Cíes Islands: a wind trap in the Ria of Vigo (Galicia, Spain) at the end of the Last Glacial
DOI:
https://doi.org/10.55407/geogaceta102257Keywords:
coastal eolianites, OSL-dating, upper pleistocene, glacio-eustasy, Cies Islands, Galicia (NW of Spain)Abstract
Cies Islands have been an obstacle to the intense coastal winds from the North Atlantic, especially during the Quaternary glacial cycles. At the end of the Last Glacial period, the local sedimentary-record shows that sea-level decreased more than 100 m below present level. This sea-level drop transformed the archipelago into an emerged relief 300 m high, which probably deflected the wind and, at the same time, was able to capture aeolian sediments coming from a strip of the continental shelf also emerged. Under this hypothesis, these aeolian materials were deposited covering the contour of Cies Islands. An example of these aeolian accretion processes is the eolianites outcrop located at Monteagudo Island (Cies Islands, Galicia, Spain) interpreted as a climbing-dune which was active from the end of the Upper Pleistocene, partially covering the eastern slope. This deposit more than 3 meters thick with an OSL age of 35 ky (b2k) at the base and 17 ky at the top, is an evidence of the aeolisation developed in the Galician coast for thousands of years, finally disrupted when aeolian-supplies were suspended during Holocene post-glacial.
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