DOI: 10.1016/j.quascirev.2013.11.008
Scopus记录号: 2-s2.0-84889568772
论文题名: The deglaciation history of the Simplon region (southern Swiss Alps) constrained by 10Be exposure dating of ice-molded bedrock surfaces
作者: Dielforder A. ; Hetzel R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 84 起始页码: 26
结束页码: 38
语种: 英语
英文关键词: Alpine Lateglacial
; Deglaciation
; Last Glacial Maximum
; Paleoclimate
; Swiss Alps
Scopus关键词: Domes
; Glacial geology
; Landforms
; Melting
; Quartz
; Deglaciations
; Last Glacial Maximum
; Lateglacial
; Paleoclimates
; Swiss Alps
; Ice
; Allerod
; altitude
; bedrock
; beryllium isotope
; Bolling
; dating method
; deglaciation
; ice retreat
; lacustrine deposit
; Last Glacial Maximum
; mountain region
; Older Dryas
; paleoclimate
; piedmont
; valley glacier
; Alps
; Simplon
; Switzerland
英文摘要: The deglaciation history of the Swiss Alps after the Last Glacial Maximum involved the decay of several ice domes and the subsequent disintegration of valley glaciers at high altitude. Here we use bedrock exposure dating to reconstruct the temporal and spatial pattern of ice retreat at the Simplon Pass (altitude: ~2000m) located 40km southwest of the 'RhÔne ice dome'. Eleven 10Be exposure ages from glacially polished quartz veins and ice-molded bedrock surfaces cluster tightly between 13.5±0.6ka and 15.4±0.6ka (internal errors) indicating that the Simplon Pass depression became ice-free at 14.1±0.4ka (external error of mean age). This age constraint is interpreted to record the melting of the high valley glaciers in the Simplon Pass region during the warm Bølling-Allerød interstadial shortly after the Oldest Dryas stadial. Two bedrock samples collected a few hundred meters above the pass depression yield older 10Be ages of 17.8±0.6ka and 18.0±0.6ka. These ages likely reflect the initial downwasting of the RhÔne ice dome and the termination of the ice transfluence from the ice dome across the Simplon Pass toward the southern foreland. There, the retreat of the piedmont glacier in Val d'Ossola was roughly synchronous with the decay of the RhÔne ice dome in the interior of the mountain belt, as shown by 10Be ages of 17.7±0.9ka and 16.1±0.6ka for a whaleback at ~500m elevation near Montecrestese in northern Italy. In combination with well-dated paleoclimate records derived from lake sediments, our new age data suggest that during the deglaciation of the European Alps the decay of ice domes was approximately synchronous with the retreat of piedmont glaciers in the foreland and was followed by the melting of high-altitude valley glaciers after the transition from the Oldest Dryas to the Bølling-Allerød, when mean annual temperatures rose rapidly by ~3°C. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60405
Appears in Collections: 过去全球变化的重建
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作者单位: Institut für Geologie und Paläontologie, Westfälische Wilhelms-Universität Münster, Corrensstraße 24, 48149 Münster, Germany
Recommended Citation:
Dielforder A.,Hetzel R.. The deglaciation history of the Simplon region (southern Swiss Alps) constrained by 10Be exposure dating of ice-molded bedrock surfaces[J]. Quaternary Science Reviews,2014-01-01,84