Crag-and-tail features on the Amundsen Sea continental shelf, West Antarctica
Crag-and-tail features on the Amundsen Sea continental shelf, West Antarctica
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西南极洲阿蒙森海大陆架上的岩尾特征
DOI:
10.1144/m46.2
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
G. Kuhn
中科院分区:
文献类型:
--
作者:
F. Nitsche;R. Larter;K. Gohl;A. Graham;G. Kuhn
On parts of glaciated continental margins, especially the inner shelves around Antarctica, grounded ice has removed pre-existing sedimentary cover, leaving subglacial bedforms on eroded substrates (Anderson et al. 2001; Wellner et al. 2001). While the dominant subglacial bedforms often follow a distinct, relatively uniform pattern that can be related to overall trends in palaeo-ice flow and substrate geology (Wellner et al. 2006), others are more randomly distributed and may reflect local substrate variations. Here we describe and discuss examples of large, isolated crag-and-tail features that are recognized on the Amundsen Sea continental shelf.
The trough in front of Getz Ice Shelf which was generated by palaeo-ice streams, is floored by exposed bedrock (Nitsche et al. 2007; Larter et al. 2009). Geomorphological features preserved at the seabed include bedrock channels, grooves and drumlin-shaped landforms (Fig. 1a). In between these features are prominent, shallower mounds (white arrows in Fig. 1a) that …