Details
| Original language | English |
|---|---|
| Pages (from-to) | 369-383 |
| Number of pages | 15 |
| Journal | American Mineralogist |
| Volume | 103 |
| Issue number | 3 |
| Early online date | 2 Mar 2018 |
| Publication status | Published - 26 Mar 2018 |
Abstract
The strong dependence of vanadium partitioning between olivine and silicate melt (DVO1-M) on redox conditions (fO2) can be used as sensitive oxybarometer in magmatic systems. Here we extend the experimental database on DVO1-M, obtained so far at high temperatures (mainly above 1250 °C), to lower temperatures that are typical for island-arc basalts. Crystallization experiments were performed using a composition from Mutnovsky volcano (Kamchatka), and the investigated temperature, pressure, and oxygen fugacity ranges were 1025-1150 °C, 0.1 and 0.3 GPa, and ΔQFM of -0.5 to +3.2, respectively. The water content in melts ranged from 0.6 to ∼6.5 wt% H2O. The data demonstrate a strong negative correlation between DVO1-M and oxygen fugacity, similar to the behavior observed previously at higher temperatures and in MgO-rich compositions. The correlation between DVO1-M and ΔQFM in the range from -0.5 to +3.2 is described for melts with MgO < 12 wt% and Na2O < 4 wt% at temperatures ≤1250 °C by the empirical equation: ΔQFM = -3.07-0.29+0.26log DVO1-M-3.34-0.49+0.40 with the standard error (SE) as a function of logDVO1-M: 2SE(ΔQFM) = -0.275log DVO1-M + 0.4. We suggest that this equation can be used as an oxybarometer, which is particularly well applicable to the hydrous island-arc magmas at relatively low temperature. Application of the equation to the composition of melt inclusions and their host olivine phenocrysts from basalts of Mutnovsky volcano, containing vanadium concentrations in the range of 250-370 and 4-6 ppm, respectively, reveals an oxygen fugacity in the range ΔQFM +1.9 to +2.3. The estimates are in a good agreement with olivine-spinel oxybarometry for Mutnovsky basalts and may be typical for moderately evolved island-arc magmas.
Keywords
- island arcs, melt inclusions, New Advances in Subduction Zone Magma Genesis, oxybarometry, redox conditions, Vanadium
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: American Mineralogist, Vol. 103, No. 3, 26.03.2018, p. 369-383.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Experimental calibration and implications of olivine-melt vanadium oxybarometry for hydrous basaltic arc magmas
AU - Shishkina, Tatiana A.
AU - Portnyagin, Maxim V.
AU - Botcharnikov, Roman E.
AU - Almeev, Renat R.
AU - Simonyan, Anna V.
AU - Garbe-Schönberg, DIeter
AU - Schuth, Stephan
AU - Oeser, Martin
AU - Holtz, Francois
N1 - Funding Information: This research has been supported by the Russian Foundation for Basic Research (project no. 16-35-60123), the Russian Science Foundation (grant 14-17-000582) and the German Science Foundation (DFG projects Ho1337/21, Ho1337/19, and Bo2941/3-1). We thank C. Godeck for the help with performing the experiments, U. Westernströer for help with the LA-ICP-MS at CAU Kiel, I. Horn for help with the LA-ICP-MS at LU Hannover. Also we thank M. Brounce and an anonymous reviewer whose critical comments helped to improve the original manuscript. The editorial work of S. Straub is greatly appreciated.
PY - 2018/3/26
Y1 - 2018/3/26
N2 - The strong dependence of vanadium partitioning between olivine and silicate melt (DVO1-M) on redox conditions (fO2) can be used as sensitive oxybarometer in magmatic systems. Here we extend the experimental database on DVO1-M, obtained so far at high temperatures (mainly above 1250 °C), to lower temperatures that are typical for island-arc basalts. Crystallization experiments were performed using a composition from Mutnovsky volcano (Kamchatka), and the investigated temperature, pressure, and oxygen fugacity ranges were 1025-1150 °C, 0.1 and 0.3 GPa, and ΔQFM of -0.5 to +3.2, respectively. The water content in melts ranged from 0.6 to ∼6.5 wt% H2O. The data demonstrate a strong negative correlation between DVO1-M and oxygen fugacity, similar to the behavior observed previously at higher temperatures and in MgO-rich compositions. The correlation between DVO1-M and ΔQFM in the range from -0.5 to +3.2 is described for melts with MgO < 12 wt% and Na2O < 4 wt% at temperatures ≤1250 °C by the empirical equation: ΔQFM = -3.07-0.29+0.26log DVO1-M-3.34-0.49+0.40 with the standard error (SE) as a function of logDVO1-M: 2SE(ΔQFM) = -0.275log DVO1-M + 0.4. We suggest that this equation can be used as an oxybarometer, which is particularly well applicable to the hydrous island-arc magmas at relatively low temperature. Application of the equation to the composition of melt inclusions and their host olivine phenocrysts from basalts of Mutnovsky volcano, containing vanadium concentrations in the range of 250-370 and 4-6 ppm, respectively, reveals an oxygen fugacity in the range ΔQFM +1.9 to +2.3. The estimates are in a good agreement with olivine-spinel oxybarometry for Mutnovsky basalts and may be typical for moderately evolved island-arc magmas.
AB - The strong dependence of vanadium partitioning between olivine and silicate melt (DVO1-M) on redox conditions (fO2) can be used as sensitive oxybarometer in magmatic systems. Here we extend the experimental database on DVO1-M, obtained so far at high temperatures (mainly above 1250 °C), to lower temperatures that are typical for island-arc basalts. Crystallization experiments were performed using a composition from Mutnovsky volcano (Kamchatka), and the investigated temperature, pressure, and oxygen fugacity ranges were 1025-1150 °C, 0.1 and 0.3 GPa, and ΔQFM of -0.5 to +3.2, respectively. The water content in melts ranged from 0.6 to ∼6.5 wt% H2O. The data demonstrate a strong negative correlation between DVO1-M and oxygen fugacity, similar to the behavior observed previously at higher temperatures and in MgO-rich compositions. The correlation between DVO1-M and ΔQFM in the range from -0.5 to +3.2 is described for melts with MgO < 12 wt% and Na2O < 4 wt% at temperatures ≤1250 °C by the empirical equation: ΔQFM = -3.07-0.29+0.26log DVO1-M-3.34-0.49+0.40 with the standard error (SE) as a function of logDVO1-M: 2SE(ΔQFM) = -0.275log DVO1-M + 0.4. We suggest that this equation can be used as an oxybarometer, which is particularly well applicable to the hydrous island-arc magmas at relatively low temperature. Application of the equation to the composition of melt inclusions and their host olivine phenocrysts from basalts of Mutnovsky volcano, containing vanadium concentrations in the range of 250-370 and 4-6 ppm, respectively, reveals an oxygen fugacity in the range ΔQFM +1.9 to +2.3. The estimates are in a good agreement with olivine-spinel oxybarometry for Mutnovsky basalts and may be typical for moderately evolved island-arc magmas.
KW - island arcs
KW - melt inclusions
KW - New Advances in Subduction Zone Magma Genesis
KW - oxybarometry
KW - redox conditions
KW - Vanadium
UR - http://www.scopus.com/inward/record.url?scp=85043257556&partnerID=8YFLogxK
U2 - 10.2138/am-2018-6210
DO - 10.2138/am-2018-6210
M3 - Article
AN - SCOPUS:85043257556
VL - 103
SP - 369
EP - 383
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 3
ER -