Physical and chemical variations of volcanic rocks from historical eruptions of Klyuchevskoy volcano, Kamchatka

Bergal-Kuvikas, O.V.; Churikova, T.G.; Gordeychik, B.N.; Ladygin, V.M.; Kronz, A.; Wörner, G.

Авторы: Bergal-Kuvikas O.V., Churikova T.G., Gordeychik B.N., Ladygin V.M., Kronz A., Wörner G.
Сборник: Abstract volume of XII L.L. Perchuk International School of Earth Sciences (I.S.E.S.-2020), Petropavlovsk-Kamchatsky, September 11-15, 2020
Тезисы
Год издания: 2020
Место издания: IVS FEB RAS, Petropavlovsk-Kamchatsky
Первая страница: 65
Последняя страница: 65
Аннотация: Changing of physical parameters (density, buoyancy, viscosity) and geochemical compositions (SiO2, volatiles) of magmas are triggers or inhibitors of volcanic eruptions (e.g. Corsaro, Pompillo, 2004). Density and viscosity variations are related with magma compositions and water content (Richet et al., 2000; Sparks, Huppert, 1984). In order to examine process of magma ascent and residence in the crust we combine geochemical and isotopic studies (Bergal-Kuvikas et al., 2017; Dorendorf et al., 2000), microprobe analyses of the olivines and estimate physical properties of the magmas (Ladygin, Frolova, 2002). Observed data of physical properties of erupted lavas at Klyuchevskoy volcano show good correlations between densities and magma compositions. More dense magmas (2.8–2.9 g/cm3) have more primitive compositions (~6–9 wt.% MgO) and erupt from vents at the lower slopes (~500–700 m) of the volcano with large, voluminous lava flows. In contrast, more differentiated lavas (~4–6 wt.% MgO) are less dense (1.8–2.3 g/cm3) and dominate eruptions on from the summit crater at ~4500 m. Fractional crystallization is a driving volatile-enrichment and compositional changes in the magma system and this controls ascent and the elevation of vents via changing density and buoyancy. This also explains the higher explosivity with ultra-strombolian eruption style of volatile-rich, low-density lavas from the summit crater whereas volatile-poorer and denser lavas erupt from vents lower down on the flanks of the volcano. This research was supported by RFBR-DFG grant # 16-55-12040 and #20-55-50001.
Добавил в систему: Гордейчик Борис Николаевич

	ИСТИНА	Войти в систему Регистрация
	Интеллектуальная Система Тематического Исследования НАукометрических данных
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

Интеллектуальная Система Тематического Исследования НАукометрических данных

Physical and chemical variations of volcanic rocks from historical eruptions of Klyuchevskoy volcano, Kamchatkaтезисы доклада Тезисы

Прикрепленные файлы