Arid
DOI10.1111/j.1365-3091.2009.01123.x
Development of sediment-landform associations at cold glacier margins, Dry Valleys, Antarctica
Hambrey, Michael J.1; Fitzsimons, Sean J.2
通讯作者Hambrey, Michael J.
来源期刊SEDIMENTOLOGY
ISSN0037-0746
出版年2010
卷号57期号:3页码:857-882
英文摘要

The impact of modern cold glaciers on arid periglacial landscapes has received little attention compared with other glacial regimes, and there is a widely held assumption that cold glaciers are not effective geomorphological agents, despite recent studies to the contrary. This paper focuses on the processes operating at the margins of a number of glaciers in the Dry Valleys of Victoria Land, notably the Wright Lower Glacier. The glaciers are entraining primarily older drift deposits and highly weathered regolith which texturally are sandy gravels, as well as well-sorted sands of fluvial origin. Despite basal temperatures of the order of -16 degrees C, frozen layers and blocks of sand and gravel are being incorporated into the base of the glaciers by folding and thrusting. The sedimentary products are ridges and aprons several metres high within which the principal lithofacies are sand, gravel, foliated glacier ice, lake ice and snow. These facies are glaciotectonized strongly. Draped over these landforms is a veneer of well-sorted aeolian sand up to half a metre thick. Supraglacial streams flowing off the glaciers incise these landforms and the sediment is redeposited as alluvial fans, lake deltas and lake-bottomset deposits. Overall the sediment/landform association differs markedly from those of other glacial regimes, with sand and gravel being the dominant facies, while the usual indicators of glacier working (such as facets and striations on clasts) are lacking. The preservation potential for these landforms on a thousand-year time scale is high, as modification in this arid regime by slope processes and running water is limited. Sublimation of buried ice is so slow that ridge features are likely to remain ice-cored almost indefinitely, modified only by wind transport and weathering.


英文关键词Antarctica cold glaciers debris entrainment Dry Valleys glacial deposition glacial landforms
类型Article
语种英语
国家Wales ; New Zealand
收录类别SCI-E
WOS记录号WOS:000275647600007
WOS关键词SOUTH VICTORIA LAND ; THRUST-BLOCK MORAINES ; EAST ANTARCTICA ; DEBRIS ENTRAINMENT ; TAYLOR GLACIER ; ICE CAPS ; TRANSPORT ; SVALBARD ; GENESIS ; ENVIRONMENTS
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/166388
作者单位1.Aberystwyth Univ, Ctr Glaciol, Inst Geog & Earth Sci, Aberystwyth SY23 3DB, Ceredigion, Wales;
2.Univ Otago, Dept Geog, Dunedin, New Zealand
推荐引用方式
GB/T 7714
Hambrey, Michael J.,Fitzsimons, Sean J.. Development of sediment-landform associations at cold glacier margins, Dry Valleys, Antarctica[J],2010,57(3):857-882.
APA Hambrey, Michael J.,&Fitzsimons, Sean J..(2010).Development of sediment-landform associations at cold glacier margins, Dry Valleys, Antarctica.SEDIMENTOLOGY,57(3),857-882.
MLA Hambrey, Michael J.,et al."Development of sediment-landform associations at cold glacier margins, Dry Valleys, Antarctica".SEDIMENTOLOGY 57.3(2010):857-882.
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