Holocene marine tephra offshore Ecuador and Southern Colombia: First trench‐to‐arc correlations and implication for magnitude of major eruptions
| العنوان: | Holocene marine tephra offshore Ecuador and Southern Colombia: First trench‐to‐arc correlations and implication for magnitude of major eruptions |
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| المؤلفون: | Mathilde Bablon, Gueorgui Ratzov, François Nauret, Pablo Samaniego, François Michaud, Marianne Saillard, Jean‐Noël Proust, Jean‐Luc Le Pennec, Jean‐Yves Collot, Jean‐Luc Devidal, François Orange, Céline Liorzou, Sébastien Migeon, Silvia Vallejo, Silvana Hidalgo, Patricia Mothes, Miguel Gonzalez |
| المساهمون: | Géoazur (GEOAZUR 7329), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA), Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement et la société-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Sorbonne Université (SU), Géosciences Rennes (GR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Geo-Ocean (GEO-OCEAN), Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD Indonésie), Institut de Recherche pour le Développement (IRD), CCMA - Centre Commun de Microscopie Appliquée, Université Côte d'Azur (UCA), Escuela Politécnica Nacional (EPN), Escuela Superior Politécnica del Litoral [Guayaquil] (ESPOL), Laboratoire Mixte International 'Séismes et 967Volcans dans les Andes du Nord' program, Region Sud-Provence-Alpes-Cote d'Azur, Observatoire de la Cote d'Azur, ARTEMIS Programs of CNRS-INSU, Universite Cote d'Azur (CSI), ANR-18-CE31-0022,MARACAS,Les terrasses marines comme proxy pour l'appréhension de l'aléa sismique(2018) |
| المصدر: | Geochemistry, Geophysics, Geosystems Geochemistry, Geophysics, Geosystems, 2022, 23 (9), pp.e2022GC010466. ⟨10.1029/2022GC010466⟩ Geochemistry Geophysics Geosystems (1525-2027) (American Geophysical Union (AGU)), 2022-09, Vol. 23, N. 9, P. e2022GC010466 (38p.) |
| بيانات النشر: | HAL CCSD, 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Ocean drilling, Volcanology, volcanology, Geophysics, Geochemistry, Major and Trace element geochemistry, Geochemistry and Petrology, Radiogenic isotope geochemistry, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology, land-sea correlation, Tephrochronology, Ecuador, Explosive volcanism, tephrochronology, Land-sea correlation, geochemistry |
| الوصف: | Tephra layers preserved in marine sediments are strong tools to study the frequency, magnitude and source of past major explosive eruptions. Thirty-seven volcanoes from the Ecuadorian and Colombian arc, in the northern Andes, experienced at least one eruption during the Holocene. The volcanic hazard is therefore particularly high for the populated areas of the Andes and in particular cases for the coastal region, and it is crucial to document such events to improve hazard assessment. The age and distribution of deposits from major Holocene eruptions have been studied in the Cordillera, but no descriptions of distal fallouts have been published. In this study we focused on 28 Holocene tephra layers recorded in marine sediment cores collected along the northern Ecuador - southern Colombia margin. New lithological, geochemical and isotope data together with 14C datings on foraminifers allow us to determine the age and volcanic source of marine tephra, and to propose a first land-sea correlation of distal tephra fallouts. We show that at least seven explosive eruptions from Guagua Pichincha, Atacazo-Ninahuilca, Cotopaxi, and Cerro Machín volcanoes left tephra deposits recorded in marine cores over 250 km away from their source. Volume estimates of emitted tephra range between 1.3 and 6.0 km3 for the 10th century Guagua Pichincha, ∼5 ka Atacazo-Ninahuilca, ∼6.7 and ∼7.9 ka Cotopaxi events, suggesting that they were eruptions of Volcanic Explosivity Index of 5. The distribution of these deposits also brings new constraints for a better evaluation of the volcanic hazard in Ecuador. Key Points We propose a first land-sea correlation of distal Holocene tephra off Ecuador based on 14C age and geochemical data Products from at least seven explosive Holocene eruptions in Ecuador and south Colombia reached the Pacific Ocean Volumes of tephra emitted by largest eruptions vary between 1.3 and 6.0 km3, suggesting they were VEI-5 eruptions Plain Language Summary During major explosive eruptions, large volumes of gases and tephra (lapilli and ash particles) are thrown into the atmosphere and can be spread by winds over hundreds of kilometers and more. Tephra fallouts can impact the population, infrastructures and climate. It is therefore essential to document the age and magnitude of past major eruptions to better assess the volcanic hazards. In this study we use the minerology, glass shard morphology, and the geochemical composition of tephra settled in marine sediments off Ecuador and Colombia to investigate their source. Thickness of tephra layers and radiocarbon ages performed on under- and over-lying marine fauna allow us to determine the age of the eruptions, whereas the distribution of tephra yields constraints on the volume of fallout deposits. We show that the largest explosive eruptions from Ecuadorian and Colombian volcanoes reached the Pacific Ocean with a recurrence rate of about 1.5 events per millennium over the past 8 kyr. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1525-2027 |
| DOI: | 10.1029/2022GC010466⟩ |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c80391d43590a8d5bd698ccd09ff6b0 https://hal-insu.archives-ouvertes.fr/insu-03776996/document |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....3c80391d43590a8d5bd698ccd09ff6b0 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15252027 |
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| DOI: | 10.1029/2022GC010466⟩ |