globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.08.002
Scopus记录号: 2-s2.0-85027495275
论文题名:
Climatic and Tectonic forcing on alluvial fans in the Southern Central Andes
作者: Terrizzano C.M.; García Morabito E.; Christl M.; Likerman J.; Tobal J.; Yamin M.; Zech R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 172
起始页码: 131
结束页码: 141
语种: 英语
英文关键词: 10Be surface exposure dating ; Alluvial fans ; Climate change ; Glacial chronology ; Quaternary ; Southern central andes
Scopus关键词: Arid regions ; Glacial geology ; Landforms ; Tectonics ; Alluvial fans ; Central Andes ; Glacial chronology ; Quaternary ; Surface exposure dating ; Climate change
英文摘要: Mountainous regions and their forelands commonly support a suite of landforms sensitive to climate change and tectonics. Alluvial fans in particular, are prominent geomorphological features in arid and semiarid regions which provide record for landscape, climate, and tectonic evolution. We applied 10Be surface exposure dating on moraines and associated fan terraces of the Ansilta range (31.6°S - 69.8°W) in the Southern Central Andes with the aim of comparing both chronologies and examining the nature of alluvial fan development. The alluvial fans yield minimum ages of 19 ± 1 (T1), 120 ± 9 (T2), 185 ± 9 (T3), 389 ± 22 (T4) and 768 ± 35 (T5) ka. Minimum ages derived from moraines are 18 ± 1 (M1), 27 ± 1 (M2), 279 ± 23 (M3) and 410 ± 28 (M4) ka. M1-T1 and M4-T4 seem to be geomorphic counterparts during MIS2 and MIS11-12. Combining our glacial and alluvial database with that available from other published studies, we recognized further glacial-alluvial counterparts. The distinct phases of alluvial fan aggradation mainly correlate with moraines or have a regional extension and fall into local cold and wet times, so that climate seems to be the main forcing of alluvial fan formation at our study site, even being a region with proofed neotectonic activity. We interpret the presence of at least six cold and humid periods of alluvial aggradation which correlate with global MIS 2, 3, 5d-e, 8, 12 and 18–20. Based on these results, alluvial fans may allow landscape and climate reconstructions back to ∼750 ka in our study region. © 2017 Elsevier Ltd
资助项目: We express our acknowledgment to an anonymous reviewer and editor Neil Glasser for the constructive, pertinent and helpful comments on the manuscript. Thanks also to Alejandro Beltrán-Triviño for his help with the probability density plots and to Marien Sorensen for her meaningful reading of the manuscript. This work was financially supported by the Swiss National Science Foundation – Marie Heim-Vögtlin Project 158368 funded to C.T.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59112
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作者单位: University of Bern, Institute of Geography and Oeschger Centre for Climate Change Research, Bern, Switzerland; Instituto de Estudios Andinos “Don Pablo Groeber” (IDEAN), University of Buenos Aires-CONICET, Argentina; Swiss Federal Institute of Technology in Zurich (ETHZ), Laboratory of Ion Beam Physics, Zurich, Switzerland; Servicio Geológico Minero Argentino, Buenos Aires, Argentina

Recommended Citation:
Terrizzano C.M.,García Morabito E.,Christl M.,et al. Climatic and Tectonic forcing on alluvial fans in the Southern Central Andes[J]. Quaternary Science Reviews,2017-01-01,172
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