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:
memoirs
影响因子:
--
通讯作者:
G. Kuhn
G. Kuhn
中科院分区:
--
文献类型:
--
作者:
F. Nitsche;R. Larter;K. Gohl;A. Graham;G. Kuhn

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在部分冰川化大陆边缘,特别是南极洲周围的内大陆架,地面冰移走了先前存在的沉积物覆盖层,在被侵蚀的基底上留下了冰下的底形(安德森等人,2001年; Wellner等人,2001年)。虽然占主导地位的冰下底形通常遵循一种独特的、相对统一的模式,这可能与古冰流和基底地质的总体趋势有关(Wellner等人,2006年),但其他底形的分布更为随机,可能反映了当地基底的变化。在这里,我们描述和讨论的例子,大,孤立的峭壁和尾巴的功能,被公认的阿蒙森海大陆架。 Getz冰架前方的槽由古冰流形成,被裸露的基岩覆盖(Nitsche等人,2007年; Larter等人,2009年)。海底保存的地貌特征包括基岩水道、沟槽和鼓形地貌(图1a)。在这些特征之间是突出的浅土丘(图1a中的白色箭头),
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 …