The pre-glacial landscape of Antarctica
The pre-glacial landscape of Antarctica
复制标题
南极洲冰川前的景观
DOI：
10.1080/14702541.2018.1535090
复制
发表时间：
2018
影响因子：
1
通讯作者：
S. Jamieson
中科院分区：
文献类型：
--
作者：
D. Sugden;S. Jamieson
南极洲冰下地貌的研究不仅关系到我们对南极冰盖稳定性的认识，也关系到全球板块构造与地表过程之间相互作用的认识。我们相信地貌学有很大的贡献，但缺乏连贯的假设的起源冰下景观阻碍了理解。本文探讨了这个问题，使用南半球的大陆块在非洲和马达加斯加作为类似物。我们发现，南极景观演变的方式类似于在南部非洲的被动边缘演变。与冈瓦纳大陆分裂有关的裂谷作用改变了河流的基准面，导致裂谷侧翼的快速侵蚀，并伴随着裂谷边缘山脉的抬升。裂谷边缘平原，通常是沿海或沿着沿着大河向内陆延伸，背后是悬崖，而低梯度的大陆河流盆地则是南极洲内部的特征。在南极洲东部，冰移走了低地原有的风化层，并在海平面以下沿着主要干线河道挖出2-3公里的槽。 南极洲西部的微型大陆与马达加斯加相似，显然与沿海平原、背崖和内陆高原共享相似的地形。
ABSTRACT The geomorphology of the hidden subglacial landscape of Antarctica is relevant to our understanding of the stability of the Antarctic Ice Sheet and also to that of global interactions between plate tectonics and surface processes. We believe that geomorphology has much to contribute, but that the lack of coherent hypotheses about the origins of the subglacial landscape is holding back understanding. This paper approaches the problem by using southern hemisphere land masses in Africa and Madagascar as analogues. We find that the Antarctic landscape evolved in a similar way to passive margin evolution in southern Africa. Rifting associated with the breakup of Gondwana changed river base levels and caused rapid erosion on the flanks of rifts and was accompanied by the uplift of rift-margin mountains. Rift-margin plains, often coastal or extending inland along large rivers, are backed by an escarpment, while low-gradient continental river basins characterised the interior of Antarctica. In East Antarctica ice has removed pre-existing regolith from lowlands and excavated 2–3 km troughs below sea level along the course of major trunk rivers. The micro-continents of West Antarctica are comparable to Madagascar and apparently share a similar topography with coastal plains, backing escarpments and interior plateaux.
基岩侵蚀表面创下前南极东部冰盖范围
影响因子：
5.2
作者：
Paxman, Guy J.;Jamieson, Stewart S.;Ferraccioli, Fausto;Bentley, Michael J.;Ross, Neil;Armadillo, Egidio;Gasson, Edward G.;Leitchenkov, German;DeConto, Robert M.
通讯作者：
DeConto, Robert M.
DOI：
10.5194/esurf-3-139-2015
发表时间：
2014-07
期刊：
--
影响因子：
--
作者：
K. Rose;N. Ross;T. Jordan;R. Bingham;H. Corr;F. Ferraccioli;A. L. Brocq;D. Rippin;M. Siegert
通讯作者：
K. Rose;N. Ross;T. Jordan;R. Bingham;H. Corr;F. Ferraccioli;A. L. Brocq;D. Rippin;M. Siegert
影响因子：
5.3
作者：
Jamieson, Stewart S. R.;Sugden, David E.;Hulton, Nicholas R. J.
通讯作者：
Hulton, Nicholas R. J.