Unraveling the Holocene Eruptive History of Flores Island (Azores) Through the Analysis of Lacustrine Sedimentary Records

Lacustrine sequences from active volcanic settings usually hold a rich and continuous record of tephra layers, providing a critical source of information to reconstruct a most complete eruptive history of a region. Lake sedimentary records on volcanic islands are particularly useful as the typical s...

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Autores: Andrade, Mariana, Ramalho, R. S., Pimentel, A., Hernández, Armand, Kutterolf, S., Sáez, A., Benavente-Marín, Mario, Raposeiro, P. M., Giralt, Santiago
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/252897
Acceso en línea:http://hdl.handle.net/10261/252897
Access Level:acceso abierto
Palabra clave:Lake tephrostratigraphy
Ocean island volcanoes
Holocene volcanism
Ragoa da lomba
Flores Island
Glass geochemistry
Azores archipelago
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dc.title.none.fl_str_mv Unraveling the Holocene Eruptive History of Flores Island (Azores) Through the Analysis of Lacustrine Sedimentary Records
title Unraveling the Holocene Eruptive History of Flores Island (Azores) Through the Analysis of Lacustrine Sedimentary Records
spellingShingle Unraveling the Holocene Eruptive History of Flores Island (Azores) Through the Analysis of Lacustrine Sedimentary Records
Andrade, Mariana
Lake tephrostratigraphy
Ocean island volcanoes
Holocene volcanism
Ragoa da lomba
Flores Island
Glass geochemistry
Azores archipelago
title_short Unraveling the Holocene Eruptive History of Flores Island (Azores) Through the Analysis of Lacustrine Sedimentary Records
title_full Unraveling the Holocene Eruptive History of Flores Island (Azores) Through the Analysis of Lacustrine Sedimentary Records
title_fullStr Unraveling the Holocene Eruptive History of Flores Island (Azores) Through the Analysis of Lacustrine Sedimentary Records
title_full_unstemmed Unraveling the Holocene Eruptive History of Flores Island (Azores) Through the Analysis of Lacustrine Sedimentary Records
title_sort Unraveling the Holocene Eruptive History of Flores Island (Azores) Through the Analysis of Lacustrine Sedimentary Records
dc.creator.none.fl_str_mv Andrade, Mariana
Ramalho, R. S.
Pimentel, A.
Hernández, Armand
Kutterolf, S.
Sáez, A.
Benavente-Marín, Mario
Raposeiro, P. M.
Giralt, Santiago
author Andrade, Mariana
author_facet Andrade, Mariana
Ramalho, R. S.
Pimentel, A.
Hernández, Armand
Kutterolf, S.
Sáez, A.
Benavente-Marín, Mario
Raposeiro, P. M.
Giralt, Santiago
author_role author
author2 Ramalho, R. S.
Pimentel, A.
Hernández, Armand
Kutterolf, S.
Sáez, A.
Benavente-Marín, Mario
Raposeiro, P. M.
Giralt, Santiago
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Fundação para a Ciência e a Tecnologia (Portugal)
Ministerio de Economía y Competitividad (España)
Giralt, Santiago [0000-0001-8570-7838]
Hernández, Armand [0000-0001-7245-9863]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Lake tephrostratigraphy
Ocean island volcanoes
Holocene volcanism
Ragoa da lomba
Flores Island
Glass geochemistry
Azores archipelago
topic Lake tephrostratigraphy
Ocean island volcanoes
Holocene volcanism
Ragoa da lomba
Flores Island
Glass geochemistry
Azores archipelago
description Lacustrine sequences from active volcanic settings usually hold a rich and continuous record of tephra layers, providing a critical source of information to reconstruct a most complete eruptive history of a region. Lake sedimentary records on volcanic islands are particularly useful as the typical small size of these islands and their steep subaerial and submarine slopes lead to a lower preservation of potential erodible pyroclastic deposits. Here we explore the lacustrine sedimentary record of Lagoa da Lomba, a crater lake in the central upland area of Flores Island (Azores), to gain insight into the recent eruptive history of this island. The strategic location of Lagoa da Lomba, half distance between the two clusters of recent volcanic activity of the island, together with its long-lasting record, back to 23.52 cal kyr BP, makes this lake a privileged site to investigate the Holocene volcanic history of Flores. Based on a detailed stratigraphic characterization of sediments from a lake transect of three cores, supported by glass shard geochemistry and radiocarbon dating, we recognized four Holocene eruptive events taking place between 6.28 and 2.36 cal kyr BP, demonstrating that the Holocene volcanic activity at Flores Island may have lasted longer than previously reported. Glass shard geochemistry from the different tephra layers suggests three populations, basaltic to trachybasaltic in composition, where the last eruption is the least evolved endmember. Two of the four eruptive events correlate with subaerially-exposed pyroclastic sequences, in terms of stratigraphy and geochemistry. The most recent event recorded at Lagoa da Lomba was constrained to 3.66 – 2.36 cal kyr BP and linked to an eruption sourced from Lagoa Comprida Volcanic System. The second most recent eruptive event was sourced from Lagoa Funda Volcanic System and dated at 3.66 cal kyr BP. Our observations show that Flores experienced vigorous volcanic activity during the Late Holocene. Therefore, contrary to what is assumed, the possibility of future eruptions should be properly considered, and the volcanic hazard here should not be underestimated. Moreover, we highlight the importance of tephrostratigraphy in recent lake sediments to reconstruct past volcanic activity, especially at small volcanic islands, such as Flores, where exposure is poor due to erosion within the limited subaerial area and the dense vegetation. Introduction
