globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.10.014
Scopus记录号: 2-s2.0-84993999927
论文题名:
Geomorphic and shallow-acoustic investigation of an Antarctic Peninsula fjord system using high-resolution ROV and shipboard geophysical observations: Ice dynamics and behaviour since the Last Glacial Maximum
作者: García M.; Dowdeswell J.A.; Noormets R.; Hogan K.A.; Evans J.; Ó Cofaigh C.; Larter R.D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 153
起始页码: 122
结束页码: 138
语种: 英语
英文关键词: Antarctic Peninsula ; Fjord systems ; Geomorphology ; Glacial sedimentary processes ; Last Glacial Maximum ; ROV-Derived bathymetry
Scopus关键词: Bathymetry ; Catchments ; Geomorphology ; Glacial geology ; Landforms ; Sedimentology ; Antarctic Peninsula ; Fine-grained sediment ; Geophysical observations ; Last Glacial Maximum ; Morphological study ; Sedimentary process ; Sedimentary systems ; Submarine landforms ; Ice ; acoustic survey ; bathymetric survey ; continental shelf ; fjord ; geomorphology ; glacier dynamics ; Holocene ; ice mechanics ; Last Glacial Maximum ; moraine ; remotely operated vehicle ; sedimentary sequence ; tidewater glacier ; Antarctic Peninsula ; Antarctica ; Marguerite Bay ; West Antarctica
英文摘要: Detailed bathymetric and sub-bottom acoustic observations in Bourgeois Fjord (Marguerite Bay, Antarctic Peninsula) provide evidence on sedimentary processes and glacier dynamics during the last glacial cycle. Submarine landforms observed in the 50 km-long fjord, from the margins of modern tidewater glaciers to the now ice-distal Marguerite Bay, are described and interpreted. The landforms are grouped into four morpho-sedimentary systems: (i) glacial advance and full-glacial; (ii) subglacial and ice-marginal meltwater; (iii) glacial retreat and neoglaciation; and (iv) Holocene mass-wasting. These morpho-sedimentary systems have been integrated with morphological studies of the Marguerite Bay continental shelf and analysed in terms of the specific sedimentary processes and/or stages of the glacial cycle. They demonstrate the action of an ice-sheet outlet glacier that produced drumlins and crag-and-tail features in the main and outer fjord. Meltwater processes eroded bedrock channels and ponds infilled by fine-grained sediments. Following the last deglaciation of the fjord at about 9000 yr BP, subsequent Holocene neoglacial activity involved minor readvances of a tidewater glacier terminus in Blind Bay. Recent stillstands and/or minor readvances are inferred from the presence of a major transverse moraine that indicates grounded ice stabilization, probably during the Little Ice Age, and a series of smaller landforms that reveal intermittent minor readvances. Mass-wasting processes also affected the walls of the fjord and produced scars and fan-shaped deposits during the Holocene. Glacier-terminus changes during the last six decades, derived from satellite images and aerial photographs, reveal variable behaviour of adjacent tidewater glaciers. The smaller glaciers show the most marked recent retreat, influenced by regional physiography and catchment-area size. © 2016
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被引频次[WOS]:12   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59392
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作者单位: Instituto Andaluz de Ciencias de la Tierra, CSIC-University of Granada, Avda. de las Palmeras, 4., Armilla, Spain; Scott Polar Research Institute, University of Cambridge, Lensfield Road, Cambridge, United Kingdom; Departments of Arctic Geology and Arctic Geophysics, University Centre in Svalbard, Longyearbyen, Norway; British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, United Kingdom; Department of Geography, University of Loughborough, Loughborough, United Kingdom; Department of Geography, Durham University, Durham, United Kingdom

Recommended Citation:
García M.,Dowdeswell J.A.,Noormets R.,et al. Geomorphic and shallow-acoustic investigation of an Antarctic Peninsula fjord system using high-resolution ROV and shipboard geophysical observations: Ice dynamics and behaviour since the Last Glacial Maximum[J]. Quaternary Science Reviews,2016-01-01,153
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