt-melt system. Empirical index similar to the Garlick index was proposed to take into account oxygen associated with T-cations: %$I^m = (C_{Si} + aC_{Al} + bC_{Ti} + cC_{Fe^{3 + } } )/\Sigma C_i ,%$ where a, b, and c constants are empirically established coefficients: 0.75, 0. 70, and 1.75, respectively. Oxygen Isotope (dpeaa)DE-He213 Isotope Fractionation (dpeaa)DE-He213 Isotope Shift (dpeaa)DE-He213 Oxygen Isotope Composition (dpeaa)DE-He213 Tridymite (dpeaa)DE-He213 Dubinina, E. O. aut Enthalten in Petrology Moscow : MAIK Nauka/Interperiodica Publ. [u.a.], 1996 22(2014), 4 vom: Juli, Seite 359-380 (DE-627)511882602 (DE-600)2235750-6 1556-2085 nnns volume:22 year:2014 number:4 month:07 pages:359-380 https://dx.doi.org/10.1134/S086959111404002X lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 22 2014 4 07 359-380 |
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10.1134/S086959111404002X doi (DE-627)SPR020203233 (SPR)S086959111404002X-e DE-627 ger DE-627 rakwb eng Borisov, A. A. verfasserin aut Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Pleiades Publishing, Ltd. 2014 Abstract We have experimentally studied the behavior of oxygen isotope composition in silicate melts with a wide range of network-forming cations. Isotopic equilibration of the Di-An eutectic melts modified by addition of Si, Al, Ti, and Fe was carried out in a vertical tube furnace within a temperature range from 1400 to 1570°C. It was established that the value 103Lnα between silicic and basic melts at 1400 and 1450°C systematically increases with increase of $ SiO_{2} $ content, reaching ≈1‰ at 20% melt silica enrichment. The effect of the $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents was studied at 1500°C. An increase in $ Fe_{2} %$ O_{3} $ from 5 to 20 wt % causes a 0.4‰ increase of $ δ^{18} $O. An increase in Ti and Al contents results in the non-linear behavior of $ δ^{18} $O, which decreases in the region of the highest $ TiO_{2} $ (28.4%) and $ Al_{2} %$ O_{3} $ (29.3 %) contents. In the region of moderate $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents, the values of $ δ^{18} $O show monotonous linear dependence on the oxide contents. Methods of estimations of oxygen isotope fractionation coefficients at T > 1400°C in the studied range of network-forming oxides are considered on the basis of experimental data. The calculation of fractionation coefficients with the use of $ I^{18} $O index showed that experimental values with increase of $ SiO_{2} $ content deviate from calculated values by 0.3‰ for basic melts and 0.5–0.6‰ in the region of silicic melts. Similar pattern is observed during approximation of a melt by normative mineral composition. The calculation with the Garlick index leads to the systematic underestimation (on average, by 0.3‰) of $ 10^{3} $Lnα as compared to the experimental data. The NBO/T ratio appeared the best parameter to describe $ 10^{3} $Lnα in the melt-melt system, including the region of high-Fe melts. Analysis of experimental data leads us to conclude that the degree of polymerization of the melts in the studied temperature-composition region is the most important factor affecting the oxygen-isotope fractionation in the melt-melt system. Empirical index similar to the Garlick index was proposed to take into account oxygen associated with T-cations: %$I^m = (C_{Si} + aC_{Al} + bC_{Ti} + cC_{Fe^{3 + } } )/\Sigma C_i ,%$ where a, b, and c constants are empirically established coefficients: 0.75, 0. 70, and 1.75, respectively. Oxygen Isotope (dpeaa)DE-He213 Isotope Fractionation (dpeaa)DE-He213 Isotope Shift (dpeaa)DE-He213 Oxygen Isotope Composition (dpeaa)DE-He213 Tridymite (dpeaa)DE-He213 Dubinina, E. O. aut Enthalten in Petrology Moscow : MAIK Nauka/Interperiodica Publ. [u.a.], 1996 22(2014), 4 vom: Juli, Seite 359-380 (DE-627)511882602 (DE-600)2235750-6 1556-2085 nnns volume:22 year:2014 number:4 month:07 pages:359-380 https://dx.doi.org/10.1134/S086959111404002X lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 22 2014 4 07 359-380 |
