%0 Journal Article %T Magma storage conditions of the last eruption of Teide volcano (Canary Islands, Spain) %+ Institute of Earth Sciences Jaume Almera %+ Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) %+ Magma - UMR7327 %+ Consejo Superior de Investigaciones Cientificas = Spanish National Research Council (CSIC) %A Andújar, Joan %A Costa Rodriguez, Fidel %A Marti, J. %Z This work has been mainly funded by European and Spanish research grants (ERUPT and TECTOTENE projects). %< avec comité de lecture %@ 0258-8900 %J Bulletin of Volcanology %I Springer Verlag %V 72 %P 381-395 %8 2010 %D 2010 %R 10.1007/s00445-009-0325-3 %K Petrology %K Geophysics %K Phonolite %K Experiments %K Tenerife %Z Sciences of the Universe [physics]/Earth Sciences/Volcanology %Z Environmental Sciences/Global ChangesJournal articles %X Phase equilibrium experiments were performed to determine the pre-eruptive conditions of the phonolitic magma responsible for the last eruption (about 1,150 yr B.P.) of Teide volcano. The Lavas Negras phonolite contains 30 to 40 wt% of phenocrysts, mainly anorthoclase, diopside, and magnetite. We have investigated pressures from 100 to 250 MPa, temperatures from 750 to 925°C, water contents from 1.3 to 10 wt%, at an oxygen fugacity (fO2) of 1 log unit above the Ni-NiO solid buffer. Comparison of the natural and experimental phase proportions and compositions indicates that the phonolite was stored at 900 ± 20°C, 150 ± 50 MPa, 3 ± 0.5 wt% dissolved H2O in the melt. The fO2 was probably close to the fayalite-magnetite-quartz solid buffer judging from results of other experimental studies. These conditions constrain the magma storage depth at about 5 ± 1 km below current summit of Teide volcano. Given that the island has not suffered any major structural or topographic changes since the Lavas Negras eruption, any remaining magma from this event should still be stored at such depth and probably with a similar thermal and rheological state. %G English %2 https://insu.hal.science/insu-00447691/document %2 https://insu.hal.science/insu-00447691/file/Andujar_Lavas_Negras_submit_BV_corrected_MC.pdf %L insu-00447691 %U https://insu.hal.science/insu-00447691 %~ OBSPM %~ SDE %~ INSU %~ BRGM %~ CNRS %~ UNIV-ORLEANS %~ ISTO %~ OSUC %~ GIP-BE %~ PSL %~ OBSPM-PSL %~ TEST3-HALCNRS