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Cambios en la dinámica litoral y nivel del mar durante el Holoceno en el Sur de Iberia y Canarias Orientales

Zazo Cardeña, Caridad and Dabrio, Cristino J. and Goy Goy, José Luis and Bardají Azcárate, Teresa and Ghaleb, B. and Lario, Javier and Hoyos, M. and Hillaire-Marcel, Claude and Sierro, Francisco Javier and Flores, José-Abel and Silva Barroso, Pablo Gabriel and Borja, Francisco (1996) Cambios en la dinámica litoral y nivel del mar durante el Holoceno en el Sur de Iberia y Canarias Orientales. Geogaceta, 20 (7). pp. 1679-1682. ISSN 0213-683X

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Abstract

The interaction between global factors ("global" glacio-eustatic sea-level rise) and regional factors
(tectonic trend, oceanographic factor) is analyzed in different areas of the Iberian and Canary Island
littoral. Sea-level changes and c1imatic variations are stated for the Mediterranean and Atlantic littorals,
with different tidal ranges and tectonic trends. Different stages can be envisaged in the coastal evolution
of almost all the analyzed areas from the beginning of Holocene (10.000 BP): at ca. 7.000 BP (Flandrian
maximum) with a change from open estuaries to aggradational processes (Cádiz Gulf subsiding area),
basal peat (Valencia Gulf, subsiding area) and development of microcliffs (Mediterranean uplifting areas).
From 7,000 to 2,700 BP a first progradation phase with development of spit bars took place in the
mediterranean uplifting areas, whilst in the atlantic subsiding one starts the aggradation processes in the
formerly open estuaries, an also from ca.4,OOO BP development of spit-bar system. A second progradation
phase ofthe spit bars systems occurs between 2,400 and 500 BP both in Almería and Cádiz Gulf where
a change from aggradation to progradation takes place in the estuary environments, and with a change
in the direction of longshore drift (Mediterranean) and prevailing winds (both areas) at ca.2,400 BP. At ca.
1,200 BP a sudden paleogeographic change took place in estuary environments. From 500 BP up to
nowa marked in crease of coastal progradation in all littorals is observed. Climatic interpretations led to
correlate anticyclonic conditions (as it happened during Little Ice Ages) with the growing of spit bar
systems and progradation, while low pressure conditions (as during Medieval Warm Period) coincides
with no progradation. In the Canary Islands, the development of storm ridges at ca. 3,500 BP can be
correlated with an intensification of trade winds.


Item Type:Article
Uncontrolled Keywords:Southern Iberia; Canary Islands; Holocene; Sea-level changes; Climate; Aggradation-progradation; Longshore drift-prevailing winds
Subjects:Sciences > Geology > Stratigraphic geology
Sciences > Geology > Geodynamics
ID Code:10870
Deposited On:18 Jun 2010 08:52
Last Modified:30 Apr 2014 09:46

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