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10.1134/S086959111404002X doi (DE-627)SPR020203233 (SPR)S086959111404002X-e DE-627 ger DE-627 rakwb eng Borisov, A. A. verfasserin aut Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Pleiades Publishing, Ltd. 2014 Abstract We have experimentally studied the behavior of oxygen isotope composition in silicate melts with a wide range of network-forming cations. Isotopic equilibration of the Di-An eutectic melts modified by addition of Si, Al, Ti, and Fe was carried out in a vertical tube furnace within a temperature range from 1400 to 1570°C. It was established that the value 103Lnα between silicic and basic melts at 1400 and 1450°C systematically increases with increase of $ SiO_{2} $ content, reaching ≈1‰ at 20% melt silica enrichment. The effect of the $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents was studied at 1500°C. An increase in $ Fe_{2} %$ O_{3} $ from 5 to 20 wt % causes a 0.4‰ increase of $ δ^{18} $O. An increase in Ti and Al contents results in the non-linear behavior of $ δ^{18} $O, which decreases in the region of the highest $ TiO_{2} $ (28.4%) and $ Al_{2} %$ O_{3} $ (29.3 %) contents. In the region of moderate $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents, the values of $ δ^{18} $O show monotonous linear dependence on the oxide contents. Methods of estimations of oxygen isotope fractionation coefficients at T > 1400°C in the studied range of network-forming oxides are considered on the basis of experimental data. The calculation of fractionation coefficients with the use of $ I^{18} $O index showed that experimental values with increase of $ SiO_{2} $ content deviate from calculated values by 0.3‰ for basic melts and 0.5–0.6‰ in the region of silicic melts. Similar pattern is observed during approximation of a melt by normative mineral composition. The calculation with the Garlick index leads to the systematic underestimation (on average, by 0.3‰) of $ 10^{3} $Lnα as compared to the experimental data. The NBO/T ratio appeared the best parameter to describe $ 10^{3} $Lnα in the melt-melt system, including the region of high-Fe melts. Analysis of experimental data leads us to conclude that the degree of polymerization of the melts in the studied temperature-composition region is the most important factor affecting the oxygen-isotope fractionation in the melt-melt system. Empirical index similar to the Garlick index was proposed to take into account oxygen associated with T-cations: %$I^m = (C_{Si} + aC_{Al} + bC_{Ti} + cC_{Fe^{3 + } } )/\Sigma C_i ,%$ where a, b, and c constants are empirically established coefficients: 0.75, 0. 70, and 1.75, respectively. Oxygen Isotope (dpeaa)DE-He213 Isotope Fractionation (dpeaa)DE-He213 Isotope Shift (dpeaa)DE-He213 Oxygen Isotope Composition (dpeaa)DE-He213 Tridymite (dpeaa)DE-He213 Dubinina, E. O. aut Enthalten in Petrology Moscow : MAIK Nauka/Interperiodica Publ. [u.a.], 1996 22(2014), 4 vom: Juli, Seite 359-380 (DE-627)511882602 (DE-600)2235750-6 1556-2085 nnns volume:22 year:2014 number:4 month:07 pages:359-380 https://dx.doi.org/10.1134/S086959111404002X lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 22 2014 4 07 359-380 |
| allfieldsSound |
10.1134/S086959111404002X doi (DE-627)SPR020203233 (SPR)S086959111404002X-e DE-627 ger DE-627 rakwb eng Borisov, A. A. verfasserin aut Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Pleiades Publishing, Ltd. 2014 Abstract We have experimentally studied the behavior of oxygen isotope composition in silicate melts with a wide range of network-forming cations. Isotopic equilibration of the Di-An eutectic melts modified by addition of Si, Al, Ti, and Fe was carried out in a vertical tube furnace within a temperature range from 1400 to 1570°C. It was established that the value 103Lnα between silicic and basic melts at 1400 and 1450°C systematically increases with increase of $ SiO_{2} $ content, reaching ≈1‰ at 20% melt silica enrichment. The effect of the $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents was studied at 1500°C. An increase in $ Fe_{2} %$ O_{3} $ from 5 to 20 wt % causes a 0.4‰ increase of $ δ^{18} $O. An increase in Ti and Al contents results in the non-linear behavior of $ δ^{18} $O, which decreases in the region of the highest $ TiO_{2} $ (28.4%) and $ Al_{2} %$ O_{3} $ (29.3 %) contents. In the region of moderate $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents, the values of $ δ^{18} $O show monotonous linear dependence on the oxide contents. Methods of estimations of oxygen isotope fractionation coefficients at T > 1400°C in the studied range of network-forming oxides are considered on the basis of experimental data. The calculation of fractionation coefficients with the use of $ I^{18} $O index showed that experimental values with increase of $ SiO_{2} $ content deviate from calculated values by 0.3‰ for basic melts and 0.5–0.6‰ in the region of silicic melts. Similar pattern is observed during approximation of a melt by normative mineral composition. The calculation with the Garlick index leads to