publishDate 2021
dc.date.none.fl_str_mv 2021
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/252897
url http://hdl.handle.net/10261/252897
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL 2016-75281-C2
https://doi.org/10.3389/feart.2021.738178
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Frontiers Media
publisher.none.fl_str_mv Frontiers Media
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
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spelling Unraveling the Holocene Eruptive History of Flores Island (Azores) Through the Analysis of Lacustrine Sedimentary RecordsAndrade, MarianaRamalho, R. S.Pimentel, A.Hernández, ArmandKutterolf, S.Sáez, A.Benavente-Marín, MarioRaposeiro, P. M.Giralt, SantiagoLake tephrostratigraphyOcean island volcanoesHolocene volcanismRagoa da lombaFlores IslandGlass geochemistryAzores archipelagoLacustrine sequences from active volcanic settings usually hold a rich and continuous record of tephra layers, providing a critical source of information to reconstruct a most complete eruptive history of a region. Lake sedimentary records on volcanic islands are particularly useful as the typical small size of these islands and their steep subaerial and submarine slopes lead to a lower preservation of potential erodible pyroclastic deposits. Here we explore the lacustrine sedimentary record of Lagoa da Lomba, a crater lake in the central upland area of Flores Island (Azores), to gain insight into the recent eruptive history of this island. The strategic location of Lagoa da Lomba, half distance between the two clusters of recent volcanic activity of the island, together with its long-lasting record, back to 23.52 cal kyr BP, makes this lake a privileged site to investigate the Holocene volcanic history of Flores. Based on a detailed stratigraphic characterization of sediments from a lake transect of three cores, supported by glass shard geochemistry and radiocarbon dating, we recognized four Holocene eruptive events taking place between 6.28 and 2.36 cal kyr BP, demonstrating that the Holocene volcanic activity at Flores Island may have lasted longer than previously reported. Glass shard geochemistry from the different tephra layers suggests three populations, basaltic to trachybasaltic in composition, where the last eruption is the least evolved endmember. Two of the four eruptive events correlate with subaerially-exposed pyroclastic sequences, in terms of stratigraphy and geochemistry. The most recent event recorded at Lagoa da Lomba was constrained to 3.66 – 2.36 cal kyr BP and linked to an eruption sourced from Lagoa Comprida Volcanic System. The second most recent eruptive event was sourced from Lagoa Funda Volcanic System and dated at 3.66 cal kyr BP. Our observations show that Flores experienced vigorous volcanic activity during the Late Holocene. Therefore, contrary to what is assumed, the possibility of future eruptions should be properly considered, and the volcanic hazard here should not be underestimated. Moreover, we highlight the importance of tephrostratigraphy in recent lake sediments to reconstruct past volcanic activity, especially at small volcanic islands, such as Flores, where exposure is poor due to erosion within the limited subaerial area and the dense vegetation. IntroductionMA acknowledges the financial support given through her doctoral grant funded by Fundação para a Ciência e Tecnologia (SFRH/BD/138261/2018). The acquisition of sediment cores was funded by the Spanish Ministry of Economy and Competitiveness through the research project PaleoModes (CGL 2016-75281-C2). The radiocarbon dating was partially funded by FCT through the research project DISCOVERAZORES (PTDC/CTA-AMB/28511/2017), PaleoModes and RapidNAO (CGL 2013-40608-R). RSR and PMR acknowledge their IF/01641/2015 and DL57/2016/ICETA/EEC 2018/25 fellowship funded by FCT, respectively. This work was also supported by projects FCT/UID/GEO/50019/2019 and FCT/UIDB/50019/2020 - IDL funded by FCT.Peer reviewedFrontiers MediaFundação para a Ciência e a Tecnologia (Portugal)Ministerio de Economía y Competitividad (España)Giralt, Santiago [0000-0001-8570-7838]Hernández, Armand [0000-0001-7245-9863]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202120212021info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/252897reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL 2016-75281-C2https://doi.org/10.3389/feart.2021.738178Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2528972026-05-22T06:33:51Z
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