DOI: 10.1016/j.quascirev.2013.04.006
Scopus记录号: 2-s2.0-84878409558
论文题名: Late Weichselian local ice dome configuration and chronology in Northwestern Svalbard: Early thinning, late retreat
作者: Gjermundsen E.F. ; Briner J.P. ; Akçar N. ; Salvigsen O. ; Kubik P. ; Gantert N. ; Hormes A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 72 起始页码: 112
结束页码: 127
语种: 英语
英文关键词: 10Be dating
; Cosmogenic exposure dating
; Erratic boulders
; Glacial geology
; Late Weichselian
; Northwest Spitsbergen
; Quaternary
; Spitsbergen
; Svalbard
; Svalbard Barents Sea Ice Sheet
; The High Arctic
Scopus关键词: <sup>10</sup>Be dating
; Barents sea
; Cosmogenic exposure
; Erratic boulders
; High arctic
; Late Weichselian
; Quaternary
; Spitsbergen
; Svalbard
; Catchments
; Glacial geology
; Glaciers
; Landforms
; Sea ice
; Domes
; arctic environment
; bedrock
; beryllium isotope
; boulder
; chronology
; deglaciation
; dome
; drainage basin
; elevation
; fjord
; glacier retreat
; glaciology
; Holocene
; ice cover
; ice flow
; ice sheet
; ice stream
; moraine
; provenance
; reconstruction
; Weichselian
; Arctic
; Arctic Ocean
; Barents Sea
; Liefdefjorden
; Spitsbergen
; Svalbard
; Svalbard and Jan Mayen
英文摘要: The chronology and configuration of the Svalbard Barents Sea Ice Sheet (SBSIS) during the Late Weichselian (LW) are based on few and geographically scattered data. Thus, the timing and configuration of the SBSIS has been a subject of extensive debate. We present provenance data of erratic boulders and cosmogenic 10Be ages of bedrock and boulders from Northwest Spitsbergen (NWS), Svalbard to determine the thickness, configuration and chronology during the LW. We sampled bedrock and boulders of mountain summits and summit slopes, along with erratic boulders from coastal locations around NWS. We suggest that a local ice dome over central NWS during LW drained radially in all directions. Provenance data from erratic boulders from northern coastal lowland Reinsdyrflya suggest northeastward ice flow through Liefdefjorden. 10Be ages of high-elevation erratic boulders in central NWS (687-836m above sea level) ranging from 18.3±1.3ka to 21.7±1.4ka, indicate that the centreof a local ice dome was at least 300m thicker than at present. 10Be ages of all high-elevation erratics (>400m above sea level, central and coastal locations) indicate the onset of ice dome thinning at 25-20ka. 10Be ages from erratic boulders on Reinsdyrflya ranging from 11.1±0.8ka to 21.4±1.7ka, indicate an ice cover over the entire Reinsdyrflya during LW and a complete deglaciation prior to the Holocene, but apparently later than the thinning in the mountains. Lack of moraine deposits, but the preservation of beach terraces, suggest that the ice covering this peninsula possibly was cold-based and that Reinsdyrflya was part of an inter ice-stream area covered by slow-flowing ice, as opposed to the adjacent fjord, which possibly was filled by a fast-flowing ice stream. Despite the early thinning of the ice sheet (25-20ka) we find a later timing of deglaciation of the fjords and the distal lowlands. Several bedrock samples (10Be) from vertical transects in the central mountains of NWS pre-date the LW, and suggest either ice free or pervasive cold-based ice conditions. Our reconstruction is aligned with the previously suggested hypothesis that a complex multi-dome ice-sheet-configuration occupied Svalbard and the Barents Sea during LW, with numerous drainage basins feeding fast ice streams, separated by slow flowing, possibly cold-based, inter ice-stream areas. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60601
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Arctic Geology, University Centre in Svalbard, P.O.Box 156, 9171 Longyearbyen, Norway; Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Geologische Institut, UniBern, CH, Switzerland; Institute of Geosciences, University of Oslo, Norway; ETH Zürich, CH, Switzerland
Recommended Citation:
Gjermundsen E.F.,Briner J.P.,Akçar N.,et al. Late Weichselian local ice dome configuration and chronology in Northwestern Svalbard: Early thinning, late retreat[J]. Quaternary Science Reviews,2013-01-01,72