the systematic underestimation (on average, by 0.3‰) of $ 10^{3} $Lnα as compared to the experimental data. The NBO/T ratio appeared the best parameter to describe $ 10^{3} $Lnα in the melt-melt system, including the region of high-Fe melts. Analysis of experimental data leads us to conclude that the degree of polymerization of the melts in the studied temperature-composition region is the most important factor affecting the oxygen-isotope fractionation in the melt-melt system. Empirical index similar to the Garlick index was proposed to take into account oxygen associated with T-cations: %$I^m = (C_{Si} + aC_{Al} + bC_{Ti} + cC_{Fe^{3 + } } )/\Sigma C_i ,%$ where a, b, and c constants are empirically established coefficients: 0.75, 0. 70, and 1.75, respectively. Oxygen Isotope (dpeaa)DE-He213 Isotope Fractionation (dpeaa)DE-He213 Isotope Shift (dpeaa)DE-He213 Oxygen Isotope Composition (dpeaa)DE-He213 Tridymite (dpeaa)DE-He213 Dubinina, E. O. aut Enthalten in Petrology Moscow : MAIK Nauka/Interperiodica Publ. [u.a.], 1996 22(2014), 4 vom: Juli, Seite 359-380 (DE-627)511882602 (DE-600)2235750-6 1556-2085 nnns volume:22 year:2014 number:4 month:07 pages:359-380 https://dx.doi.org/10.1134/S086959111404002X lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 22 2014 4 07 359-380 |
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Enthalten in Petrology 22(2014), 4 vom: Juli, Seite 359-380 volume:22 year:2014 number:4 month:07 pages:359-380 |
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A.</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2014</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="500" ind1=" " ind2=" "><subfield code="a">© Pleiades Publishing, Ltd. 2014</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract We have experimentally studied the behavior of oxygen isotope composition in silicate melts with a wide range of network-forming cations. Isotopic equilibration of the Di-An eutectic melts modified by addition of Si, Al, Ti, and Fe was carried out in a vertical tube furnace within a temperature range from 1400 to 1570°C. It was established that the value 103Lnα between silicic and basic melts at 1400 and 1450°C systematically increases with increase of $ SiO_{2} $ content, reaching ≈1‰ at 20% melt silica enrichment. The effect of the $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents was studied at 1500°C. An increase in $ Fe_{2} %$ O_{3} $ from 5 to 20 wt % causes a 0.4‰ increase of $ δ^{18} $O. An increase in Ti and Al contents results in the non-linear behavior of $ δ^{18} $O, which decreases in the region of the highest $ TiO_{2} $ (28.4%) and $ Al_{2} %$ O_{3} $ (29.3 %) contents. In the region of moderate $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents, the values of $ δ^{18} $O show monotonous linear dependence on the oxide contents. Methods of estimations of oxygen isotope fractionation coefficients at T > 1400°C in the studied range of network-forming oxides are considered on the basis of experimental data. The calculation of fractionation coefficients with the use of $ I^{18} $O index showed that experimental values with increase of $ SiO_{2} $ content deviate from calculated values by 0.3‰ for basic melts and 0.5–0.6‰ in the region of silicic melts. Similar pattern is observed during approximation of a melt by normative mineral composition. The calculation with the Garlick index leads to the systematic underestimation (on average, by 0.3‰) of $ 10^{3} $Lnα as compared to the experimental data. The NBO/T ratio appeared the best parameter to describe $ 10^{3} $Lnα in the melt-melt system, including the region of high-Fe melts. Analysis of experimental data leads us to conclude that the degree of polymerization of the melts in the studied temperature-composition region is the most important factor affecting the oxygen-isotope fractionation in the melt-melt system. Empirical index similar to the Garlick index was proposed to take into account oxygen associated with T-cations: %$I^m = (C_{Si} + aC_{Al} + bC_{Ti} + cC_{Fe^{3 + } } )/\Sigma C_i ,%$ where a, b, and c constants are empirically established coefficients: 0.75, 0. 70, and 1.75, respectively.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Oxygen Isotope</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Isotope Fractionation</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Isotope Shift</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Oxygen Isotope Composition</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Tridymite</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Dubinina, E. 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Borisov, A. A. |
