Universität zu Köln

Laermanns, Hannes, Pint, Anna, Bellanova, Piero ORCID: 0000-0001-5204-8602, Feist, Lisa ORCID: 0000-0001-6422-4175, Wagner, Barbara, Frank, Sebastian, Mathes-Schmidt, Margret, Scheder, Juliane, Teichner, Felix, Reicherter, Klaus and Brueckner, Helmut (2021). The Santo Andre lagoon at the Atlantic coast of Portugal - Holocene evolution and event history. Paleogeogr. Paleoclimatol. Paleoecol., 571. AMSTERDAM: ELSEVIER. ISSN 1872-616X

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Abstract

The Santo Andre lagoon is located on the southern west coast of Portugal, about 80 km south of Lisbon. Although the beach barrier separating the lagoon from the open sea was occasionally breached in the past and has artificially been opened on an annual basis for the last decades, the lagoon still represents an appropriate geo-bioarchive for reconstructing the Holocene palaeoenvironmental evolution. For this purpose, a 10-m-long sediment core was taken from the centre of the lagoon by using a floating platform. Sedimentological, geochemical and micropalaeontological analyses were performed in order to unravel past sedimentological, environmental and climatic conditions. Due to the lagoon's exposure to storms from the Atlantic and possible tsunamis triggered by earthquakes along the Eurasian-African plate boundary south of Portugal, it is of high interest to identify short-term high energy events that might have crossed or breached the shielding barrier, leaving their footprint in the sedimentary record of the lagoon. The sediment core archived the palaeoenvironmental evolution of the Santo Andre lagoon for at least the last eight millennia. The sandy deposits of the core's lowermost part most likely represent a former coastal flood plain that developed when the postglacial marine transgression had reached the area. The continued sea-level rise deposited alternating layers which indicate varying environmental conditions, characterized by peat growth, stagnant-water areas, as well as disconnections from and reconnections with the open sea. Since approximately 5000 BP, the longshore transport had formed a beach barrier, separating the marine embayment from the open sea and creating a lagoon. In addition, four sudden significant marine inundations between similar to 8500 and 6000 BP are indicated by the sedimentary and microfaunal analyses. Two of these layers can be correlated to extreme wave events (unit B-II), while for the other two layers an ingression caused by sea-level rise or extreme wave events remains debatable.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Laermanns, Hannes UNSPECIFIED UNSPECIFIED UNSPECIFIED Pint, Anna UNSPECIFIED UNSPECIFIED UNSPECIFIED Bellanova, Piero UNSPECIFIED orcid.org/0000-0001-5204-8602 UNSPECIFIED Feist, Lisa UNSPECIFIED orcid.org/0000-0001-6422-4175 UNSPECIFIED Wagner, Barbara UNSPECIFIED UNSPECIFIED UNSPECIFIED Frank, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathes-Schmidt, Margret UNSPECIFIED UNSPECIFIED UNSPECIFIED Scheder, Juliane UNSPECIFIED UNSPECIFIED UNSPECIFIED Teichner, Felix UNSPECIFIED UNSPECIFIED UNSPECIFIED Reicherter, Klaus UNSPECIFIED UNSPECIFIED UNSPECIFIED Brueckner, Helmut UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-581154
DOI:	10.1016/j.palaeo.2021.110366
Journal or Publication Title:	Paleogeogr. Paleoclimatol. Paleoecol.
Volume:	571
Date:	2021
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1872-616X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RELATIVE SEA-LEVEL; ENVIRONMENTAL-CHANGES; TSUNAMI RECURRENCE; GEOLOGICAL RECORD; PACIFIC COAST; ALGARVE COAST; C/N RATIOS; DEPOSITS; PALEOCLIMATE; SEDIMENTS Multiple languages Geography, Physical; Geosciences, Multidisciplinary; Paleontology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58115