globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.03.023
Scopus记录号: 2-s2.0-85016724715
论文题名:
Regional mid-Pleistocene glaciation in central Patagonia
作者: Hein A.S.; Cogez A.; Darvill C.M.; Mendelova M.; Kaplan M.R.; Herman F.; Dunai T.J.; Norton K.; Xu S.; Christl M.; Rodés Á.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 164
起始页码: 77
结束页码: 94
语种: 英语
英文关键词: Beryllium-10 ; Cosmogenic nuclide surface exposure dating ; Glacial chronology ; Last Glacial Maximum ; Marine isotope stage 8 ; Moraine boulders ; Moraine degradation
Scopus关键词: Isotopes ; Landforms ; Cosmogenic nuclide surface-exposure dating ; Glacial chronology ; Last Glacial Maximum ; Marine isotope stages ; Moraine boulders ; Glacial geology
英文摘要: Southern South America contains a glacial geomorphological record that spans the past million years and has the potential to provide palaeoclimate information for several glacial periods in Earth's history. In central Patagonia, two major outlet glaciers of the former Patagonian Ice Sheet carved deep basins ∼50 km wide and extending over 100 km into the Andean plain east of the mountain front. A succession of nested glacial moraines offers the possibility of determining when the ice lobes advanced and whether such advances occurred synchronously. The existing chronology, which was obtained using different methods in each valley, indicates the penultimate moraines differ in age by a full glacial cycle. Here, we test this hypothesis further using a uniform methodology that combines cosmogenic nuclide ages from moraine boulders, moraine cobbles and outwash cobbles. 10Be concentrations in eighteen outwash cobbles from the Moreno outwash terrace in the Lago Buenos Aires valley yield surface exposure ages of 169–269 ka. We find 10Be inheritance is low and therefore use the oldest surface cobbles to date the deposit at 260–270 ka, which is indistinguishable from the age obtained in the neighbouring Lago Pueyrredón valley. This suggests a regionally significant glaciation during Marine Isotope Stage 8, and broad interhemispheric synchrony of glacial maxima during the mid to late Pleistocene. Finally, we find the dated outwash terrace is 70–100 ka older than the associated moraines. On the basis of geomorphological observations, we suggest this difference can be explained by exhumation of moraine boulders. © 2017 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59242
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作者单位: School of GeoSciences, University of Edinburgh, Drummond Street, Edinburgh, United Kingdom; Institute of Earth Surface Dynamics, University of Lausanne, Geopolis, Lausanne, Switzerland; Geography Program and Natural Resources and Environmental Studies Institute, University of Northern British Columbia, Prince George, Canada; Geochemistry, Lamont-Doherty Earth Observatory, Palisades, New York, United States; Institute for Geology and Mineralogy, University of Cologne, Cologne, Germany; School of Geography, Environment, and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand; Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, United Kingdom; Ion Beam Physics Laboratory, Swiss Federal Institute of Zürich, Zürich, Switzerland

Recommended Citation:
Hein A.S.,Cogez A.,Darvill C.M.,et al. Regional mid-Pleistocene glaciation in central Patagonia[J]. Quaternary Science Reviews,2017-01-01,164
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