Holocene tephrochronology of the lower Río Cisnes valley, southern Chile

ABSTRACT Sediment cores from lakes and bogs in the Río Cisnes valley contain tephra from explosive eruptions of volcanoes in the southern part of the Andean Southern Volcanic Zone (SSVZ). These tephra, which thicken and coarsen to the west, are attributed to eruptions from Melimoyu, Mentolat, Hudson...

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Autores principales:	Weller,Derek J., de Porras,María Eugenia, Maldonado,Antonio, Méndez,César, Stern,Charles R.
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2017
Materias:	Andean volcanism Tephra Tephrochronology Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062017000300229
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spelling	oai:scielo:S0718-710620170003002292017-10-16Holocene tephrochronology of the lower Río Cisnes valley, southern ChileWeller,Derek J.de Porras,María EugeniaMaldonado,AntonioMéndez,CésarStern,Charles R. Andean volcanism Tephra Tephrochronology Chile ABSTRACT Sediment cores from lakes and bogs in the Río Cisnes valley contain tephra from explosive eruptions of volcanoes in the southern part of the Andean Southern Volcanic Zone (SSVZ). These tephra, which thicken and coarsen to the west, are attributed to eruptions from Melimoyu, Mentolat, Hudson, and potentially either Macá, Cay or one of the many minor eruptive centers (MEC) located both along the Liquiñe-Ofqui Fault Zone (LOFZ) and surrounding the major volcanoes. Correlation of the tephra between two new cores in the lower Río Cisnes valley, and amongst other cores previously described from the region, and source volcano identification for the tephra, has been done using lithostratigraphic data (tephra layer thickness and grain size), petrography (tephra glass color, vesicle morphology, and type and abundance of phenocryst phases), and by comparison of bulk tephra trace-element characteristics with previously published whole-rock and bulk tephra chemical analysis. Four tephras in these cores are attributed to eruptions of Mentolat, four to eruptions from Melimoyu, one possibly to Hudson, and six cannot be assigned to a specific source volcano. Some of these tephra correspond to pyroclastic tephra fall deposits previously observed in outcrop, including the MEL2 eruption of Melimoyu and the MEN1 eruption of Mentolat. However, others have not been previously observed and represent the products of newly identified small to medium sized eruptions from volcanoes of the SSVZ. These results provide new information concerning the frequency and magnitude of explosive eruption of SSVZ volcanoes and contribute to the evaluation of volcanic hazards in the region.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.44 n.3 20172017-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062017000300229en10.5027/andgeov44n3-a01
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Andean volcanism Tephra Tephrochronology Chile
spellingShingle	Andean volcanism Tephra Tephrochronology Chile Weller,Derek J. de Porras,María Eugenia Maldonado,Antonio Méndez,César Stern,Charles R. Holocene tephrochronology of the lower Río Cisnes valley, southern Chile
description	ABSTRACT Sediment cores from lakes and bogs in the Río Cisnes valley contain tephra from explosive eruptions of volcanoes in the southern part of the Andean Southern Volcanic Zone (SSVZ). These tephra, which thicken and coarsen to the west, are attributed to eruptions from Melimoyu, Mentolat, Hudson, and potentially either Macá, Cay or one of the many minor eruptive centers (MEC) located both along the Liquiñe-Ofqui Fault Zone (LOFZ) and surrounding the major volcanoes. Correlation of the tephra between two new cores in the lower Río Cisnes valley, and amongst other cores previously described from the region, and source volcano identification for the tephra, has been done using lithostratigraphic data (tephra layer thickness and grain size), petrography (tephra glass color, vesicle morphology, and type and abundance of phenocryst phases), and by comparison of bulk tephra trace-element characteristics with previously published whole-rock and bulk tephra chemical analysis. Four tephras in these cores are attributed to eruptions of Mentolat, four to eruptions from Melimoyu, one possibly to Hudson, and six cannot be assigned to a specific source volcano. Some of these tephra correspond to pyroclastic tephra fall deposits previously observed in outcrop, including the MEL2 eruption of Melimoyu and the MEN1 eruption of Mentolat. However, others have not been previously observed and represent the products of newly identified small to medium sized eruptions from volcanoes of the SSVZ. These results provide new information concerning the frequency and magnitude of explosive eruption of SSVZ volcanoes and contribute to the evaluation of volcanic hazards in the region.
author	Weller,Derek J. de Porras,María Eugenia Maldonado,Antonio Méndez,César Stern,Charles R.
author_facet	Weller,Derek J. de Porras,María Eugenia Maldonado,Antonio Méndez,César Stern,Charles R.
author_sort	Weller,Derek J.
title	Holocene tephrochronology of the lower Río Cisnes valley, southern Chile
title_short	Holocene tephrochronology of the lower Río Cisnes valley, southern Chile
title_full	Holocene tephrochronology of the lower Río Cisnes valley, southern Chile
title_fullStr	Holocene tephrochronology of the lower Río Cisnes valley, southern Chile
title_full_unstemmed	Holocene tephrochronology of the lower Río Cisnes valley, southern Chile
title_sort	holocene tephrochronology of the lower río cisnes valley, southern chile
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2017
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062017000300229
work_keys_str_mv	AT wellerderekj holocenetephrochronologyofthelowerriocisnesvalleysouthernchile AT deporrasmariaeugenia holocenetephrochronologyofthelowerriocisnesvalleysouthernchile AT maldonadoantonio holocenetephrochronologyofthelowerriocisnesvalleysouthernchile AT mendezcesar holocenetephrochronologyofthelowerriocisnesvalleysouthernchile AT sterncharlesr holocenetephrochronologyofthelowerriocisnesvalleysouthernchile
_version_	1714205855369396224

Holocene tephrochronology of the lower Río Cisnes valley, southern Chile

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