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Borisov, A. A. misc Oxygen Isotope misc Isotope Fractionation misc Isotope Shift misc Oxygen Isotope Composition misc Tridymite Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C |
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Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C Oxygen Isotope (dpeaa)DE-He213 Isotope Fractionation (dpeaa)DE-He213 Isotope Shift (dpeaa)DE-He213 Oxygen Isotope Composition (dpeaa)DE-He213 Tridymite (dpeaa)DE-He213 |
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misc Oxygen Isotope misc Isotope Fractionation misc Isotope Shift misc Oxygen Isotope Composition misc Tridymite |
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Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C |
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Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C |
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Borisov, A. A. |
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effect of network-forming cations on the oxygen isotope fractionation between silicate melts: experimental study at 1400–1570°c |
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Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C |
| abstract |
Abstract We have experimentally studied the behavior of oxygen isotope composition in silicate melts with a wide range of network-forming cations. Isotopic equilibration of the Di-An eutectic melts modified by addition of Si, Al, Ti, and Fe was carried out in a vertical tube furnace within a temperature range from 1400 to 1570°C. It was established that the value 103Lnα between silicic and basic melts at 1400 and 1450°C systematically increases with increase of $ SiO_{2} $ content, reaching ≈1‰ at 20% melt silica enrichment. The effect of the $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents was studied at 1500°C. An increase in $ Fe_{2} %$ O_{3} $ from 5 to 20 wt % causes a 0.4‰ increase of $ δ^{18} $O. An increase in Ti and Al contents results in the non-linear behavior of $ δ^{18} $O, which decreases in the region of the highest $ TiO_{2} $ (28.4%) and $ Al_{2} %$ O_{3} $ (29.3 %) contents. In the region of moderate $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents, the values of $ δ^{18} $O show monotonous linear dependence on the oxide contents. Methods of estimations of oxygen isotope fractionation coefficients at T > 1400°C in the studied range of network-forming oxides are considered on the basis of experimental data. The calculation of fractionation coefficients with the use of $ I^{18} $O index showed that experimental values with increase of $ SiO_{2} $ content deviate from calculated values by 0.3‰ for basic melts and 0.5–0.6‰ in the region of silicic melts. Similar pattern is observed during approximation of a melt by normative mineral composition. The calculation with the Garlick index leads to the systematic underestimation (on average, by 0.3‰) of $ 10^{3} $Lnα as compared to the experimental data. The NBO/T ratio appeared the best parameter to describe $ 10^{3} $Lnα in the melt-melt system, including the region of high-Fe melts. Analysis of experimental data leads us to conclude that the degree of polymerization of the melts in the studied temperature-composition region is the most important factor affecting the oxygen-isotope fractionation in the melt-melt system. Empirical index similar to the Garlick index was proposed to take into account oxygen associated with T-cations: %$I^m = (C_{Si} + aC_{Al} + bC_{Ti} + cC_{Fe^{3 + } } )/\Sigma C_i ,%$ where a, b, and c constants are empirically established coefficients: 0.75, 0. 70, and 1.75, respectively. © Pleiades Publishing, Ltd. 2014 |
| abstractGer |
Abstract We have experimentally studied the behavior of oxygen isotope composition in silicate melts with a wide range of network-forming cations. Isotopic equilibration of the Di-An eutectic melts modified by addition of Si, Al, Ti, and Fe was carried out in a vertical tube furnace within a temperature range from 1400 to 1570°C. It was established that the value 103Lnα between silicic and basic melts at 1400 and 1450°C systematically increases with increase of $ SiO_{2} $ content, reaching ≈1‰ at 20% melt silica enrichment. The effect of the $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents was studied at 1500°C. An increase in $ Fe_{2} %$ O_{3} $ from 5 to 20 wt % causes a 0.4‰ increase of $ δ^{18} $O. An increase in