Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal)
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/17155 |
Resumo: | This study addresses the Holocene sedimentary succession at Martinhal coastal lowland (Algarve), a site recording the AD1755 Lisbon tsunami. Data on twenty-four short cores and sixteen trenches, retrieved from both the literature and new field work were combined to improve the stratigraphic resolution and lateral correlation of sedimentary units accumulated in this lowland. Four fining-upward depositional sequences (S1 to S4) were identified, showing spatial variation with maximum thickness - S1: 0-3 m; S2: 1.0-2.4 m; S3: 0.2-1.0 m; S4: 0.3-2.3 m. Sequences S1, S2 and S3 consist of medium to coarse yellow sands with levels rich in bioclasts that give place upsequence to brown organic silt and clay. Sequences S1 to S3 testify to the progressive infilling of a small estuary, coeval with the progressive development and changes in efficiency of a sandy barrier. The uppermost sequence (S4) is clearly different and also shows contrast in facies at seaward and landward locations. S4 comprises: 1) seaward (ESE), a basal subunit with boulders to pebbly gravels and coarse to medium well sorted sands, interpreted as deposited by the AD1755 tsunami, covered by an upper subunit comprising an alternation of well sorted white sands and brown silts, interpreted as aeolian/washover and flood deposits; 2) upstream (WNW), alternating layers of poorly sorted very coarse to medium sands and brown silts represent flood plain accretion and channel infill within the lowland. Quartz OSL dating was done by measuring small aliquots in samples from the AD1755 event-layer and large aliquots in samples from other deposits. The coarser and more basal sediment of the AD1755 sediment yielded overestimated OSL ages due to partial bleaching; at the top, and in finer sediment, and also in the more landward locations, OSL ages are closer to the true age of this event. At this location, routine Quartz OSL dating using large aliquots can give useful data on the burial ages for a variety of sediments, provided that the burial time exceeds ca. 1 ky. In contrast, recent abrupt-event sediments should be dated by measuring small aliquots or single grains to get a better control on partial bleaching effects on OSL results. |
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Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal)tsunami depositsluminescence datingsedimentologystratigraphic correlationAlgarveThis study addresses the Holocene sedimentary succession at Martinhal coastal lowland (Algarve), a site recording the AD1755 Lisbon tsunami. Data on twenty-four short cores and sixteen trenches, retrieved from both the literature and new field work were combined to improve the stratigraphic resolution and lateral correlation of sedimentary units accumulated in this lowland. Four fining-upward depositional sequences (S1 to S4) were identified, showing spatial variation with maximum thickness - S1: 0-3 m; S2: 1.0-2.4 m; S3: 0.2-1.0 m; S4: 0.3-2.3 m. Sequences S1, S2 and S3 consist of medium to coarse yellow sands with levels rich in bioclasts that give place upsequence to brown organic silt and clay. Sequences S1 to S3 testify to the progressive infilling of a small estuary, coeval with the progressive development and changes in efficiency of a sandy barrier. The uppermost sequence (S4) is clearly different and also shows contrast in facies at seaward and landward locations. S4 comprises: 1) seaward (ESE), a basal subunit with boulders to pebbly gravels and coarse to medium well sorted sands, interpreted as deposited by the AD1755 tsunami, covered by an upper subunit comprising an alternation of well sorted white sands and brown silts, interpreted as aeolian/washover and flood deposits; 2) upstream (WNW), alternating layers of poorly sorted very coarse to medium sands and brown silts represent flood plain accretion and channel infill within the lowland. Quartz OSL dating was done by measuring small aliquots in samples from the AD1755 event-layer and large aliquots in samples from other deposits. The coarser and more basal sediment of the AD1755 sediment yielded overestimated OSL ages due to partial bleaching; at the top, and in finer sediment, and also in the more landward locations, OSL ages are closer to the true age of this event. At this location, routine Quartz OSL dating using large aliquots can give useful data on the burial ages for a variety of sediments, provided that the burial time exceeds ca. 1 ky. In contrast, recent abrupt-event sediments should be dated by measuring small aliquots or single grains to get a better control on partial bleaching effects on OSL results.V. Díaz del Río, P. Bárcenas, L.M. Fernández-Salas, N. López-González, D. Palomino, J.L. Rueda, O. Sánchez-Guillamón, J.T. Vázquez Grupo de Geociencias Marinas (GEMAR) Centro Oceanográfico de Málaga Instituto Español de Oceanografía Ministerio de Economía y Competitividad2016-02-01T09:45:38Z2016-02-012015-09-21T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/17155http://hdl.handle.net/10174/17155porCunha,P.P., Andrade, C., Freitas, M. C., Dinis, J., Martins, A.A., Costa, P.J.M., Oliveira, M.A.,Buylaert, J.P., Murray, A. & Marques, S., 2015. Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal).Resúmenes sobre el VIII Simposio Sobre El Margen Ibérico Atlántico (MIA15), Málaga, 213 - 216pcunha@dct.uc.ptndndndaam@uevora.ptndndndndnd247Cunha, PedroAndrade, CésarFreitas, MariaDinis, JorgeMartins, AntónioCosta, PedroOliveira, M.A.Buylaert, Jan-PieterMurray, AndrewMarques, S.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:04:30Zoai:dspace.uevora.pt:10174/17155Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:09:24.857352Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal) |
