Monitoring of the volcanic rock compositions during the 2012-2013 fissure eruption at Tolbachik volcano, Kamchatka
Here we present the results from monitoring of the composition of rocks produced during the 2012-2013 fissure eruption at Tolbachik volcano (FTE). Major and trace element concentrations in 75 samples are reported. Products of this eruption are represented by high alumina basaltic trachyandesites wit...
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ftsubgoettingen:oai:publications.goettingen-research-online.de:2/35234 2023-07-30T04:04:35+02:00 Monitoring of the volcanic rock compositions during the 2012-2013 fissure eruption at Tolbachik volcano, Kamchatka Volynets, Anna O. Edwards, Benjamin R. Melnikov, Dmitry Yakushev, Anton Griboedova, Irina 2015 https://resolver.sub.uni-goettingen.de/purl?gro-2/35234 https://doi.org/10.1016/j.jvolgeores.2015.07.014 unknown Elsevier Science Bv 1872-6097 0377-0273 https://resolver.sub.uni-goettingen.de/purl?gro-2/35234 doi:10.1016/j.jvolgeores.2015.07.014 000367492900012 journal_article published yes 2015 ftsubgoettingen https://doi.org/10.1016/j.jvolgeores.2015.07.014 2023-07-16T22:13:02Z Here we present the results from monitoring of the composition of rocks produced during the 2012-2013 fissure eruption at Tolbachik volcano (FTE). Major and trace element concentrations in 75 samples are reported. Products of this eruption are represented by high alumina basaltic trachyandesites with higher alkalis and titanium contents than in all previously studied rocks of the Tolbachik monogenetic volcanic field. Rocks erupted during the first three days (27-30 November) from the northern (also called Menyailov) group of vents are the most silica- and alkali-rich (SiO2 concentrations up to 55.35 wt.% and K2O up to 2.67 wt.%). From December onwards, when the eruptive activity switched from the Menyailov vents to the southern (Naboko) group of vents, silica content dropped by 2 wt.%, concentrations of MgO, FeO, TiO2 and Mg# increased, and K2O and Na2O concentrations and K2O/MgO ratio decreased. For the rest of the eruption the compositions of rocks remained constant and homogeneous; no systematic compositional differences between lava, bombs and scoria samples are evident. Trace element distributions in the rocks of the Menyailov and Naboko vent lavas are relatively uniform; Menyailov lavas have slightly higher Th, Nb, Hf, Y, and HREE concentrations than the Naboko vent lavas at more or less constant element ratios. We explain the initial change in geochemistry by tapping of a slightly cooler and fractionated (similar to 3% Mt and 8% Cpx) upper part of the magma storage zone before the main storage area began to feed the eruption. Thermodynamic constraints show that apparent liquidus temperatures varied from 1142 degrees C to 1151 degrees C, and thermodynamic modeling shows that variations in compositions are consistent with a high degree of low pressure (100-300 MPa), nominally anhydrous fractionation of a parent melt compositionally similar to the 1975 Northern Breakthrough high-Mg basalt. Geochemistry, petrological observations and modeling are in agreement with the newly erupted material being derived from ... Article in Journal/Newspaper Kamchatka Georg-August-Universität Göttingen: GoeScholar Tolbachik ENVELOPE(159.960,159.960,55.537,55.537) Journal of Volcanology and Geothermal Research 307 120 132 |
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Georg-August-Universität Göttingen: GoeScholar |
op_collection_id |
ftsubgoettingen |
language |
unknown |
description |
Here we present the results from monitoring of the composition of rocks produced during the 2012-2013 fissure eruption at Tolbachik volcano (FTE). Major and trace element concentrations in 75 samples are reported. Products of this eruption are represented by high alumina basaltic trachyandesites with higher alkalis and titanium contents than in all previously studied rocks of the Tolbachik monogenetic volcanic field. Rocks erupted during the first three days (27-30 November) from the northern (also called Menyailov) group of vents are the most silica- and alkali-rich (SiO2 concentrations up to 55.35 wt.% and K2O up to 2.67 wt.%). From December onwards, when the eruptive activity switched from the Menyailov vents to the southern (Naboko) group of vents, silica content dropped by 2 wt.%, concentrations of MgO, FeO, TiO2 and Mg# increased, and K2O and Na2O concentrations and K2O/MgO ratio decreased. For the rest of the eruption the compositions of rocks remained constant and homogeneous; no systematic compositional differences between lava, bombs and scoria samples are evident. Trace element distributions in the rocks of the Menyailov and Naboko vent lavas are relatively uniform; Menyailov lavas have slightly higher Th, Nb, Hf, Y, and HREE concentrations than the Naboko vent lavas at more or less constant element ratios. We explain the initial change in geochemistry by tapping of a slightly cooler and fractionated (similar to 3% Mt and 8% Cpx) upper part of the magma storage zone before the main storage area began to feed the eruption. Thermodynamic constraints show that apparent liquidus temperatures varied from 1142 degrees C to 1151 degrees C, and thermodynamic modeling shows that variations in compositions are consistent with a high degree of low pressure (100-300 MPa), nominally anhydrous fractionation of a parent melt compositionally similar to the 1975 Northern Breakthrough high-Mg basalt. Geochemistry, petrological observations and modeling are in agreement with the newly erupted material being derived from ... |
format |
Article in Journal/Newspaper |
author |
Volynets, Anna O. Edwards, Benjamin R. Melnikov, Dmitry Yakushev, Anton Griboedova, Irina |
spellingShingle |
Volynets, Anna O. Edwards, Benjamin R. Melnikov, Dmitry Yakushev, Anton Griboedova, Irina Monitoring of the volcanic rock compositions during the 2012-2013 fissure eruption at Tolbachik volcano, Kamchatka |
author_facet |
Volynets, Anna O. Edwards, Benjamin R. Melnikov, Dmitry Yakushev, Anton Griboedova, Irina |
author_sort |
Volynets, Anna O. |
title |
Monitoring of the volcanic rock compositions during the 2012-2013 fissure eruption at Tolbachik volcano, Kamchatka |
title_short |
Monitoring of the volcanic rock compositions during the 2012-2013 fissure eruption at Tolbachik volcano, Kamchatka |
title_full |
Monitoring of the volcanic rock compositions during the 2012-2013 fissure eruption at Tolbachik volcano, Kamchatka |
title_fullStr |
Monitoring of the volcanic rock compositions during the 2012-2013 fissure eruption at Tolbachik volcano, Kamchatka |
title_full_unstemmed |
Monitoring of the volcanic rock compositions during the 2012-2013 fissure eruption at Tolbachik volcano, Kamchatka |
title_sort |
monitoring of the volcanic rock compositions during the 2012-2013 fissure eruption at tolbachik volcano, kamchatka |
publisher |
Elsevier Science Bv |
publishDate |
2015 |
url |
https://resolver.sub.uni-goettingen.de/purl?gro-2/35234 https://doi.org/10.1016/j.jvolgeores.2015.07.014 |
long_lat |
ENVELOPE(159.960,159.960,55.537,55.537) |
geographic |
Tolbachik |
geographic_facet |
Tolbachik |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
1872-6097 0377-0273 https://resolver.sub.uni-goettingen.de/purl?gro-2/35234 doi:10.1016/j.jvolgeores.2015.07.014 000367492900012 |
op_doi |
https://doi.org/10.1016/j.jvolgeores.2015.07.014 |
container_title |
Journal of Volcanology and Geothermal Research |
container_volume |
307 |
container_start_page |
120 |
op_container_end_page |
132 |
_version_ |
1772816128650772480 |