The Origin of Hydrous, high-δ18O voluminous volcanism: Diverse Oxygen Isotope Values and High Magmatic Water Contents within the Volcanic Record of Klyuchevskoy Volcano, Kamchatka, Russia
Klyuchevskoy volcano, in Kamchatka’s subduction zone, is one of the most active arc volcanoes in the world and contains some of the highest δ18O values for olivines and basalts. We present an oxygen isotope and melt inclusion study of olivine phenocrysts in conjunction with major and trace element a...
Published in: | Contributions to Mineralogy and Petrology |
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ftoceanrep:oai:oceanrep.geomar.de:7040 2023-05-15T16:59:29+02:00 The Origin of Hydrous, high-δ18O voluminous volcanism: Diverse Oxygen Isotope Values and High Magmatic Water Contents within the Volcanic Record of Klyuchevskoy Volcano, Kamchatka, Russia Auer, S. L. Bindeman, I. Wallace, P. Ponomareva, V. V. Portnyagin, Maxim 2009 text https://oceanrep.geomar.de/id/eprint/7040/ https://oceanrep.geomar.de/id/eprint/7040/1/462_Auer_2009_TheOriginOfHydrousHigh%CE%B418o_Artzeit_pubid11237.pdf https://doi.org/10.1007/s00410-008-0330-0 en eng Springer https://oceanrep.geomar.de/id/eprint/7040/1/462_Auer_2009_TheOriginOfHydrousHigh%CE%B418o_Artzeit_pubid11237.pdf Auer, S. L., Bindeman, I., Wallace, P., Ponomareva, V. V. and Portnyagin, M. (2009) The Origin of Hydrous, high-δ18O voluminous volcanism: Diverse Oxygen Isotope Values and High Magmatic Water Contents within the Volcanic Record of Klyuchevskoy Volcano, Kamchatka, Russia. Contributions to Mineralogy and Petrology, 157 . pp. 209-230. DOI 10.1007/s00410-008-0330-0 <https://doi.org/10.1007/s00410-008-0330-0>. doi:10.1007/s00410-008-0330-0 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2009 ftoceanrep https://doi.org/10.1007/s00410-008-0330-0 2023-04-07T14:53:57Z Klyuchevskoy volcano, in Kamchatka’s subduction zone, is one of the most active arc volcanoes in the world and contains some of the highest δ18O values for olivines and basalts. We present an oxygen isotope and melt inclusion study of olivine phenocrysts in conjunction with major and trace element analyses of 14C- and tephrochronologically-dated tephra layers and lavas spanning the eruptive history of Klyuchevskoy. Whole-rock and groundmass analyses of tephra layers and lava samples demonstrate that both high-Mg (7–12.5 wt% MgO) and high-Al (17–19 wt% Al2O3, 3–6.5 wt% MgO) basalt and basaltic andesite erupted coevally from the central vent and flank cones. Individual and bulk olivine δ18O range from normal MORB values of 5.1‰ to values as high as 7.6‰. Likewise, tephra and lava matrix glass have high-δ18O values of 5.8–8.1‰. High-Al basalts dominate volumetrically in Klyuchevskoy’s volcanic record and are mostly high in δ18O. High-δ18O olivines and more normal-δ18O olivines occur in both high-Mg and high-Al samples. Most olivines in either high-Al or high-Mg basalts are not in oxygen isotopic equilibrium with their host glasses, and Δ18Oolivine–glass values are out of equilibrium by up to 1.5‰. Olivines are also out of Fe–Mg equilibrium with the host glasses, but to a lesser extent. Water concentrations in olivine-hosted melt inclusions from five tephra samples range from 0.4 to 7.1 wt%. Melt inclusion CO2 concentrations vary from below detection (<50 ppm) to 1,900 ppm. These values indicate depths of crystallization up to ~17 km (5 kbar). The variable H2O and CO2 concentrations likely reflect crystallization of olivine and entrapment of inclusions in ascending and degassing magma. Oxygen isotope and Fe–Mg disequilibria together with melt inclusion data indicate that olivine was mixed and recycled between high-Al and high-Mg basaltic melts and cumulates, and Fe–Mg and δ18O re-equilibration processes were incomplete. Major and trace elements in the variably high-δ18O olivines suggest a peridotite source for ... Article in Journal/Newspaper Kamchatka OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Contributions to Mineralogy and Petrology 157 2 209 230 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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English |
