globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2012.06.003
Scopus记录号: 2-s2.0-84878924540
论文题名:
Microsedimentological characterization using image analysis and μ-XRF as indicators of sedimentary processes and climate changes during Lateglacial at Laguna Potrok Aike, Santa Cruz, Argentina
作者: Jouve G.; Francus P.; Lamoureux S.; Provencher-Nolet L.; Hahn A.; Haberzettl T.; Fortin D.; Nuttin L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 71
起始页码: 191
结束页码: 204
语种: 英语
英文关键词: Granulometry ; Image analysis ; Micropumices ; Paleoclimate ; Sedimentary processes ; XRF
Scopus关键词: Granulometries ; Micropumices ; Paleoclimates ; Sedimentary process ; XRF ; Glacial geology ; Image analysis ; Manganese ; Scanning electron microscopy ; Sedimentology ; Surface waters ; Climate change ; climate change ; climate conditions ; granulometry ; green alga ; heavy metal ; high temperature ; image analysis ; lacustrine deposit ; late glacial ; paleoclimate ; paleoenvironment ; resolution ; sedimentology ; Southern Hemisphere ; Argentina ; Laguna Potrok Aike ; Santa Cruz [Argentina] ; Chlorophyta ; Phacotus lenticularis
英文摘要: Palaeoclimatic and paleoenvironmental high latitude records in the Southern Hemisphere are scarce compared to the northern counterpart. However, understanding global evolution of environmental systems during sudden climate changes is inseparable from an equivalent knowledge of both Hemispheres. In this context, a high-resolution study of lacustrine sediments from Laguna Potrok Aike, Santa Cruz province, Patagonia, Argentina, was conducted for the Lateglacial period using concurrent X-Ray Fluorescence (XRF) and Scanning electron microscope analyses. Peaks of Ca/Si and Mn, and occurrences of the green alga Phacotus lenticularis have been interpreted as variations in ventilation of the water column from 13.6 to 11.1kacal.BP. During this interval, mild climate conditions during the Younger Dryas are characterized by relatively weak westerlies favouring the formation of a stratified water body as indicated by preserved manganese and Ca/Si peaks and high Total Organic Carbon (TOC) values. In this environment, water in the epilimnion can reach sufficiently high temperature to allow P.lenticularis to grow. Colder conditions are marked by peaks in Ca without P.lenticularis and occur during the Antarctic Cold Reversal (ACR). In this Lateglacial interval, micropumices were also detected in large amount. Image analysis of thin sections allowed the counting and size measurement of detrital particles and micropumices separately. Micropumices significantly influence the iron and titanium content, hence preventing to use them as proxies of detrital input in this interval. © 2012 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60623
Appears in Collections:过去全球变化的重建

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作者单位: Centre Eau, Terre et Environnement, Institut National de la Recherche Scientifique, Québec, QC G1K 9A9, Canada; GEOTOP Research Center, Montréal, QC H3C 3P8, Canada; Department of Geography, Queen's University, Kingston, ON K7L 3N6, Canada; Geomorphology and Polar Research (GEOPOLAR), Institute of Geography, University of Bremen, Celsiusstr. FVG-M, D-28359 Bremen, Germany; Physical Geography, Institute of Geography, Friedrich-Schiller University Jena, Löbdergraben 32, D-07743 Jena, Germany

Recommended Citation:
Jouve G.,Francus P.,Lamoureux S.,et al. Microsedimentological characterization using image analysis and μ-XRF as indicators of sedimentary processes and climate changes during Lateglacial at Laguna Potrok Aike, Santa Cruz, Argentina[J]. Quaternary Science Reviews,2013-01-01,71
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