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POSTGLACIAL FORAMINIFERA AND PALEOENVIRONMENTS OF THE MELIDES LAGOON (SW PORTUGAL): TOWARDS A REGIONAL MODEL OF COASTAL EVOLUTION

2007; Cushman Foundation for Foraminiferal Research; Volume: 37; Issue: 2 Linguagem: Inglês

10.2113/gsjfr.37.2.125

1943-264X

Alejandro Cearreta, María Alday, Maria Conceição Freitas, César Andrade,

Maritime and Coastal Archaeology

Research Article| April 01, 2007 POSTGLACIAL FORAMINIFERA AND PALEOENVIRONMENTS OF THE MELIDES LAGOON (SW PORTUGAL): TOWARDS A REGIONAL MODEL OF COASTAL EVOLUTION Alejandro Cearreta; Alejandro Cearreta 3 1Área de Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco/E.H.U., Apartado 644, 48080 Bilbao, Spain. 3Correspondence author. E-mail: alejandro.cearreta@ehu.es Search for other works by this author on: GSW Google Scholar María Alday; María Alday 2Centro e Departamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, Bloco C6, Campo Grande, 1749-016 Lisboa, Portugal. Search for other works by this author on: GSW Google Scholar Maria da Conceição Freitas; Maria da Conceição Freitas 2Centro e Departamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, Bloco C6, Campo Grande, 1749-016 Lisboa, Portugal. Search for other works by this author on: GSW Google Scholar César Andrade César Andrade 2Centro e Departamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, Bloco C6, Campo Grande, 1749-016 Lisboa, Portugal. Search for other works by this author on: GSW Google Scholar Author and Article Information Alejandro Cearreta 3 1Área de Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco/E.H.U., Apartado 644, 48080 Bilbao, Spain. María Alday 2Centro e Departamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, Bloco C6, Campo Grande, 1749-016 Lisboa, Portugal. Maria da Conceição Freitas 2Centro e Departamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, Bloco C6, Campo Grande, 1749-016 Lisboa, Portugal. César Andrade 2Centro e Departamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, Bloco C6, Campo Grande, 1749-016 Lisboa, Portugal. 3Correspondence author. E-mail: alejandro.cearreta@ehu.es Publisher: Cushman Foundation for Foraminiferal Research Received: 15 Sep 2005 Accepted: 18 Dec 2006 First Online: 03 Mar 2017 Online ISSN: 1943-264X Print ISSN: 0096-1191 © 2007 Journal of Foraminiferal Research Journal of Foraminiferal Research (2007) 37 (2): 125–135. https://doi.org/10.2113/gsjfr.37.2.125 Article history Received: 15 Sep 2005 Accepted: 18 Dec 2006 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation Alejandro Cearreta, María Alday, Maria da Conceição Freitas, César Andrade; POSTGLACIAL FORAMINIFERA AND PALEOENVIRONMENTS OF THE MELIDES LAGOON (SW PORTUGAL): TOWARDS A REGIONAL MODEL OF COASTAL EVOLUTION. Journal of Foraminiferal Research 2007;; 37 (2): 125–135. doi: https://doi.org/10.2113/gsjfr.37.2.125 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Foraminiferal Research Search Advanced Search Abstract The foraminiferal assemblages recorded in the modern environment and sedimentary successions of two boreholes drilled in the Melides lagoon have been analyzed and their paleoenvironmental interpretation suggests four stages in the Holocene history of the lagoon. Stage A represents a terrestrial environment older than 11 ka and contemporaneous with a low sea level and a distal shoreline. As a consequence of postglacial sea-level rise, a brackish environment, dominated by the species Ammonia tepida and Brizalina britannica, progressively developed in the area between 11–8 ka. It was followed by a normal-salinity environment with Asterigerinata mamilla, B. britannica and Cribroelphidium excavatum as the main species during the period 8–5.5 ka. This Stage B represents a marine advance into the Melides area characteristic of the lower Holocene worldwide. Around 5.5 ka (Stage C), a coastal lagoon environment developed as a consequence of formation of a sandy barrier, which isolated the previous marine setting from the open sea. Assemblages show that the lagoon was dominantly closed with fresh water to very slightly brackish conditions from 5.5->0.5 ka. Only the highly tolerant species Haynesina germanica is found abundantly in the few intervals containing foraminifera dated between >3.4 and 0.5 k.y., reflects human intervention on the lagoon with land reclamation activities and artificial opening of the inlet. Only H. germanica and A. tepida characterize the modern environment. This general pattern is in agreement with microfossil results obtained from other coastal sedimentary sequences studied during recent years in southwestern Portugal and, therefore, is proposed as a possible regional evolutionary model for the last 12,000 years. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.