title |
Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal) |
spellingShingle |
Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal) Cunha, Pedro tsunami deposits luminescence dating sedimentology stratigraphic correlation Algarve |
title_short |
Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal) |
title_full |
Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal) |
title_fullStr |
Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal) |
title_full_unstemmed |
Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal) |
title_sort |
Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal) |
author |
Cunha, Pedro |
author_facet |
Cunha, Pedro Andrade, César Freitas, Maria Dinis, Jorge Martins, António Costa, Pedro Oliveira, M.A. Buylaert, Jan-Pieter Murray, Andrew Marques, S. |
author_role |
author |
author2 |
Andrade, César Freitas, Maria Dinis, Jorge Martins, António Costa, Pedro Oliveira, M.A. Buylaert, Jan-Pieter Murray, Andrew Marques, S. |
author2_role |
author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Cunha, Pedro Andrade, César Freitas, Maria Dinis, Jorge Martins, António Costa, Pedro Oliveira, M.A. Buylaert, Jan-Pieter Murray, Andrew Marques, S. |
dc.subject.por.fl_str_mv |
tsunami deposits luminescence dating sedimentology stratigraphic correlation Algarve |
topic |
tsunami deposits luminescence dating sedimentology stratigraphic correlation Algarve |
description |
This study addresses the Holocene sedimentary succession at Martinhal coastal lowland (Algarve), a site recording the AD1755 Lisbon tsunami. Data on twenty-four short cores and sixteen trenches, retrieved from both the literature and new field work were combined to improve the stratigraphic resolution and lateral correlation of sedimentary units accumulated in this lowland. Four fining-upward depositional sequences (S1 to S4) were identified, showing spatial variation with maximum thickness - S1: 0-3 m; S2: 1.0-2.4 m; S3: 0.2-1.0 m; S4: 0.3-2.3 m. Sequences S1, S2 and S3 consist of medium to coarse yellow sands with levels rich in bioclasts that give place upsequence to brown organic silt and clay. Sequences S1 to S3 testify to the progressive infilling of a small estuary, coeval with the progressive development and changes in efficiency of a sandy barrier. The uppermost sequence (S4) is clearly different and also shows contrast in facies at seaward and landward locations. S4 comprises: 1) seaward (ESE), a basal subunit with boulders to pebbly gravels and coarse to medium well sorted sands, interpreted as deposited by the AD1755 tsunami, covered by an upper subunit comprising an alternation of well sorted white sands and brown silts, interpreted as aeolian/washover and flood deposits; 2) upstream (WNW), alternating layers of poorly sorted very coarse to medium sands and brown silts represent flood plain accretion and channel infill within the lowland. Quartz OSL dating was done by measuring small aliquots in samples from the AD1755 event-layer and large aliquots in samples from other deposits. The coarser and more basal sediment of the AD1755 sediment yielded overestimated OSL ages due to partial bleaching; at the top, and in finer sediment, and also in the more landward locations, OSL ages are closer to the true age of this event. At this location, routine Quartz OSL dating using large aliquots can give useful data on the burial ages for a variety of sediments, provided that the burial time exceeds ca. 1 ky. In contrast, recent abrupt-event sediments should be dated by measuring small aliquots or single grains to get a better control on partial bleaching effects on OSL results. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-09-21T00:00:00Z 2016-02-01T09:45:38Z 2016-02-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/17155 http://hdl.handle.net/10174/17155 |
url |
http://hdl.handle.net/10174/17155 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Cunha,P.P., Andrade, C., Freitas, M. C., Dinis, J., Martins, A.A., Costa, P.J.M., Oliveira, M.A.,Buylaert, J.P., Murray, A. & Marques, S., 2015. Characterization of the sedimentary record of the AD1755 tsunami in the Martinhal Holocene succession (Algarve, Portugal) Caracterização do registo sedimentar do tsunami de 1755, na sucessão holocénica do Martinhal (Algarve, Portugal).Resúmenes sobre el VIII Simposio Sobre El Margen Ibérico Atlántico (MIA15), Málaga, 213 - 216 pcunha@dct.uc.pt nd nd nd aam@uevora.pt nd nd nd nd nd 247 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
V. Díaz del Río, P. Bárcenas, L.M. Fernández-Salas, N. López-González, D. Palomino, J.L. Rueda, O. Sánchez-Guillamón, J.T. Vázquez Grupo de Geociencias Marinas (GEMAR) Centro Oceanográfico de Málaga Instituto Español de Oceanografía Ministerio de Economía y Competitividad |
publisher.none.fl_str_mv |
V. Díaz del Río, P. Bárcenas, L.M. Fernández-Salas, N. López-González, D. Palomino, J.L. Rueda, O. Sánchez-Guillamón, J.T. Vázquez Grupo de Geociencias Marinas (GEMAR) Centro Oceanográfico de Málaga Instituto Español de Oceanografía Ministerio de Economía y Competitividad |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799136576478904320 |