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|Authors: ||Villasante-Marcos, V.*|
Blanco, M. J.
De Agustín, P.
Di Gangi, F.*
|Title: ||Hydrothermal system of Central Tenerife Volcanic Complex, Canary Islands (Spain), inferred from self-potential measurements.|
|Title of journal: ||Journal of volcanology and geothermal research|
|Series/Report no.: ||/272 (2014)|
|Publisher: ||Elsevier Science Limited|
|Issue Date: ||2014|
|Abstract: ||An extensive self-potential survey was carried out in the central volcanic complex of Tenerife Island (Canary
Islands, Spain). A total amount of ~237 kmof profileswith 20 mspacing betweenmeasurementswas completed,
including radial profiles extending from the summits of Teide and Pico Viejo, and circular profiles inside and
around Las Cañadas caldera and the northern slopes of Teide and Pico Viejo. One of themain results of this mapping
is the detection ofwell-developed hydrothermal systemswithin the edifices of Teide and Pico Viejo, and also
associated with the flank satellite M. Blanca and M. Rajada volcanoes. A strong structural control of the surface
manifestation of these hydrothermal systems is deduced from the data, pointing to the subdivision of Teide
and Pico Viejo hydrothermal systems in three zones: summit crater, upper and lower hydrothermal systems.
Self-potential maxima related to hydrothermal activity are absent from the proximal parts of the NE and NW
rift zones as well as from at least two of the mafic historical eruptions (Chinyero and Siete Fuentes), indicating
that long-lived hydrothermal systems have developed exclusively over relatively shallow felsic magma reservoirs.
Towards Las Cañadas caldera floor and walls, the influence of the central hydrothermal systems disappears
and the self-potential signal is controlled by the topography, the distance to thewater table of Las Cañadas aquifer
and its geometry. Nevertheless, fossil or remanent hydrothermal activity at some points along the Caldera
wall, especially around the Roques de García area, is also suggested by the data. Self-potential data indicate the
existence of independent groundwater systems in the three calderas of Ucanca, Guajara and Diego Hernández,
with a funnel shaped negative anomaly in the Diego Hernández caldera floor related to the subsurface topography
of the caldera bottom. Two other important self-potential features are detected: positive values towards the
northwestern Santiago rift, possibly due to the relatively high altitude of the water-table in this area; and a linear
set ofminima to thewest of Pico Viejo, aligned with the northwestern rift and related to meteoricwater infiltration
along its fracture system.|
|Appears in Collections:||03.04.06. Hydrothermal systems|
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