Evolution of the eastern volcanic ridge of the Canary Islands based on new KAr data

Coello, José Manuel de Pablos; Cantagrel, J. M.; Hernán, Francisco; Fúster, José-Maria; Ibarrola, Elisa; Ancochea, Eumenio; Casquet, César; Jamond, Colette; Téran, Jóse-Ramón Díaz de; Cendrero, Antonio

doi:10.1016/0377-0273(92)90085-r

Cited by 203 publications

(194 citation statements)

References 31 publications

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“…Sin embargo, buena parte de la superficie insular es fruto de un volcanismo cuaternario que se clasifica desde el punto de vista geológico dentro de las Series Volcáni-cas III y IV del denominado Post-Complejo Basal (Fuster et al, 1968;Ibarrola et al, 1989;Coello et al, 1992;Ancochea et al, 1993). Se trata de un volcanismo de composición basál-tica que morfológicamente destaca por la presencia de grandes conos piroclásticos, algunos de los cuales son los de mayores dimensiones de la isla (Serie III); y por la configuración de una cadena volcánica de conos aislados e imbricados concentrados en los sectores central y septentrional de la isla, de edad würmiense (Serie IV).…”

Section: Características Geomorfológicasunclassified

El Saladar de Bristol: patrimonio vegetal, estado de conservación y propuesta de restauración (Corralejo, Fuerteventura, Islas Canarias)

Bergua¹,

Piedrabuena²,

Alfonso³

2017

BAGE

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El Saladar de Bristol tiene valores naturales y paisajísticos de interés científico, educativo, turístico y, por ende, económico. Es de especial relevancia su patrimonio vegetal con una asociación vegetal única en Fuerteventura, Sarcocornietum perennis, y especies catalogadas por su singularidad para Canarias. Sin embargo, sufre una intensa degradación por la presión urbanística (Corralejo) y las amenazas generales que pesan sobre los humedales y zonas litorales turísticas. Por esta razón, se analizan y cartografían sus comunidades vegetales y se proponen medidas para una adecuada conservación y gestión ambiental.

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Section: Características Geomorfológicasunclassified

El Saladar de Bristol: patrimonio vegetal, estado de conservación y propuesta de restauración (Corralejo, Fuerteventura, Islas Canarias)

Bergua¹,

Piedrabuena²,

Alfonso³

2017

BAGE

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“…It was formed ca. 20 million years ago mainly by volcanic activity (Coello et al 1992;Ancochea et al 1996;Juan et al 2000). Mean altitude is low, with some mountains reaching 600-800 m.a.s.l.…”

Section: The Scenariomentioning

confidence: 99%

Contradiction in Conservation of Island Ecosystems: Plants, Introduced Herbivores and Avian Scavengers in the Canary Islands

Gangoso

Donázar

Scholz³

et al. 2006

Biodivers Conserv

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Abstract. Introduction of alien herbivores in sensitive island systems has resulted in massive effects on vegetation cover, floristic richness and composition of communities; some species can be even totally extirpated by grazing pressure. Goats Capra hircus and wild rabbits Oryctolagus cuniculus were introduced in the Canary Islands around 500 B.C. Barbary ground squirrels Atlantoxerus getulus were introduced in 1967. Traditional extensive livestock exploitations have been maintained to the present but in the last decades the number of goats has sharply increased up to densities of 53 heads/km 2 . Overgrazing and trampling have heavily affected eleven island endemic plant species. Some populations have been reduced to less than 10 viable individuals. On the other hand, goat carcasses and wild rabbit and squirrel populations help to maintain populations of three endangered endemic subspecies of birds. This conflict presents important economic and social ramifications: whereas public funds (mainly through European LIFE projects) are devoted to conservation of plant and avian endemic taxa, the number of goats increases rapidly thanks to subventions derived from the European Common Agricultural Policy (CAP). Similar conflicts are apparent in other Mediterranean Basin insular systems. It is urgently necessary to harmonize farming and conservation objectives in the Canary Islands. The impact of goats on the vegetation should be minimized through limitation of grazing in sensitive areas with high degree of endemism. Creation of 'vulture restaurants' may reduce the dependence of scavengers on extensive livestock exploitations. We recommend a careful study of ecological relationships within island communities where non-native species are susceptible of playing a keystonrole as occurs in the Mediterranean Basin archipelagos.

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“…The Canary volcanism is much younger than the underlying oceanic crust. The oldest subaerial volcanic activity occurred on Fuerteventura at 20 Ma (Coello et al, 1992), whereas the youngest volcanic activity happened in La Palma in historical time.…”

Section: Geological Settingmentioning

confidence: 99%

Morphological and structural analysis in the Anaga offshore massif, Canary Islands: fractures and debris avalanches relationships

Llanes

Muñoz²,

Muñoz-Martı́n

et al. 2003

Mar Geophys Res

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As part of the 'National Hydrographic and Oceanographic Research Plan for the Spanish Exclusive Economic Zone', multibeam bathymetry and seismic reflection profiles were obtained in the Canary Islands aboard the R/V Hespérides. The submarine flanks of the Anaga offshore extension of Tenerife Island are here studied to analyze its geomorphology. In the north sector of the Anaga submarine massif, the extension of the Anaga Debris Avalanche has been mapped for the first time, and a volume of 36 km 3 was calculated. The relationship between the Anaga and Orotava Debris Avalanches is also described. Faulting has been recognized as a key process for the occurrence of debris avalanches and the growth of volcanic lineaments. Moreover, faulting affects previous structures and the channelling of debris flows. Structural analysis shows the typical radial pattern of an oceanic island. In addition, a NE-SW dominant direction of faulting was obtained, consistent with the Tenerife Island structural trend seen in the Anaga Massif and Cordillera Dorsal. NW-SE and E-W are two other main trends seen in the area. Special interest is manifest in two long faults: 'Santa Cruz Fault' bounds the southern edge of Anaga offshore Massif with a length of 50 km and a direction that changes from NE-SW to almost E-W. The Güimar Debris Avalanche was probably channeled by this fault. The 'Guayotá Fault' was recognized in several seismic profiles with a N-S direction that changes towards NW-SE at its southern end. This fault affects the more recent sediments with a vertical offset of 25-30 m, along 60 km. It has been interpreted as a transpressive strike-slip fault.

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Evolution of the eastern volcanic ridge of the Canary Islands based on new KAr data

Cited by 203 publications

References 31 publications

El Saladar de Bristol: patrimonio vegetal, estado de conservación y propuesta de restauración (Corralejo, Fuerteventura, Islas Canarias)

El Saladar de Bristol: patrimonio vegetal, estado de conservación y propuesta de restauración (Corralejo, Fuerteventura, Islas Canarias)

Contradiction in Conservation of Island Ecosystems: Plants, Introduced Herbivores and Avian Scavengers in the Canary Islands

Morphological and structural analysis in the Anaga offshore massif, Canary Islands: fractures and debris avalanches relationships

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