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Global and regional factors controlling changes of coastlines in Southern Iberia (Spain) during the Holocene

Goy Goy, José Luis and Zazo Cardeña , Caridad and Dabrio, Cristino J. and Lario, Javier and Borja, Francisco and Sierro, Francisco Javier and Flores, José-Abel (1996) Global and regional factors controlling changes of coastlines in Southern Iberia (Spain) during the Holocene. Quaternary science review, 15 (8-9). pp. 773-780. ISSN 0277-3791

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Abstract

The interaction between global (glacio-eustatic sea-level rise) and regional factors
(oceanographic and tectonic) has controlled the evolution of coastline during the Holocene in
Southem Iberia.
At ca. 10,000 14C years BP a deceleration of relative sea-level rise took place both in the Atlantic
and Mediterranean littorals, with a maximum transgression at 6450 14C years BP. In subsiding areas
(present tidal flats) estuaries illustrate a clear marine influence recorded both in sediments and the
fauna while in uplifting areas prograding spit-bar systems developed. Two phases of major
progradation are distinguished in these systems: the first one between 6450 and 3000 14C years BP,
with a sedimentary gap at ca. 4000 14C years BP; and the second one from 2750 14C years BP up to
present, with an intervening gap between 1200 and 1050 14C years BP. These progradation phases
develop during stillstands followed by relative sea-level fall, while the sedimentary gaps represent
relative high sea level. In the Mediterranean areas, with a higher uplift rate, marine terraces almost
coeval to those gaps occur.
The most pronounced modifications in littoral dynamics occurred at between 3000 and 2750 14C
years BP represented by changes in the direction of longshore drift and prevailing winds and in the
predominance of progradation over aggradation processes.
At ca. 1000 14C years BP the estuaries record a greater fluvial than marine influence, and at 500
years ago an extraordinary increase in coastal progradation took place in all littoral zones. The
European Medieval Warm period is characterized, at least during its initial phase, by low pressure
climate conditions, while during the Little Ice Age anticyclonic conditions gave rise to a strong
coastal progradation.


Item Type:Article
Uncontrolled Keywords:Coastlines changes, Southern Iberia, Spain, Holocene, Littoral
Subjects:Sciences > Geology > Stratigraphic geology
ID Code:10864
Deposited On:17 Jun 2010 11:13
Last Modified:27 Aug 2010 09:07

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