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Magma storage conditions of the last eruption of Teide volcano (Canary Islands, Spain)

Content Provider	Springer Nature Link
Author	Andújar, J. Costa, F. Martí, J.
Copyright Year	2009
Abstract	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.
Starting Page	381
Ending Page	395
Page Count	15
File Format	PDF
ISSN	02588900
Journal	Bulletin of Volcanology
Volume Number	72
Issue Number	4
e-ISSN	14320819
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-12-01
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Petrology Geophysics Phonolite Experiments Tenerife Sedimentology Mineralogy Geophysics/Geodesy Geology
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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