Article (Scientific journals)
Lacustrine record of last millennia eruptions in Northern Chilean Patagonia (45–47°S)
Fagel, Nathalie; Alvarez, D.; Namur, Olivier et al.
2017In Holocene, 27 (8), p. 1227-1251
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Keywords :
Chile; Holocene; Hudson volcano; Southern Volcanic Zone; Lepidium meyenii
Abstract :
[en] Due to its tectonic setting, the Andean Southern Volcanism Zone (SSVZ) is characterized by frequent volcanic activity. Chilean Patagonia lake sediments represent powerful archives of historical and past eruptions since the deglaciation. The lacustrine tephra record is investigated in 10 Holocene sedimentary cores collected in five lakes located along a 45–47° transect through Northern Chilean Patagonia. All the tephras identified by visual observation and strong magnetic susceptibility signal have been characterized for the major chemical composition of their glass shards by microprobe analyses, bulk mineralogical content by x-ray diffraction analyses and grain-size distribution by laser diffraction. Special care has been given to the chronostratigraphical framework in order to determine the age interval for each tephra layer and further to correlate the lacustrine records. The sedimentary age models are based on 210Pb data and calibrated radiocarbon dates measured on macroremains or reservoir effect-corrected bulk sediment. To present a more complete tephrochronological record, 28 microtephras have been confirmed by their mineralogical signature. Our lacustrine tephra record is compared with the Holocene eruptions registered in both surface deposits and continental, lacustrine and peat bog, environments. The different lacustrine eruption records are discussed according to their origin, age and location (distance from volcanoes, wind direction and dispersion of eruption produced). Our data confirm that Chilean Ande SSVZ tephras are mainly derived from historical and past Hudson eruptions. However, the peculiar low-K2O signature of the glass shards observed in one tephra layer from the Northernmost lake, Lake Thompson, confirms an influence from some other SSVZ volcanoes with low-abundance magma type, such as Maca and Cay. Our tephrochronological data compliment the database for volcanic activity in Chile bringing new information essential for the running discussion on the temporal distribution of eruptions over the Holocene. © 2017, © The Author(s) 2017.
Research center :
UR Geology
Disciplines :
Earth sciences & physical geography
Author, co-author :
Fagel, Nathalie  ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Alvarez, D.;  Aquatic Systems Research Unit, Faculty of Environmental Sciences, Environmental Sciences Centre EULA-Chile, University of Concepcion, Chile, Faculty of Sciences, University Santo Tomás, Concepción, Chile, Water Research Center for Agriculture and Mining (CRHIAM), Chile
Namur, Olivier ;  Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique
Devidal, J.-L.;  Laboratoire Magmas et Volcans, Université Blaise Pascal-CNRS-IRD-OPGC, France
Nuttin, L.;  AGEs – Clays, Sedimentary Environments and Geochemistry, Department of Geology, University of Liege, Belgium
Schmidt, S.;  Laboratoire Environnements et Paléoenvironnements Océaniques et Continentaux UMR5805, Université de Bordeaux, France
Jana, P.;  Aquatic Systems Research Unit, Faculty of Environmental Sciences, Environmental Sciences Centre EULA-Chile, University of Concepcion, Chile
Torrejon, F.;  Aquatic Systems Research Unit, Faculty of Environmental Sciences, Environmental Sciences Centre EULA-Chile, University of Concepcion, Chile
Bertrand, S.;  Renard Center of Marine Geology, University of Ghent, Belgium
Araneda, A.;  Aquatic Systems Research Unit, Faculty of Environmental Sciences, Environmental Sciences Centre EULA-Chile, University of Concepcion, Chile
Urrutia, R.;  Aquatic Systems Research Unit, Faculty of Environmental Sciences, Environmental Sciences Centre EULA-Chile, University of Concepcion, Chile, Water Research Center for Agriculture and Mining (CRHIAM), Chile
Language :
English
Title :
Lacustrine record of last millennia eruptions in Northern Chilean Patagonia (45–47°S)
Publication date :
2017
Journal title :
Holocene
ISSN :
0959-6836
eISSN :
1477-0911
Publisher :
SAGE Publications Ltd
Volume :
27
Issue :
8
Pages :
1227-1251
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
CRHIAM/CONICYT/FONDAP/15130015 (Chilean project); FONDECYT no. 1140466 (Chilean project); FNRS proposal 1360 2007–2010; WBI 2007–2009; ULg CFRA 1060 2009–2011
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
FONDECYT - Chile Fondo Nacional de Desarrollo Científico y Tecnológico [CL]
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