DOI: 10.1016/j.quascirev.2012.11.007
Scopus记录号: 2-s2.0-84871913109
论文题名: First geomorphological record and glacial history of an inter-ice stream ridge on the West Antarctic continental shelf
作者: Klages J.P. ; Kuhn G. ; Hillenbrand C.-D. ; Graham A.G.C. ; Smith J.A. ; Larter R.D. ; Gohl K.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 61 起始页码: 47
结束页码: 61
语种: 英语
英文关键词: Amundsen Sea
; Glacial flow
; Glacial history
; Glacial retreat
; Ice stream
; Inter-ice stream ridge
; Last Glacial Maximum
; Pine Island Bay
; West Antarctic Ice Sheet
Scopus关键词: Amundsen Sea
; Glacial flow
; Glacial history
; Glacial retreat
; Ice sheet
; Ice streams
; Inter-ice stream ridge
; Last Glacial Maximum
; Pine Island Bay
; Geomorphology
; Glaciers
; Landforms
; Sea ice
; Glacial geology
; continental shelf
; geomorphology
; glacial history
; glacier retreat
; ice flow
; ice stream
; iceberg
; Last Glacial
; Last Glacial Maximum
; moraine
; overprinting
; proglacial environment
; swath bathymetry
; Amundsen Sea
; Antarctica
; Pine Island Bay
; Southern Ocean
; West Antarctic Ice Sheet
; West Antarctica
英文摘要: Inter-ice stream areas cover significant portions of Antarctica's formerly glaciated shelves, but have been largely neglected in past geological studies because of overprinting by iceberg scours. Here, we present results of the first detailed survey of an inter-ice stream ridge from the West Antarctic continental shelf. Well-preserved sub- and proglacial bedforms on the seafloor of the ridge in the eastern Amundsen Sea Embayment (ASE) provide new insights into the flow dynamics of this sector of the West Antarctic Ice Sheet (WAIS) during the Last Glacial cycle. Multibeam swath bathymetry and PARASOUND acoustic sub-bottom profiler data acquired across a mid-shelf bank, between the troughs of the Pine Island-Thwaites (PITPIS) and Cosgrove palaeo-ice streams (COPIS), reveal large-scale ribbed moraines, hill-hole pairs, terminal moraines, and crevasse-squeeze ridges. Together, these features form an assemblage of landforms that is entirely different from that in the adjacent ice-stream troughs, and appears to be unique in the context of previous studies of Antarctic seafloor geomorphology. From this assemblage, the history of ice flow and retreat from the inter-ice stream ridge is reconstructed. The bedforms indicate that ice flow was significantly slower on the inter-ice stream ridge than in the neighbouring troughs. While terminal moraines record at least two re-advances or stillstands of the ice sheet during deglaciation, an extensive field of crevasse-squeeze ridges indicates ice stagnation subsequent to re-advancing ice, which deposited the field of terminal moraines in the NE. The presented data suggest that the ice flow behaviour on the inter-ice stream ridge was substantially different from that in the adjacent troughs. However, newly obtained radiocarbon ages on two sediment cores recovered from the inter-ice stream ridge suggest a similar timing in the deglaciation of both areas. This information closes an important gap in the understanding of past WAIS behaviour in the eastern ASE. Our newly-documented bedforms will also serve as an important diagnostic tool in future studies for interpreting ice-sheet histories in similar inter-ice stream areas. © 2012 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60725
Appears in Collections: 过去全球变化的重建
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作者单位: Alfred Wegener Institute for Polar and Marine Research, Am Alten Hafen 26, 27568 Bremerhaven, Germany; British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, United Kingdom
Recommended Citation:
Klages J.P.,Kuhn G.,Hillenbrand C.-D.,et al. First geomorphological record and glacial history of an inter-ice stream ridge on the West Antarctic continental shelf[J]. Quaternary Science Reviews,2013-01-01,61