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Stratigraphy, sedimentology and eruptive mechanism of the El Golfo phreatomagmatic edifice (Lanzarote, Canary Islands)

AutorPedrazzi, Dario ; Martí Molist, Joan ; Geyer, Adelina
Palabras claveCanary Islands
sedimentology
stratigraphy
Fecha de publicación22-abr-2012
ResumenEl Golfo volcano is an example of littoral cone, developed in the western coast of Lanzarote (Canary Islands). El Golfo, together with other edifices of the same age, is aligned along a fracture oriented NEE-SWW coinciding with the main lineation of the historic volcanism in this part of the island. In this contribution we present a detailed stratigraphic study of the succession of deposits and we intepret them in terms of the depositional processes and the eruptive dynamics. The deposits were described following the facies model proposed by Chough and Sohn (1990). The growth of El Golfo tuff cone involved several stages based on variations in depositional processes. The edifice was constructed very rapidly around the vent controlling the amount of water that got access to the eruption conduit. Although the invariable hydromagmatic character of most of the pyroclastic sequence, it is possible to deduce variations in the explosive energy, with a general increment upwards, according to the increase in the degree of fragmentation of pyroclasts, The absence of hyaloclastites, the nature of the palagonite alteration and the observed sedimentary structures, demonstrate the subaereal character of most of the deposits.
URIhttp://hdl.handle.net/10261/162477
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