Evolución paleoambiental holocena de la Bahía Algeciras/Gibraltar
- M.J. Clemente-Pérez 1
- M.L. González-Regalado 1
- J. Rodríguez-Vidal 1
- L.M. Cáceres 1
- A. Toscano 1
- P. Gómez 1
- F. Ruiz 1
- M. Abad 2
- C. Finlayson 3
- G. Finlayson 3
- D. Fa 4
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1
Universidad de Huelva
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2
Universidad de Atacama
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- 3 The Gibraltar Museum
- 4 The University of Gibraltar
ISSN: 1576-5172
Année de publication: 2016
Titre de la publication: IX CONGRESO GEOLÓGICO DE ESPAÑA
Número: 16
Pages: 395-398
Type: Article
D'autres publications dans: Geotemas (Madrid)
Résumé
During the Holocene Algeciras/Gibraltar Bay has experienced sea-level fluctuations that have affected the sedimentary processes and have conditioned its environmental evolution. This study analyses various geotechnical cores drilled at the northern end of the Rock of Gibraltar, in the so-called "The Inundation lagoon", close to the airfield. Sedimentological and paleontological analyses of these cores have provided data on the mid-late Holocene environmental evolution of Algeciras/Gibraltar Bay. We have identified five evolutionary stages controlled by sea level rise during the present interglacial highstand, coastal dynamics, high-energy marine events and anthropogenic activity. The sequence registers an early marine infralittoral stage gradually evolving into marginal marine conditions (bay). This bay was open or closed intermittently to the sea, giving way to a coastal lagoon. This lagoon rapidly silted up, with high -energy events recorded by the association of marine fauna, which have been linked to the tsunami that followed the 1755 Lisbon earthquake. The final stage of the silting up process corresponds to a terrestrial sedimentation with very recent anthropogenic deposits at the top of the sequence.