Ti and Al contents results in the non-linear behavior of $ δ^{18} $O, which decreases in the region of the highest $ TiO_{2} $ (28.4%) and $ Al_{2} %$ O_{3} $ (29.3 %) contents. In the region of moderate $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents, the values of $ δ^{18} $O show monotonous linear dependence on the oxide contents. Methods of estimations of oxygen isotope fractionation coefficients at T > 1400°C in the studied range of network-forming oxides are considered on the basis of experimental data. The calculation of fractionation coefficients with the use of $ I^{18} $O index showed that experimental values with increase of $ SiO_{2} $ content deviate from calculated values by 0.3‰ for basic melts and 0.5–0.6‰ in the region of silicic melts. Similar pattern is observed during approximation of a melt by normative mineral composition. The calculation with the Garlick index leads to the systematic underestimation (on average, by 0.3‰) of $ 10^{3} $Lnα as compared to the experimental data. The NBO/T ratio appeared the best parameter to describe $ 10^{3} $Lnα in the melt-melt system, including the region of high-Fe melts. Analysis of experimental data leads us to conclude that the degree of polymerization of the melts in the studied temperature-composition region is the most important factor affecting the oxygen-isotope fractionation in the melt-melt system. Empirical index similar to the Garlick index was proposed to take into account oxygen associated with T-cations: %$I^m = (C_{Si} + aC_{Al} + bC_{Ti} + cC_{Fe^{3 + } } )/\Sigma C_i ,%$ where a, b, and c constants are empirically established coefficients: 0.75, 0. 70, and 1.75, respectively. © Pleiades Publishing, Ltd. 2014 |
| abstract_unstemmed |
Abstract We have experimentally studied the behavior of oxygen isotope composition in silicate melts with a wide range of network-forming cations. Isotopic equilibration of the Di-An eutectic melts modified by addition of Si, Al, Ti, and Fe was carried out in a vertical tube furnace within a temperature range from 1400 to 1570°C. It was established that the value 103Lnα between silicic and basic melts at 1400 and 1450°C systematically increases with increase of $ SiO_{2} $ content, reaching ≈1‰ at 20% melt silica enrichment. The effect of the $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents was studied at 1500°C. An increase in $ Fe_{2} %$ O_{3} $ from 5 to 20 wt % causes a 0.4‰ increase of $ δ^{18} $O. An increase in Ti and Al contents results in the non-linear behavior of $ δ^{18} $O, which decreases in the region of the highest $ TiO_{2} $ (28.4%) and $ Al_{2} %$ O_{3} $ (29.3 %) contents. In the region of moderate $ Fe_{2} %$ O_{3} $, $ TiO_{2} $, and $ Al_{2} %$ O_{3} $ contents, the values of $ δ^{18} $O show monotonous linear dependence on the oxide contents. Methods of estimations of oxygen isotope fractionation coefficients at T > 1400°C in the studied range of network-forming oxides are considered on the basis of experimental data. The calculation of fractionation coefficients with the use of $ I^{18} $O index showed that experimental values with increase of $ SiO_{2} $ content deviate from calculated values by 0.3‰ for basic melts and 0.5–0.6‰ in the region of silicic melts. Similar pattern is observed during approximation of a melt by normative mineral composition. The calculation with the Garlick index leads to the systematic underestimation (on average, by 0.3‰) of $ 10^{3} $Lnα as compared to the experimental data. The NBO/T ratio appeared the best parameter to describe $ 10^{3} $Lnα in the melt-melt system, including the region of high-Fe melts. Analysis of experimental data leads us to conclude that the degree of polymerization of the melts in the studied temperature-composition region is the most important factor affecting the oxygen-isotope fractionation in the melt-melt system. Empirical index similar to the Garlick index was proposed to take into account oxygen associated with T-cations: %$I^m = (C_{Si} + aC_{Al} + bC_{Ti} + cC_{Fe^{3 + } } )/\Sigma C_i ,%$ where a, b, and c constants are empirically established coefficients: 0.75, 0. 70, and 1.75, respectively. © Pleiades Publishing, Ltd. 2014 |
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| title_short |
Effect of network-forming cations on the oxygen isotope fractionation between silicate melts: Experimental study at 1400–1570°C |
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https://dx.doi.org/10.1134/S086959111404002X |
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| score |
7.401019 |