8000 years of environmental evolution of barrier–lagoon systems emplaced in coastal embayments (NW Iberia)
The rocky and indented coast of NW Iberia is characterized by the presence of highly valuable and vulnerable, small and shallow barrier–lagoon systems structurally controlled. The case study was selected to analyse barrier–lagoon evolution based on detailed sedimentary architecture, chronology, geoc...
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crsagepubl:10.1177/0959683615591351 2024-09-09T19:57:47+00:00 8000 years of environmental evolution of barrier–lagoon systems emplaced in coastal embayments (NW Iberia) González-Villanueva, Rita Pérez-Arlucea, Marta Costas, Susana Bao, Roberto Otero, Xose L Goble, Ronald 2015 http://dx.doi.org/10.1177/0959683615591351 http://journals.sagepub.com/doi/pdf/10.1177/0959683615591351 http://journals.sagepub.com/doi/full-xml/10.1177/0959683615591351 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 25, issue 11, page 1786-1801 ISSN 0959-6836 1477-0911 journal-article 2015 crsagepubl https://doi.org/10.1177/0959683615591351 2024-07-22T04:30:37Z The rocky and indented coast of NW Iberia is characterized by the presence of highly valuable and vulnerable, small and shallow barrier–lagoon systems structurally controlled. The case study was selected to analyse barrier–lagoon evolution based on detailed sedimentary architecture, chronology, geochemical and biological proxies. The main objective is to test the hypothesis of structural control and the significance at regional scale of any high-energy event recorded. This work is also aimed at identifying general patterns and conceptualizing the formation and evolution of this type of coastal systems. The results allowed us to establish a conceptual model of Holocene evolution that applies to rock-bounded barrier–lagoon systems. The initial stage (early Holocene) is characterized by freshwater peat sedimentation and ended by marine flooding. The timing of the marine flooding depends on the relation between the elevation of the basin and the relative mean sea-level position; the lower the topography, the earlier the marine inundation. Thus, the age of basin inundation ranged from 8 to 4 ka BP supporting significant structural differences. Once marine inundation occurred, all systems followed similar evolutionary patterns characterized by a phase of landward barrier migration and aeolian sedimentation towards the back-barrier (i.e. retrogradation) that extended circa 3.5 ka BP. The later phases of evolution are characterized by a general trend to the stabilization of the barriers and the infilling of the lagoons. This stabilization may be temporally interrupted by episodes of enhanced storminess or sediment scarcity. In this regard, washover deposits identified within the sedimentary architecture of the case study explored here suggest pervasive high-energy events coeval with some of the cooling events identified in the North Atlantic during the mid- to late Holocene. Article in Journal/Newspaper North Atlantic SAGE Publications The Holocene 25 11 1786 1801 |
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The rocky and indented coast of NW Iberia is characterized by the presence of highly valuable and vulnerable, small and shallow barrier–lagoon systems structurally controlled. The case study was selected to analyse barrier–lagoon evolution based on detailed sedimentary architecture, chronology, geochemical and biological proxies. The main objective is to test the hypothesis of structural control and the significance at regional scale of any high-energy event recorded. This work is also aimed at identifying general patterns and conceptualizing the formation and evolution of this type of coastal systems. The results allowed us to establish a conceptual model of Holocene evolution that applies to rock-bounded barrier–lagoon systems. The initial stage (early Holocene) is characterized by freshwater peat sedimentation and ended by marine flooding. The timing of the marine flooding depends on the relation between the elevation of the basin and the relative mean sea-level position; the lower the topography, the earlier the marine inundation. Thus, the age of basin inundation ranged from 8 to 4 ka BP supporting significant structural differences. Once marine inundation occurred, all systems followed similar evolutionary patterns characterized by a phase of landward barrier migration and aeolian sedimentation towards the back-barrier (i.e. retrogradation) that extended circa 3.5 ka BP. The later phases of evolution are characterized by a general trend to the stabilization of the barriers and the infilling of the lagoons. This stabilization may be temporally interrupted by episodes of enhanced storminess or sediment scarcity. In this regard, washover deposits identified within the sedimentary architecture of the case study explored here suggest pervasive high-energy events coeval with some of the cooling events identified in the North Atlantic during the mid- to late Holocene. |
format |
Article in Journal/Newspaper |
author |
González-Villanueva, Rita Pérez-Arlucea, Marta Costas, Susana Bao, Roberto Otero, Xose L Goble, Ronald |
spellingShingle |
González-Villanueva, Rita Pérez-Arlucea, Marta Costas, Susana Bao, Roberto Otero, Xose L Goble, Ronald 8000 years of environmental evolution of barrier–lagoon systems emplaced in coastal embayments (NW Iberia) |
author_facet |
González-Villanueva, Rita Pérez-Arlucea, Marta Costas, Susana Bao, Roberto Otero, Xose L Goble, Ronald |
author_sort |
González-Villanueva, Rita |
title |
8000 years of environmental evolution of barrier–lagoon systems emplaced in coastal embayments (NW Iberia) |
title_short |
8000 years of environmental evolution of barrier–lagoon systems emplaced in coastal embayments (NW Iberia) |
title_full |
8000 years of environmental evolution of barrier–lagoon systems emplaced in coastal embayments (NW Iberia) |
title_fullStr |
8000 years of environmental evolution of barrier–lagoon systems emplaced in coastal embayments (NW Iberia) |
title_full_unstemmed |
8000 years of environmental evolution of barrier–lagoon systems emplaced in coastal embayments (NW Iberia) |
title_sort |
8000 years of environmental evolution of barrier–lagoon systems emplaced in coastal embayments (nw iberia) |
publisher |
SAGE Publications |
publishDate |
2015 |
url |
http://dx.doi.org/10.1177/0959683615591351 http://journals.sagepub.com/doi/pdf/10.1177/0959683615591351 http://journals.sagepub.com/doi/full-xml/10.1177/0959683615591351 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
The Holocene volume 25, issue 11, page 1786-1801 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683615591351 |
container_title |
The Holocene |
container_volume |
25 |
container_issue |
11 |
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1786 |
op_container_end_page |
1801 |
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1809928732079554560 |