Hydrothermal system of Central Tenerife Volcanic Complex, Canary Islands (Spain), inferred from self-potential measurements

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• 作者：V铆ctor Villasante-Marcos ; Anthony Finizola ; Rafael Abella ; St茅phanie Barde-Cabusson ; Mar铆a Jos茅 Blanco ; Beatriz Brenes ; V铆ctor Cabrera ; Benito Casas ; Pablo De Agust铆n ; Fabio Di Gangi ; Itahiza Dom铆nguez ; Olaya Garc铆a ; Almudena Gomis ; Juan Guzm谩n ; Ilazki帽e Iribarren ; Guillaume Levieux ; Carmen L贸pez ; Natividad Luengo-Oroz ; Isidoro Mart铆n ; Manuel Moreno ; Stavros Meletlidis ; et al.
• 关键词：Self-potential ; Hydrothermal system ; Tenerife ; Teide ; Pico Viejo
• 刊名：Journal of Volcanology and Geothermal Research
• 出版年：15 February, 2014
• 年：2014
• 卷：272
• 期：Complete
• 页码：59-77
• 全文大小：5811 K

文摘

An extensive self-potential survey was carried out in the central volcanic complex of Tenerife Island (Canary Islands, Spain). A total amount of ~ 237 km of profiles with 20 m spacing between measurements was completed, including radial profiles extending from the summits of Teide and Pico Viejo, and circular profiles inside and around Las Ca帽adas caldera and the northern slopes of Teide and Pico Viejo. One of the main results of this mapping is the detection of well-developed hydrothermal systems within 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 Ca帽adas 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 the water table of Las Ca帽adas aquifer and its geometry. Nevertheless, fossil or remanent hydrothermal activity at some points along the Caldera wall, especially around the Roques de Garc铆a 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 Hern谩ndez, with a funnel shaped negative anomaly in the Diego Hern谩ndez 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 of minima to the west of Pico Viejo, aligned with the northwestern rift and related to meteoric water infiltration along its fracture system.