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Pleistocene and Holocene aeolian facies along the Huelva coast (southern Spain): climatic and neotectonic implications

Zazo Cardeña , Caridad and Dabrio, Cristino J. and Borja, Francisco and Goy Goy, José Luis and Lezine, Anne Marie and Lario Gómez, Javier and Polo Camacho, María Dolores and Hoyos Gómez, Manuel and Boersma, J.R. (1999) Pleistocene and Holocene aeolian facies along the Huelva coast (southern Spain): climatic and neotectonic implications. Geologie en mijnbouw, 77 . pp. 209-224. ISSN 0016-7746

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Abstract

The stratigraphic relationships, genesis and chronology, including radiocarbon dating, of the Quaternary sandy
deposits forming the El Asperillo cliffs (Huelva) were studied with special emphasis on the influence of neotectonic
activity, sea-level changes and climate upon the evolution of the coastal zone. The E-W trending normal fault of
Torre del Loro separates two tectonic blocks. The oldest deposits occur in the upthrown block. They are Early to
Middle Pleistocene fluviatile deposits, probably Late Pleistocene shallow-marine deposits along an E-W trending
shoreline, and Late Pleistocene and Holocene aeolian sands deposited under prevailing southerly winds. Three
Pleistocene and Holocene aeolian units accumulated in the downthrown block. Of these, Unit 1, is separated from
the overlying Unit 2 by a supersurface that represents the end of the Last Interglacial. Accumulation of Unit 2 took
place during the Last Glacial under more arid conditions than Unit 1. The supersurface separating Units 2 and
3 was formed between the Last Glacial maximum at 18 000 14C yr BP and ca. 14 000 14C yr BP, the latter age
corresponding to an acceleration of the rise of sea level. Unit 3 records wet conditions. The supersurface separating
Units 3 and 4 fossilised the fault and the two fault blocks. Units 4 (deposited before the 4th millennium BC), 5 (>
2700 14C yr BP to 16th century) and 6 (16th century to present) record relatively arid conditions. Prevailing wind
directions changed with time fromW (Units 2–4) to WSW (Unit 5) and SW (Unit 6).


Item Type:Article
Uncontrolled Keywords:Chronology, Fluviatile, Marine, Palynology, Sea-level changes
Subjects:Sciences > Geology > Geodynamics
ID Code:16087
Deposited On:27 Jul 2012 09:15
Last Modified:27 Jul 2012 09:15

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