Late Holocene tephrostratigraphy from Cajas National Park, southern Ecuador

ABSTRACT Lakes located downwind of active volcanoes serve as a natural repository for volcanic ash (tephra) produced during eruptive events. In this study, sediment cores from four lakes in Cajas National Park, southern Ecuador, situated approximately 200 km downwind of active volcanoes in the North...

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Autores principales:	Arcusa,Stéphanie H., Schneider,Tobias, Mosquera,Pablo V., Vogel,Hendrik, Kaufman,Darrell, Szidat,Sönke, Grosjean,Martin
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2020
Materias:	Tephra Taphonomy Tephra morphology Radiocarbon 14C chronology Limnogeology Andes South America
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062020000300508
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spelling	oai:scielo:S0718-710620200003005082020-10-14Late Holocene tephrostratigraphy from Cajas National Park, southern EcuadorArcusa,Stéphanie H.Schneider,TobiasMosquera,Pablo V.Vogel,HendrikKaufman,DarrellSzidat,SönkeGrosjean,Martin Tephra Taphonomy Tephra morphology Radiocarbon 14C chronology Limnogeology Andes South America ABSTRACT Lakes located downwind of active volcanoes serve as a natural repository for volcanic ash (tephra) produced during eruptive events. In this study, sediment cores from four lakes in Cajas National Park, southern Ecuador, situated approximately 200 km downwind of active volcanoes in the Northern Andes Volcanic Zone, were analysed to document the regional history of tephra fall extending back around 3,000 a cal BP. The ages of the lacustrine sedimentary sequences were constrained using a total of 20 AMS radiocarbon ages on plant remains. The tephra layers were correlated among the lakes based on their radiocarbon age, elemental composition, colour, and grain morphology. We found five unique tephra layers, each at least 0.2 cm thick, and further constrained their ages by combining the results from two age-depth modelling approaches (clam and rbacon). The tephra layers were deposited 3,034±621, 2,027±41, 1,557±177, 733±112, and 450±70 a cal BP. The ages of all but the youngest tephra layer overlap with those of known eruptions from Tungurahua. Some tephra layers are missing as macroscopic layers in several cores, with only two of the five tephra layers visible in the sediment of three lakes. Likewise, previous studies of lake sediment cores from the region are missing the four youngest tephra layers, further highlighting the need to sample multiple lakes to reconstruct a comprehensive history of fallout events. The newly documented stratigraphic marker layers will benefit future studies of lake sediments in Cajas National Park.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.47 n.3 20202020-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062020000300508en10.5027/andgeov47n3-3301
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Tephra Taphonomy Tephra morphology Radiocarbon 14C chronology Limnogeology Andes South America
spellingShingle	Tephra Taphonomy Tephra morphology Radiocarbon 14C chronology Limnogeology Andes South America Arcusa,Stéphanie H. Schneider,Tobias Mosquera,Pablo V. Vogel,Hendrik Kaufman,Darrell Szidat,Sönke Grosjean,Martin Late Holocene tephrostratigraphy from Cajas National Park, southern Ecuador
description	ABSTRACT Lakes located downwind of active volcanoes serve as a natural repository for volcanic ash (tephra) produced during eruptive events. In this study, sediment cores from four lakes in Cajas National Park, southern Ecuador, situated approximately 200 km downwind of active volcanoes in the Northern Andes Volcanic Zone, were analysed to document the regional history of tephra fall extending back around 3,000 a cal BP. The ages of the lacustrine sedimentary sequences were constrained using a total of 20 AMS radiocarbon ages on plant remains. The tephra layers were correlated among the lakes based on their radiocarbon age, elemental composition, colour, and grain morphology. We found five unique tephra layers, each at least 0.2 cm thick, and further constrained their ages by combining the results from two age-depth modelling approaches (clam and rbacon). The tephra layers were deposited 3,034±621, 2,027±41, 1,557±177, 733±112, and 450±70 a cal BP. The ages of all but the youngest tephra layer overlap with those of known eruptions from Tungurahua. Some tephra layers are missing as macroscopic layers in several cores, with only two of the five tephra layers visible in the sediment of three lakes. Likewise, previous studies of lake sediment cores from the region are missing the four youngest tephra layers, further highlighting the need to sample multiple lakes to reconstruct a comprehensive history of fallout events. The newly documented stratigraphic marker layers will benefit future studies of lake sediments in Cajas National Park.
author	Arcusa,Stéphanie H. Schneider,Tobias Mosquera,Pablo V. Vogel,Hendrik Kaufman,Darrell Szidat,Sönke Grosjean,Martin
author_facet	Arcusa,Stéphanie H. Schneider,Tobias Mosquera,Pablo V. Vogel,Hendrik Kaufman,Darrell Szidat,Sönke Grosjean,Martin
author_sort	Arcusa,Stéphanie H.
title	Late Holocene tephrostratigraphy from Cajas National Park, southern Ecuador
title_short	Late Holocene tephrostratigraphy from Cajas National Park, southern Ecuador
title_full	Late Holocene tephrostratigraphy from Cajas National Park, southern Ecuador
title_fullStr	Late Holocene tephrostratigraphy from Cajas National Park, southern Ecuador
title_full_unstemmed	Late Holocene tephrostratigraphy from Cajas National Park, southern Ecuador
title_sort	late holocene tephrostratigraphy from cajas national park, southern ecuador
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062020000300508
work_keys_str_mv	AT arcusastephanieh lateholocenetephrostratigraphyfromcajasnationalparksouthernecuador AT schneidertobias lateholocenetephrostratigraphyfromcajasnationalparksouthernecuador AT mosquerapablov lateholocenetephrostratigraphyfromcajasnationalparksouthernecuador AT vogelhendrik lateholocenetephrostratigraphyfromcajasnationalparksouthernecuador AT kaufmandarrell lateholocenetephrostratigraphyfromcajasnationalparksouthernecuador AT szidatsonke lateholocenetephrostratigraphyfromcajasnationalparksouthernecuador AT grosjeanmartin lateholocenetephrostratigraphyfromcajasnationalparksouthernecuador
_version_	1714205868705185792

Late Holocene tephrostratigraphy from Cajas National Park, southern Ecuador

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