globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.06.030
论文题名:
Late Holocene hydrology inferred from lacustrine sediments of Laguna Cha´ltel (southeastern Argentina)
作者: Ohlendorf C.; Fey M.; Massaferro J.; Haberzettl T.; Laprida C.; Lu¨cke A.; Maidana N.; Mayr C.; Oehlerich M.; Ramo´n Mercau J.; Wille M.; Corbella H.; St-Onge G.; Scha¨bitz F.; Zolitschka B.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 411
起始页码: 229
结束页码: 248
语种: 英语
英文关键词: Bioproxies ; Lacustrine ooids and pseudomorphs after ikaite ; Lake-level changes ; Multiple dating ; Southern hemisphere westerly winds ; XRF-scanning
英文摘要: Hydrological changes that occurred during the last 4700years have been reconstructed using multi-proxy analyses of sediment cores from the volcanic crater lake of Laguna Cha´ltel (50°S, 71°W). The chronology is based on AMS 14C age modeling constrained by paleomagnetic secular variations. Chemical and physical properties of the lake water together with results of lake-water surface-temperature monitoring, as well as sediment characteristics reveal conspicuous features archived as different sedimentary carbonate phases and morphologies which are attributed to lake-level changes.Sedimentological, geochemical and biological proxies together suggest the development from an initial playa lake-phase towards a system with progressively rising lake level. In detail, proxies indicate the existence of an ephemeral lake since 4700. cal BP until a glauberite-bearing carbonate crust formed around 4040. cal BP which probably is associated to the globally recognized 4.2. ka event. This crust is interpreted as a desiccation event terminating the ephemeral lake phase. Following this desiccation a shift towards conditions with a positive hydrological balance of Laguna Cha´ltel occurs, which leads to the development of a saline lake with ooid formation between 4040 and 3200. cal BP. Further lake-level increase with initially high minerogenic input until 2700. cal BP resulted in a lake freshening which allowed the preservation of diatoms. Sigmoidal and star shaped carbonate crystals occurred until 1720. cal BP indicating a syn- or post-depositional formation of ikaite. Anoxic conditions and increased deposition of clay and sand through fluvial and eolian input are interpreted as a further lake-level rise and/or a prolonged winter ice cover culminating during the Little Ice Age. The highest lake level was probably reached at that time and since then dropped to its present day height.Previous studies have shown that the southern hemisphere westerly winds (SWW) exert an oppositional control on hydrological regimes at the eastern and the western sides of the Patagonian Andes. At Laguna Cha´ltel SWW forcing is changing evaporation rates by varying wind intensities, air temperatures and lake ice coverages as well as by precipitation rates (easterly vs. westerly sources of moisture). Our data suggests that the lake-level history of Laguna Cha´ltel reflects changes in the SWW during the last 4.7. ka on the eastern side of the Andes. However, the elevated location of Laguna Cha´ltel on an 800. m high plateau at the leeward side of the Andes potentially leads to a local overprint of the SWW influence on the hydrological balance. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69241
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作者单位: GEOPOLAR, Institute of Geography, University of Bremen, Celsiusstr. FVG-M, Bremen, Germany; CONICET, CENAC/APN, Fagnano 244, Bariloche, Argentina; Physical Geography, Institute of Geography, University of Jena, Lo¨bdergraben 32, Jena, Germany; Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina; Institute of Bio- and Geosciences, IBG-3: Agrosphere, Research Center Ju¨lich, Ju¨lich, Germany; Institute of Geography, University of Erlangen-Nu¨rnberg, Kochstr. 4/4, Erlangen, Germany; Department of Earth and Environmental Sciences, University of Munich, Richard-Wagner-Str. 10, Munich, Germany; GeoBio-Center, University of Munich, Richard-Wagner-Str. 10, Munich, Germany; Seminar fu¨r Geographie und ihre Didaktik, University of Cologne, Gronewaldstr. 2, Cologne, Germany; Argentine Museum of Natural History, Av. Angel Gallardo 470, Buenos Aires, Argentina; Canada Research Chair in Marine Geology, Institut des sciences de la mer de Rimouski (ISMER), UQAR, Rimouski, QC, Canada; GEOTOP Research Center, Montre´al, QC, Canada

Recommended Citation:
Ohlendorf C.,Fey M.,Massaferro J.,et al. Late Holocene hydrology inferred from lacustrine sediments of Laguna Cha´ltel (southeastern Argentina)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,411
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