DOI: 10.1016/j.quascirev.2016.02.027
Scopus记录号: 2-s2.0-84959454466
论文题名: Chronology of glaciations in the Cantabrian Mountains (NW Iberia) during the Last Glacial Cycle based on in situ-produced 10Be
作者: Rodríguez-Rodríguez L. ; Jiménez-Sánchez M. ; Domínguez-Cuesta M.J. ; Rinterknecht V. ; Pallàs R. ; Bourlès D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 138 起始页码: 31
结束页码: 48
语种: 英语
英文关键词: 10Be exposure dating
; Cantabrian mountains
; Glacier reconstruction
; Iberian peninsula
; Last deglaciation
; Last glacial cycle
; Paleoclimate
Scopus关键词: Cosmic rays
; Cosmology
; Landforms
; <sup>10</sup>Be exposure dating
; Cantabrian mountains
; Glacier reconstruction
; Iberian Peninsula
; Last deglaciation
; Last glacial cycles
; Paleoclimates
; Glacial geology
; beryllium isotope
; chronology
; erratic
; geological record
; glaciation
; in situ measurement
; last deglaciation
; Last Glacial
; luminescence dating
; moraine
; paleoclimate
; periglacial environment
; reconstruction
; rock glacier
; stagnation flow
; Atlantic Ocean
; Atlantic Ocean (North)
; Cantabrian Mountains
; Iberian Peninsula
; Pyrenees
; Sistema Central
; Spain
英文摘要: The mountain ranges of the Iberian Peninsula preserve a valuable record of past glaciations that may help reconstruct past atmospheric circulation patterns in response to cooling events in the North Atlantic Ocean. Available chronologies for the glacial record of the Cantabrian Mountains, which are mainly based on radiocarbon and luminescence dating of glacial-related sediments, suggest that glaciers recorded their Glacial Maximum (GM) during MIS 3 and experienced a later Last Glacial Maximum (LGM) advance. This LGM extent is not established yet, preventing a fair correlation with available Cosmic Ray Exposure (CRE) based chronologies for the glacial record of the Pyrenees and the Sistema Central.We present a glacial reconstruction and a 10Be CRE chronology for the Porma valley, in the southern slope of the central Cantabrian Mountains. Glacial evidence at the lowest altitudes correspond to erratic boulders and composite moraines whose minimum 10Be CRE age of 113.9 ± 7.1 ka suggests that glaciers were at their maximum extent during MIS 5d, most likely in response to the minima in summertime insolation of the Last Glacial Cycle. Recessional moraines preserved within the glacial maximum limits allow the assessment of subsequent glacier advances or stagnations. The most remarkable advance took place prior to 55.7 ± 4.0 ka (probably at the end of MIS 4), consistently with minimum radiocarbon ages previously reported for lacustrine glacial-related deposits in the Cantabrian Mountains. A limited number of 10Be CRE ages from a composite moraine suggest a possible advance of the Porma glacier coeval with the global LGM; the glacier front attributed to the LGM would be placed within the margins of the previous GM like in the western Pyrenees. Erratic boulders perched on an ice-moulded bedrock surface provided a mean 10Be CRE age of 17.7 ± 1.0 ka, suggesting that part of the recessional moraine sequence corresponds to minor advances or stagnations of the glacier fronts during the Lateglacial period. This recessional response is consistent with deglacial chronologies previously established in the Pyrenees and the Sistema Central, and correlates with the coldest and driest conditions of MIS 2 according to lacustrine records. Finally, a relict rock glacier provided a mean 10Be CRE age of 15.7 ± 0.8 ka for movement cessation of its toe, indicating that periglacial conditions prevailed, at least, until the end of Heinrich Stadial 1/Mystery Interval. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59635
Appears in Collections: 过去全球变化的重建
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作者单位: Dpto. Geología, Universidad de Oviedo, Arias de Velasco s/n, Oviedo, Spain; Université Paris 1 Panthéon-Sorbonne, CNRS Laboratoire de Géographie Physique, Meudon, France; Department of Earth and Environmental Sciences, University of St Andrews, Fife, United Kingdom; Dept. Geodinàmica i Geofísica, Universitat de Barcelona, Barcelona, Spain; Aix Marseille Université, CNRS-IRD-Collège de France, UM34 CEREGE, Aix-en-Provence, France
Recommended Citation:
Rodríguez-Rodríguez L.,Jiménez-Sánchez M.,Domínguez-Cuesta M.J.,et al. Chronology of glaciations in the Cantabrian Mountains (NW Iberia) during the Last Glacial Cycle based on in situ-produced 10Be[J]. Quaternary Science Reviews,2016-01-01,138