globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.06.034
论文题名:
Chronological and geomorphological investigation of fossil debris-covered glaciers in relation to deglaciation processes: A case study in the Sierra de La Demanda, northern Spain
作者: Aumaître G.; Bourlès D.; Keddadouche K.; Schimmelpfennig I.; Léanni L.; Fernández-Fernández J.M.; Palacios D.; Andrés N.; Úbeda J.; García-Ruiz J.M.; Gómez-Villar A.; Santos-González J.; Álvarez-Martínez J.; Arnáez J.
刊名: Quaternary Science Reviews
出版年: 2017
卷: 170
起始页码: 232
结束页码: 249
语种: 英语
英文关键词: Cosmogenic exposure dating ; Debris-covered glacier ; Oldest dryas ; Sierra de la Demanda
Scopus关键词: Glacial geology ; Ice ; Cosmogenic exposure ; Debris covered glaciers ; Glacial valleys ; Holocene thermal maximums ; Last Glacial Maximum ; Oldest Dryas ; Sierra de la Demanda ; Surface exposure dating ; Debris
英文摘要: In this study, fossil debris-covered glaciers are investigated and dated in the Sierra de la Demanda, northern Spain. They are located in glacial valleys of approximately 1 km in length, where several moraines represent distinct phases of the deglaciation period. Several boulders in the moraines and fossil debris-covered glaciers were selected for analysis of 10Be surface exposure dating. A minimum age of 17.8 ± 2.2 ka was obtained for the outermost moraine in the San Lorenzo cirque, and was attributed to the global Last Glacial Maximum (LGM) or earlier glacial stages, based on deglaciation dates determined in other mountain areas of northern Spain. The youngest moraines were dated to approximately 16.7 ± 1.4 ka, and hence correspond to the GS-2a stadial (Oldest Dryas). Given that the debris-covered glaciers fossilize intermediate moraines, it was deduced that they developed between the LGM and the Oldest Dryas, coinciding with a period of extensive deglaciation. During this deglaciation phase, the cirque headwalls likely discharged large quantities of boulders and blocks that covered the residual ice masses. The resulting debris-covered glaciers evolved slowly because the debris mantle preserved the ice core from rapid ablation, and consequently they remained active until the end of the Late Glacial or the beginning of the Holocene (for the San Lorenzo cirque) and the Holocene Thermal Maximum (for the Mencilla cirque). The north-facing part of the Mencilla cirque ensured longer preservation of the ice core. © 2017 Elsevier Ltd
资助项目: Fernández-Fernández, J.M. ; Research Group of High Mountain Physical Geography, Department of Geography, Universidad Complutense de MadridSpain ; 电子邮件: josemariafernandez@ucm.es
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59157
Appears in Collections:过去全球变化的重建

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作者单位: Aix-Marseille Université, CNRS, IRD, Coll. France, UM 34 CEREGE, Technopôle de l'Environnement Arbois-Méditerranée, BP 80, Aix-en-Provence, France; Research Group of High Mountain Physical Geography, Department of Geography, Universidad Complutense de Madrid, Madrid, Spain; Instituto Pirenaico de Ecología, Consejo Superior de Investigaciones Científicas (IPE-CSIC), Campus de Aula Dei, P.O. Box 13034, Zaragoza, Spain; Department of Geography and Geology, Universidad de León, Campus de Vegazana, León, Spain; Department of Agricultural and Forest Engineering, Universidad de Valladolid, Campus La Yutera, Palencia, Spain; Area of Physical Geography, Department of Human and Social Sciences, Universidad de La Rioja, Logroño, Spain

Recommended Citation:
Aumaître G.,Bourlès D.,Keddadouche K.,et al. Chronological and geomorphological investigation of fossil debris-covered glaciers in relation to deglaciation processes: A case study in the Sierra de La Demanda, northern Spain[J]. Quaternary Science Reviews,2017-01-01,170
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