Petrology and volatile content of magmas erupted from Tolbachik Volcano, Kamchatka, 2012–13

Plechov, P. Yu.; Blundy, Jon; Nekrylov, Nikolai; Melekhova, Elena; Щербаков, В. П.; Tikhonova, Margarita S.

doi:10.1016/j.jvolgeores.2015.08.011

Cited by 45 publications

(31 citation statements)

References 32 publications

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“…It is likely that the two batches with different ascent and storage histories mixed together shortly before or during eruption. Mixing of magmas with similar chemistry but different textures has been described previously from the 2012-13 eruption of Tolbachik, Kamchatka (Plechov et al 2015). We prefer this explanation rather than one involving clast recycling at the vent because of the differences in modal mineralogy of the samples, the presence of inclusions that are more evolved than groundmass, and the absence of apatite in Batch 1.…”

Section: Isothermal Degassing Vs Isobaric Crystallisationmentioning

confidence: 64%

The 2011 eruption of Nabro volcano, Eritrea: perspectives on magmatic processes from melt inclusions

Donovan

Blundy

Oppenheimer

et al. 2017

Contrib Mineral Petrol

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The 2011 eruption of Nabro volcano, Eritrea, produced one of the largest volcanic sulphur inputs to the atmosphere since the 1991 eruption of Mt. Pinatubo, yet has received comparatively little scientific attention. Nabro forms part of an off-axis alignment, broadly perpendicular to the Afar Rift, and has a history of large-magnitude explosive silicic eruptions, as well as smaller more mafic ones. Here, we present and analyse extensive petrological data obtained from samples of trachybasaltic tephra erupted during the 2011 eruption to assess the pre-eruptive magma storage system and explain the large sulphur emission. We show that the eruption involved two texturally distinct batches of magma, one of which was more primitive and richer in sulphur than the other, which was higher in water (up to 2.5 wt%). Modelling of the degassing and crystallisation histories demonstrates that the more primitive magma rose rapidly from depth and experienced degassing crystallisation, while the other experienced isobaric cooling in the crust at around 5 km depth. Interaction between the two batches occurred shortly before the eruption. The eruption itself was likely triggered by recharge-induced destabilisation of vertically extensive mush zone under the volcano. This could potentially account for the large volume of sulphur released. Some of the melt inclusions are volatile undersaturated, and suggest that the original water content of the magma was around 1.3 wt%, which is relatively high for an intraplate setting, but consistent with seismic studies of the Afar plume. This eruption was smaller than some geological eruptions at Nabro, but provides important insights into the plumbing systems and dynamics of off-axis volcanoes in Afar.

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Section: Isothermal Degassing Vs Isobaric Crystallisationmentioning

confidence: 64%

The 2011 eruption of Nabro volcano, Eritrea: perspectives on magmatic processes from melt inclusions

Donovan

Blundy

Oppenheimer

et al. 2017

Contrib Mineral Petrol

Self Cite

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“…Ломоносова с использованием конфокального рамановского микроскопа JY Horiba XPloRA Jobin на базе поляризационого микроскопа Olympus BX41 и оснащенного двумя лазерами (532 и 785 нм). Методика измерения описана в статье (Plechov et al, 2015). Обработка спектров проводилась в программе LabSpec Ver.…”

Section: рамановская спектроскопияunclassified

Compositions and formation conditions of primitive magmas of the Karymsky volcanic center, Kamchatka: evidence from melt inclusions and trace-element thermobarometry

Tobelko¹,

Portnyagin²,

Krasheninnikov³

et al. 2019

Петрология

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This paper reports the results of a study of naturally and experimentally quenched melt inclusions in magnesian olivine (Fo77–89) from a basalt sample from the Karymsky volcanic center, which is located in the middle segment of the Eastern Volcanic Front of Kamchatka. The conditions of parental magma formation were estimated using modern methods of trace-element thermometry. Based on direct H2O measurements in inclusions and thermometry of coexisting olivine and spinel, it was shown that the parent melts contained at least 4.5 wt % H2O and crystallized at a temperature of 1114 ± 27°C and an oxygen fugacity of DQFM = 1.5 ± 0.4. The obtained estimates of H2O content and crystallization temperature are among the first and currently most reliable data for the Eastern Volcanic Front of Kamchatka. The primary melt of the Karymsky volcanic center was derived from peridotitic material and could be produced by ~12–17% melting of an enriched MORB source (E-DMM) at ~1230–1250°C and ~1.5 GPa. Our estimates of mantle melting temperature beneath Kamchatka are slightly lower than values reported previously and up to 50°C lower than the dry peridotite solidus, which indicates the influence of a slab-derived hydrous melt. The combined approach to the estimation of the initial H2O content of melt employed in this study can provide a more reliable data in future investigations, and its application will probably to decrease the existing temperature estimates for the mantle wedge above subduction zones.

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“…3). Оценка концентраций воды в стекле, выполненная для 7 включений по методике, опубликованной в работах [8,9], дала значения концентраций воды в стёклах в интервале 4,8-7,7 мас.% (среднее значение 6,4 мас.%).…”

Section: геохимияunclassified

Low-temperature acidic melts of Bazman volcano (Iran)

Prokofiev

Наумов

Romanko

et al. 2019

Доклады Академии наук

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The inclusions of a silicate melt were investigated in quartz insets of the extrusive rhyolite collected at Bazman Cenozoic volcano (Iran) and associated with the process of recent subduction. Low temperatures of the silicate melt along with high concentrations of water in the melt are ascertained. The microelemental composition of the melt showed a similarity to acidic melts of island-arc formations.

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Petrology and volatile content of magmas erupted from Tolbachik Volcano, Kamchatka, 2012–13

Cited by 45 publications

References 32 publications

The 2011 eruption of Nabro volcano, Eritrea: perspectives on magmatic processes from melt inclusions

The 2011 eruption of Nabro volcano, Eritrea: perspectives on magmatic processes from melt inclusions

Compositions and formation conditions of primitive magmas of the Karymsky volcanic center, Kamchatka: evidence from melt inclusions and trace-element thermobarometry

Low-temperature acidic melts of Bazman volcano (Iran)

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