East Antarctic ice stream tributary underlain by major sedimentary basin
East Antarctic ice stream tributary underlain by major sedimentary basin
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主要沉积盆地下方的东南南极冰流支流
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
D. Vaughan
中科院分区：
文献类型：
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作者：
J. Bamber;F. Ferraccioli;I. Joughin;Tony Shepherd;D. Rippin;M. Siegert;D. Vaughan
海洋沉积物和裂谷沉积物对南极西部冰盖的冰流流动起着根本性的控制作用，因此也对冰盖的物质平衡和稳定性起着根本性的控制作用。相比之下，大得多的东南极冰盖中的大多数冰流被认为是相对稳定的特征，可能位于结晶岩的下面。任何地质控制东南极冰盖增强流仍然在很大程度上未知。我们目前的航空地球物理证据表明，在南极东部冰盖内部的冰流增强的区域是由冰下沉积物1.3公里厚，这些都影响了上覆冰的流动状态。我们表明，冰下沉积物是重要的调制冰的动态，不仅为西南极冰盖，但也为它的更大的邻居，并建议这里确定的沉积盆地可能包含的信息，这部分东南极冰盖的新近纪冰川的历史。
Marine and rift sediments exert a fundamental control on ice stream flow in the West Antarctic Ice Sheet, and hence on its mass balance and stability. In contrast, most ice streams in the much larger East Antarctic Ice Sheet are thought to be relatively stable features resting on till, perhaps underlain by crystalline rock. Any geological controls on East Antarctic Ice Sheet enhanced flow remain largely unknown. We present aerogeophysical evidence indicating that a region of enhanced ice flow in the interior of the East Antarctic Ice Sheet is underlain by subglacial sediments ∼3 km thick and that these are influencing the flow regime of the overlying ice. We show that subglacial sediments are important in modulating ice dynamics, not just for the West Antarctic Ice Sheet, but also for its much larger neighbor, and suggest that the sedimentary basin identified here may contain information on the Neogene glacial history of this part of the East Antarctic Ice Sheet.