Lacustrine record of last millennia eruptions in Northern Chilean Patagonia (45-47 degrees S)
| Autor: | Roberto Urrutia, Jean-Luc Devidal, Patricia Jana, Nathalie Fagel, Sebastien Bertrand, Alberto Araneda, Olivier Namur, Fernando Torrejón, Laurence Nuttin, Sabine Schmidt, Denisse Alvarez |
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| Přispěvatelé: | Unité de Recherche Argiles et Paléoclimats, Université de Liège, Département de Géologie, Laboratoire Magmas et Volcans (LMV), Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche en géochimie et géodynamique (GEOTOP ), Université du Québec à Montréal = University of Québec in Montréal (UQAM), Environnements et Paléoenvironnements OCéaniques (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Universidad de Concepción - University of Concepcion [Chile], Clays and Paleoclimate Research Unit, EULA, Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Universidad de Concepción [Chile] |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Archeology
010504 meteorology & atmospheric sciences Geochemistry [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography Volcanism Biogenic silica 010502 geochemistry & geophysics 01 natural sciences Ice age Geomorphology Holocene ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Earth-Surface Processes Global and Planetary Change geography geography.geographical_feature_category Explosive eruption Ecology Lepidium meyenii Paleontology 15. Life on land Tectonics Volcano 13. Climate action Geology |
| Zdroj: | Holocene Artículos CONICYT CONICYT Chile instacron:CONICYT The Holocene The Holocene, 2017, 27 (8), pp.1227-1251. ⟨10.1177/0959683616687380⟩ The Holocene, London: Sage, 2017, 27 (8), pp.1227-1251. ⟨10.1177/0959683616687380⟩ |
| ISSN: | 0959-6836 1477-0911 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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