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Magma Chambers beneath the Klyuchevskoy Volcanic Group

Khubunaya S.A., Gontovaya L.I., Sobolev A.V., Nizkous I.V. (2007) Magma Chambers beneath the Klyuchevskoy Volcanic Group // Journal of Volcanology and Seismology. Vol. 1, No. 2. pp. 98-118. doi: 0.1134/S0742046307020029.

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Официальный URL: http://link.springer.com/article/10.1134/S07420463...

Аннотация

A 3D velocity model of the Earth's crust beneath the Klyuchevskoy volcanic group has been constructed using the seismic tomography method. Anomalies of the velocity parameters related to the zones of magma supply to active volcanoes have been distinguished. Petrological data on the composition, temperature, and pressure of generation and crystallization of primary melts of Klyuchevskoy volcano magnesian basalts have been obtained. The primary melt corresponds to picrite (MgO = 13-14 wt %) with an ultimate saturation of SiO2 (49-50 wt %), a high H2O content (2.2-2.9%), and incompatible elements (Sr, Rb, Ba, Hf). This melt is formed at pressures of 15-20 kbar and temperatures of 1280--1320С . Its further crystallization proceeds in intermediate magma chambers at two discrete pressure levels (i.e., greater than 6, and 1-2 kbar). The results of the petrological studies are in good agreement with the seismotomographic model.

Аннотация (перевод)

Поступила в редакцию 1. 11. 2006 г. Методом сейсмической томографии построена объемная скоростная модель земной коры под Ключевской группой вулканов. Выделены аномалии скоростных параметров связанных с зонами магматического питания активных вулканов. Получены петрологические данные о составе, температуре и давлении генерации и кристаллизации родоначальных расплавов магнезиальных базальтов Ключевского вулкана. Родоначальный расплав отвечает пикриту (MgO=13-14%,мас) с предельным насыщением SiO2 (49-50%, мас.), высоким содержанием H2O (2,2-2.9%) и несовместимыми элементами (Sr, Rb, Ba, Hf). Он образуется при давлениях 15-20 кбар и температурах 1280-13200С. Его дальнейшая кристаллизация проходит в промежуточных магматических камерах при двух дискретных уровнях давлений (более 6 и 1-2 кбар). Результаты петрологических исследований находятся в хорошем соответствии с сейсмотомографической моделью.
Тип объекта: Статья
Название: Magma Chambers beneath the Klyuchevskoy Volcanic Group
Название (перевод): Магматические очаги под Ключевской группой вулканов
Язык: English
Издание: Journal of Volcanology and Seismology
ISSN Print: 0742-0463
ISSN Online: 1819-7108
Тематика: ГРНТИ - Государственный рубрикатор научно-технической информации > 38 ГЕОЛОГИЯ > 38.37 Петрография > 38.37.19 Магматизм и магматические горные породы
ГРНТИ - Государственный рубрикатор научно-технической информации > 38 ГЕОЛОГИЯ > 38.37 Петрография > 38.37.25 Вулканология
Вулканы > 1 Вулканы Курило-Камчатского региона > 1.1 Камчатка > Ключевской
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Дополнительная информация: Original Russian Text © S.A. Khubunaya, L.I. Gontovaya, A.V. Sobolev, I.V. Nizkous, 2007, published in Vulkanologiya i Seismologiya, 2007, No. 2, pp. 32–54.
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