Magma storage, ascent and recharge history prior to the 1991 eruption at Avachinsky Volcano, Kamchatka, Russia: Inferences on the plumbing system geometry
Textural and compositional features of plagioclase phenocrysts of the 1991 eruption lavas at Avachinsky Volcano (Kamchatka, Russia) were used to investigate the feeding system processes. Volcanics are porphyritic basaltic andesites and andesites with low-K affinity. A fractionation modeling for both...
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ftinstvs:oai:repo.kscnet.ru:2551 2023-05-15T16:59:03+02:00 Magma storage, ascent and recharge history prior to the 1991 eruption at Avachinsky Volcano, Kamchatka, Russia: Inferences on the plumbing system geometry Viccaro Marco Giuffrida Marisa Nicotra Eugenio Ozerov Alexey Yu. 2012 text http://repo.kscnet.ru/2551/ http://repo.kscnet.ru/2551/1/2012_Viccaro-Avacha.pdf http://www.sciencedirect.com/science/article/pii/S0024493712000357 en eng http://repo.kscnet.ru/2551/1/2012_Viccaro-Avacha.pdf Viccaro Marco <http://repo.kscnet.ru/view/creators/Viccaro=3AMarco=3A=3A.html>, Giuffrida Marisa <http://repo.kscnet.ru/view/creators/Giuffrida=3AMarisa=3A=3A.html>, Nicotra Eugenio <http://repo.kscnet.ru/view/creators/Nicotra=3AEugenio=3A=3A.html>, Ozerov Alexey Yu. <http://repo.kscnet.ru/view/creators/Ozerov=3AAlexey_Yu=2E=3A=3A.html> (2012) Magma storage, ascent and recharge history prior to the 1991 eruption at Avachinsky Volcano, Kamchatka, Russia: Inferences on the plumbing system geometry // Lithos. Vol. 140–14, pp. 11 - 24. doi:10.1016/j.lithos.2012.01.019 <http://doi.org/10.1016/j.lithos.2012.01.019>. 38.37.25 Вулканология Авачинский Статья PeerReviewed 2012 ftinstvs https://doi.org/10.1016/j.lithos.2012.01.019 2022-08-09T17:05:34Z Textural and compositional features of plagioclase phenocrysts of the 1991 eruption lavas at Avachinsky Volcano (Kamchatka, Russia) were used to investigate the feeding system processes. Volcanics are porphyritic basaltic andesites and andesites with low-K affinity. A fractionation modeling for both major and trace elements was performed to justify the development of these evolved compositions. The occurrence of other magma chamber processes was verified through high-contrast BSE images and core-to-rim compositional profiles (An and FeO wt.) on plagioclase crystals. Textural types include small and large-scale oscillation patterns, disequilibrium textures at the crystal core (patchy zoning, coarse sieve-textures, dissolved cores), disequilibrium textures at the crystal rim (sieve-textures), melt inclusion alignments at the rim. Disequilibrium textures at the cores may testify episodes of destabilization at various decompression rates under water-undersaturated conditions, which suggests different pathways of magma ascent at depth. At shallower, water-saturated conditions, plagioclase crystallization continues in a system not affected by important chemical-physical perturbations (oscillatory zoning develops). Strongly sieve-textured rims, along with An increase at rather constant FeO, are evidence of mixing before the 1991 eruption between a residing magma and a hotter and volatile-richer one. The textural evidence implies that crystals underwent common histories at shallow levels, supporting the existence of a large magma reservoir whose top is at ~ 5.5 km of depth. Distinct textures at the outer rims in a hand-size sample are evidence that crystals mix mechanically at very shallow levels, probably in a small reservoir at ~ 1.8 km of depth. Text Kamchatka Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository Lithos 140-141 11 24 |
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Open Polar |
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Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository |
op_collection_id |
ftinstvs |
language |
English |
topic |
38.37.25 Вулканология Авачинский |
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38.37.25 Вулканология Авачинский Viccaro Marco Giuffrida Marisa Nicotra Eugenio Ozerov Alexey Yu. Magma storage, ascent and recharge history prior to the 1991 eruption at Avachinsky Volcano, Kamchatka, Russia: Inferences on the plumbing system geometry |
topic_facet |
