DOI: 10.1016/j.quascirev.2016.02.015
Scopus记录号: 2-s2.0-84960406728
论文题名: Synchronisation of sedimentary records using tephra: A postglacial tephrochronological model for the Chilean Lake District
作者: Fontijn K. ; Rawson H. ; Van Daele M. ; Moernaut J. ; Abarzúa A.M. ; Heirman K. ; Bertrand S. ; Pyle D.M. ; Mather T.A. ; De Batist M. ; Naranjo J.-A. ; Moreno H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 137 起始页码: 234
结束页码: 254
语种: 英语
英文关键词: Eruptive history
; Lake District
; Patagonia
; Postglacial
; Southern Volcanic Zone
; Tephrochronology
Scopus关键词: Deposits
; Explosives
; Lakes
; Volcanoes
; Eruptive history
; Patagonia
; Postglacial
; Tephrochronology
; Volcanic zone
; Sedimentology
; geological record
; historical record
; lacustrine deposit
; Postglacial
; reconstruction
; sedimentary rock
; synchrony
; tephra
; tephrochronology
; volcanic eruption
; Araucania
; Argentina
; Calbuco Volcano
; Chile
; Cumbria
; England
; Lake District
; Llaima
; Los Lagos
; Los Rios [Chile]
; Patagonia
; Puyehue-Cordon Caulle
; Southern Volcanic Zone
; United Kingdom
英文摘要: Well-characterised tephra horizons deposited in various sedimentary environments provide a means of synchronising sedimentary archives. The use of tephra as a chronological tool is however still widely underutilised in southern Chile and Argentina. In this study we develop a postglacial tephrochronological model for the Chilean Lake District (ca. 38 to 42°S) by integrating terrestrial and lacustrine records. Tephra deposits preserved in lake sediments record discrete events even if they do not correspond to primary fallout. By combining terrestrial with lacustrine records we obtain the most complete tephrostratigraphic record for the area to date. We present glass geochemical and chronological data for key marker horizons that may be used to synchronise sedimentary archives used for palaeoenvironmental, palaeoclimatological and palaeoseismological purposes. Most volcanoes in the studied segment of the Southern Volcanic Zone, between Llaima and Calbuco, have produced at least one regional marker deposit resulting from a large explosive eruption (magnitude ≥ 4), some of which now have a significantly improved age estimate (e.g., the 10.5 ka Llaima Pumice eruption from Llaima volcano). Others, including several units from Puyehue-Cordón Caulle, are newly described here. We also find tephra related to the Cha1 eruption from Chaitén volcano in lake sediments up to 400 km north from source. Several clear marker horizons are now identified that should help refine age model reconstructions for various sedimentary archives. Our chronological model suggests three distinct phases of eruptive activity impacting the area, with an early-to-mid-Holocene period of relative quiescence. Extending our tephrochronological framework further south into Patagonia will allow a more detailed evaluation of the controls on the occurrence and magnitude of explosive eruptions throughout the postglacial. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59639
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, University of Oxford, United Kingdom; Department of Geology, Ghent University, Belgium; Instituto de Ciencias de la Tierra, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile; Geological Institute, ETH Zürich, Switzerland; Geological Survey of Denmark and Greenland, Department of Geophysics, Øster Voldgade 10, Copenhagen K, Denmark; SERNAGEOMIN, Santiago, Chile; OVDAS - SERNAGEOMIN, Temuco, Chile
Recommended Citation:
Fontijn K.,Rawson H.,Van Daele M.,et al. Synchronisation of sedimentary records using tephra: A postglacial tephrochronological model for the Chilean Lake District[J]. Quaternary Science Reviews,2016-01-01,137