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Sea level and climate changes in the Cabo De Gata Lagoon (Almeria) during the last 6500 YR BP

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1998
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Atribución-NoComercial-SinDerivadas 4.0 Internacional
info:eu-repo/semantics/openAccess
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INQUA, International Union For Quaternary Research
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The Holocene evolution of the lagoon of Cabo de Gata in the geodynamic framework of the south-eastem lberian Península is presented for the first time. The work is based on detail geomorphological mapping of the Quaternary deposits, and radiocarbon measurements of samples collected in the spit barrier systems. The genesis of the Cabo de Gata and Roquetas lagoons is connected to the joint action of three factors. ( l ) Neotectonics, that controlled the occurrence of lowlands. (2) The general glacio-eustatic, Holocene transgression, that brought the sea level to elevations 1.5-2 m above its present values and, eventually, flooded the lowlands during the Flandrian maximum ca. 6500 yr BP. (3) The climate (humidity/aridity) that influenced the sediment supply to the coast and also the small fluctuations of sea level after the Flandrian maximum. Four spit-barrier units have been distinguished. Deposition of the two older ones (H1 and H2 ) took place between ca. 6500 and ca. 2500 yr BP under longshore drift towards the NW. Both units enclosed a lagoon that ·is placed to the NE of its present position. The more recent units (H3 and H4) close the present lagoon and were deposited between ca. 2300 and present under longshore drift to the SE. A more hum id period has been identified during the Gap separating units H1 and H2 (ca. 4400- 4200 yr BP) when most holocene alluvial fans were deposited. Aridity increased after ca. 2500 yr BP when aeolian <lunes began accumulating under prevailing winds from the SW. Although pollen diagrams record clear man-induced impacts, there is strong evidence of natural changes of climatic parameters also taking place. These are recorded as shifting wind directions, reversion of longshore drift both in Cabo de Gata and Roquetas at ca. 2500 yrBP, and the beginning of aeolian dune accumulation.
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Facultad de Ciencias
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Ciencias Analíticas
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Geología Aplicada al Medio Ambiente (GAMA)
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