38.37.25 Вулканология Авачинский |
description |
Textural and compositional features of plagioclase phenocrysts of the 1991 eruption lavas at Avachinsky Volcano (Kamchatka, Russia) were used to investigate the feeding system processes. Volcanics are porphyritic basaltic andesites and andesites with low-K affinity. A fractionation modeling for both major and trace elements was performed to justify the development of these evolved compositions. The occurrence of other magma chamber processes was verified through high-contrast BSE images and core-to-rim compositional profiles (An and FeO wt.) on plagioclase crystals. Textural types include small and large-scale oscillation patterns, disequilibrium textures at the crystal core (patchy zoning, coarse sieve-textures, dissolved cores), disequilibrium textures at the crystal rim (sieve-textures), melt inclusion alignments at the rim. Disequilibrium textures at the cores may testify episodes of destabilization at various decompression rates under water-undersaturated conditions, which suggests different pathways of magma ascent at depth. At shallower, water-saturated conditions, plagioclase crystallization continues in a system not affected by important chemical-physical perturbations (oscillatory zoning develops). Strongly sieve-textured rims, along with An increase at rather constant FeO, are evidence of mixing before the 1991 eruption between a residing magma and a hotter and volatile-richer one. The textural evidence implies that crystals underwent common histories at shallow levels, supporting the existence of a large magma reservoir whose top is at ~ 5.5 km of depth. Distinct textures at the outer rims in a hand-size sample are evidence that crystals mix mechanically at very shallow levels, probably in a small reservoir at ~ 1.8 km of depth. |
format |
Text |
author |
Viccaro Marco Giuffrida Marisa Nicotra Eugenio Ozerov Alexey Yu. |
author_facet |
Viccaro Marco Giuffrida Marisa Nicotra Eugenio Ozerov Alexey Yu. |
author_sort |
Viccaro Marco |
title |
Magma storage, ascent and recharge history prior to the 1991 eruption at Avachinsky Volcano, Kamchatka, Russia: Inferences on the plumbing system geometry |
title_short |
Magma storage, ascent and recharge history prior to the 1991 eruption at Avachinsky Volcano, Kamchatka, Russia: Inferences on the plumbing system geometry |
title_full |
Magma storage, ascent and recharge history prior to the 1991 eruption at Avachinsky Volcano, Kamchatka, Russia: Inferences on the plumbing system geometry |
title_fullStr |
Magma storage, ascent and recharge history prior to the 1991 eruption at Avachinsky Volcano, Kamchatka, Russia: Inferences on the plumbing system geometry |
title_full_unstemmed |
Magma storage, ascent and recharge history prior to the 1991 eruption at Avachinsky Volcano, Kamchatka, Russia: Inferences on the plumbing system geometry |
title_sort |
magma storage, ascent and recharge history prior to the 1991 eruption at avachinsky volcano, kamchatka, russia: inferences on the plumbing system geometry |
publishDate |
2012 |
url |
http://repo.kscnet.ru/2551/ http://repo.kscnet.ru/2551/1/2012_Viccaro-Avacha.pdf http://www.sciencedirect.com/science/article/pii/S0024493712000357 |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
http://repo.kscnet.ru/2551/1/2012_Viccaro-Avacha.pdf Viccaro Marco <http://repo.kscnet.ru/view/creators/Viccaro=3AMarco=3A=3A.html>, Giuffrida Marisa <http://repo.kscnet.ru/view/creators/Giuffrida=3AMarisa=3A=3A.html>, Nicotra Eugenio <http://repo.kscnet.ru/view/creators/Nicotra=3AEugenio=3A=3A.html>, Ozerov Alexey Yu. <http://repo.kscnet.ru/view/creators/Ozerov=3AAlexey_Yu=2E=3A=3A.html> (2012) Magma storage, ascent and recharge history prior to the 1991 eruption at Avachinsky Volcano, Kamchatka, Russia: Inferences on the plumbing system geometry // Lithos. Vol. 140–14, pp. 11 - 24. doi:10.1016/j.lithos.2012.01.019 <http://doi.org/10.1016/j.lithos.2012.01.019>. |
op_doi |
https://doi.org/10.1016/j.lithos.2012.01.019 |
container_title |
Lithos |
container_volume |
140-141 |
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11 |
op_container_end_page |
24 |
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1766051217637638144 |