Magma plumbing beneath Anak Krakatau volcano, Indonesia: evidence for multiple magma storage regions

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Авторы: Dahren B.     Troll V.R.     Andersson U.B.     Chadwick J.P.     Gardner M.F.     Jaxybulatov K.   (ИНГГ СО РАН)   Koulakov I.   (ИНГГ СО РАН)  
дата публикации: 2012
Understanding magma plumbing is essential for predicting the behaviour of explosive volcanoes. We investigate magma plumbing at the highly active Anak Krakatau volcano (Indonesia), situated on the rim of the 1883 Krakatau caldera by employing a suite of thermobarometric models. These include clinopyroxene-melt thermobarometry, plagioclase-melt thermobarometry, clinopyroxene composition barometry and olivine-melt thermometry. Petrological studies have previously identified shallow magma storage in the region of 2-8 km beneath Krakatau, while existing seismic evidence points towards mid- to deep-crustal storage zone(s), at 9 and 22 km, respectively. Our results show that clinopyroxene in Anak Krakatau lavas crystallized at a depth of 7-12 km, while plagioclase records both shallow crustal (3-7 km) and sub-Moho (23-28 km) levels of crystallization. These magma storage regions coincide with well-constrained major lithological boundaries in the crust, implying that magma ascent and storage at Anak Krakatau is strongly controlled by crustal properties.
первоисточник: Contributions to Mineralogy and Petrology
том: 4
страницы: 631-651
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