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Klyuchevskoy volcano, in Kamchatka’s subduction zone, is one of the most active arc volcanoes in the world and contains some of the highest δ18O values for olivines and basalts. We present an oxygen isotope and melt inclusion study of olivine phenocrysts in conjunction with major and trace element analyses of 14C- and tephrochronologically-dated tephra layers and lavas spanning the eruptive history of Klyuchevskoy. Whole-rock and groundmass analyses of tephra layers and lava samples demonstrate that both high-Mg (7–12.5 wt% MgO) and high-Al (17–19 wt% Al2O3, 3–6.5 wt% MgO) basalt and basaltic andesite erupted coevally from the central vent and flank cones. Individual and bulk olivine δ18O range from normal MORB values of 5.1‰ to values as high as 7.6‰. Likewise, tephra and lava matrix glass have high-δ18O values of 5.8–8.1‰. High-Al basalts dominate volumetrically in Klyuchevskoy’s volcanic record and are mostly high in δ18O. High-δ18O olivines and more normal-δ18O olivines occur in both high-Mg and high-Al samples. Most olivines in either high-Al or high-Mg basalts are not in oxygen isotopic equilibrium with their host glasses, and Δ18Oolivine–glass values are out of equilibrium by up to 1.5‰. Olivines are also out of Fe–Mg equilibrium with the host glasses, but to a lesser extent. Water concentrations in olivine-hosted melt inclusions from five tephra samples range from 0.4 to 7.1 wt%. Melt inclusion CO2 concentrations vary from below detection (<50 ppm) to 1,900 ppm. These values indicate depths of crystallization up to ~17 km (5 kbar). The variable H2O and CO2 concentrations likely reflect crystallization of olivine and entrapment of inclusions in ascending and degassing magma. Oxygen isotope and Fe–Mg disequilibria together with melt inclusion data indicate that olivine was mixed and recycled between high-Al and high-Mg basaltic melts and cumulates, and Fe–Mg and δ18O re-equilibration processes were incomplete. Major and trace elements in the variably high-δ18O olivines suggest a peridotite source for ... |
format |
Article in Journal/Newspaper |
author |
Auer, S. L. Bindeman, I. Wallace, P. Ponomareva, V. V. Portnyagin, Maxim |
spellingShingle |
Auer, S. L. Bindeman, I. Wallace, P. Ponomareva, V. V. Portnyagin, Maxim The Origin of Hydrous, high-δ18O voluminous volcanism: Diverse Oxygen Isotope Values and High Magmatic Water Contents within the Volcanic Record of Klyuchevskoy Volcano, Kamchatka, Russia |
author_facet |
Auer, S. L. Bindeman, I. Wallace, P. Ponomareva, V. V. Portnyagin, Maxim |
author_sort |
Auer, S. L. |
title |
The Origin of Hydrous, high-δ18O voluminous volcanism: Diverse Oxygen Isotope Values and High Magmatic Water Contents within the Volcanic Record of Klyuchevskoy Volcano, Kamchatka, Russia |
title_short |
The Origin of Hydrous, high-δ18O voluminous volcanism: Diverse Oxygen Isotope Values and High Magmatic Water Contents within the Volcanic Record of Klyuchevskoy Volcano, Kamchatka, Russia |
title_full |
The Origin of Hydrous, high-δ18O voluminous volcanism: Diverse Oxygen Isotope Values and High Magmatic Water Contents within the Volcanic Record of Klyuchevskoy Volcano, Kamchatka, Russia |
title_fullStr |
The Origin of Hydrous, high-δ18O voluminous volcanism: Diverse Oxygen Isotope Values and High Magmatic Water Contents within the Volcanic Record of Klyuchevskoy Volcano, Kamchatka, Russia |
title_full_unstemmed |
The Origin of Hydrous, high-δ18O voluminous volcanism: Diverse Oxygen Isotope Values and High Magmatic Water Contents within the Volcanic Record of Klyuchevskoy Volcano, Kamchatka, Russia |
title_sort |
origin of hydrous, high-δ18o voluminous volcanism: diverse oxygen isotope values and high magmatic water contents within the volcanic record of klyuchevskoy volcano, kamchatka, russia |
publisher |
Springer |
publishDate |
2009 |
url |
https://oceanrep.geomar.de/id/eprint/7040/ https://oceanrep.geomar.de/id/eprint/7040/1/462_Auer_2009_TheOriginOfHydrousHigh%CE%B418o_Artzeit_pubid11237.pdf https://doi.org/10.1007/s00410-008-0330-0 |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
https://oceanrep.geomar.de/id/eprint/7040/1/462_Auer_2009_TheOriginOfHydrousHigh%CE%B418o_Artzeit_pubid11237.pdf Auer, S. L., Bindeman, I., Wallace, P., Ponomareva, V. V. and Portnyagin, M. (2009) The Origin of Hydrous, high-δ18O voluminous volcanism: Diverse Oxygen Isotope Values and High Magmatic Water Contents within the Volcanic Record of Klyuchevskoy Volcano, Kamchatka, Russia. Contributions to Mineralogy and Petrology, 157 . pp. 209-230. DOI 10.1007/s00410-008-0330-0 <https://doi.org/10.1007/s00410-008-0330-0>. doi:10.1007/s00410-008-0330-0 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s00410-008-0330-0 |
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Contributions to Mineralogy and Petrology |
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157 |
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2 |
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209 |
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