DOI: 10.1016/j.quascirev.2015.09.022
Scopus记录号: 2-s2.0-84943657028
论文题名: Late pleistocene glaciations of the arid subtropical Andes and new results from the Chajnantor Plateau, northern Chile
作者: Ward D.J. ; Cesta J.M. ; Galewsky J. ; Sagredo E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 128 起始页码: 98
结束页码: 116
语种: 英语
英文关键词: Altiplano
; Arid Andes
; Cosmogenic dating
; Glacial deposits
; Last glacial maximum
; Paleoclimatology
Scopus关键词: Moisture
; Altiplano
; Arid Andes
; Cosmogenic dating
; Glacial deposits
; Last Glacial Maximum
; Paleoclimatology
; Glacial geology
英文摘要: The spatiotemporal pattern of glaciation along the Andes Mountains is an important proxy record reflecting the varying influence of global and regional circulation features on South American climate. However, the timing and extent of glaciation in key parts of the orogen, particularly the deglaciated arid Andes, are poorly constrained. We present new cosmogenic 10Be and 36Cl exposure ages for glacial features on and near the Chajnantor Plateau (23 °S). The new dates, although scattered due to cosmogenic inheritance, imply that the most recent extensive glacial occupation ended before or during the global Last Glacial Maximum (LGM). We discuss this new record in the context of published glacial chronologies from glacial features in Peru, Bolivia, and northern Chile rescaled using the latest cosmogenic 10Be production rate calibration for the tropical Andes. The results imply regionally synchronous moraine stabilization ca. 25-40 ka, 15-17 ka, and 12-14 ka, with the youngest of these moraines absent in records south of ~20 °S, including in our new Chajnantor area chronology. This spatial pattern implicates easterly moisture in generating sufficient snowfall to glaciate the driest parts of the Andes, while allowing a role for westerly moisture, possibly modulated by the migration of the Southern Westerly Wind belt, in the regions near and south of the Atacama Desert. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59793
Appears in Collections: 过去全球变化的重建
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作者单位: University of Cincinnati, Dept. of Geology, Cincinnati, OH, United States; University of New Mexico, Dept. of Earth and Planetary Sciences, Albuquerque, NM, United States; Pontificia Universidad Católica de Chile, Santiago, Chile; Millennium Nucleus PaleoClimate, Chile
Recommended Citation:
Ward D.J.,Cesta J.M.,Galewsky J.,et al. Late pleistocene glaciations of the arid subtropical Andes and new results from the Chajnantor Plateau, northern Chile[J]. Quaternary Science Reviews,2015-01-01,128