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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Geomorphology of the onset area of a paleo-ice stream, Marguerite Bay, Antarctic Peninsula
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Geomorphology of the onset area of a paleo-ice stream, Marguerite Bay, Antarctic Peninsula

机译：南极半岛玛格丽特湾的古冰流起始区的地貌

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摘要

Geomorphic features indicate that both glacial and melt-water erosion characterize the onset area of the ancestral Marguerite Ice Stream. The large size of these features indicates that they formed over repeated glacial cycles, most recently during the Last Glacial Maximum. Ice drainage within the bay and on the inner continental shelf was strongly influenced by tectonic fabric. Deep, isolated basins surrounded by rugged bedrock bathymetry characterize the innermost part of the bay. Drumlins and other streamlined features occur in the floors of these basins at depths of up to 900 m. The outer bay has three large interconnected basins. Drumlins and megaflutings within these basins indicate ice was grounded at water depths up to 1000 m. The orientations of these features show convergence of drainage from the northeast, east and south into the Marguerite paleo-ice stream. On the inner continental shelf, the ice converged into a single, wide trough dominated by mega-scale glacial lineations. This transition in geomorphic features from drumlins and megaflutings to mega-scale glacial lineations occurs at the location on the continental shelf where sedimentary strata blanket bedrock, and marks a zone of acceleration of the ice stream. The glacially sculptured geomorphic features within Marguerite Bay co-exist with anastomosing, radial and relatively straight channels, which become increasingly focused in a seaward direction. This implies that a well organized subglacial drainage system existed within the bay at some point in the past. Copyright (C) 2008 John Wiley & Sons, Ltd.
机译：地貌特征表明，冰川和融化水侵蚀都是祖先玛格丽特冰流的起始区域。这些特征的大尺寸表明它们是在重复的冰川周期中形成的，最近一次是在“最后一次冰川最大期”期间形成的。海湾内部和大陆架内部的排冰受到构造构造的强烈影响。崎most不平的基岩测深仪包围着深处的孤立盆地，这是海湾最内层的特征。在这些盆地的底部，深达900 m的区域都出现了Drumlins和其他流线型特征。外海湾有三个相互连接的大型盆地。这些盆地中的Drumlins和巨浪表明，冰被冻结在水深达1000 m的地方。这些特征的方向显示了从东北，东部和南部到玛格丽特古冰流中的排水汇聚。在内陆大陆架上，冰汇聚成一个单一的宽谷，由大型冰川系支配。地貌特征从鼓粉岩和大型起伏转变为大型冰川系，发生在大陆架上沉积岩层覆盖基岩的位置，标志着冰流加速带。玛格丽特湾内经过冰雕雕刻的地貌特征与吻合的，放射状的和相对笔直的河道并存，这些河道越来越集中在朝海的方向。这意味着过去某个时候海湾内存在一个组织良好的冰川下排水系统。版权所有（C）2008 John Wiley＆Sons，Ltd.

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