Subglacial sediments: A regional geological template for ice flow in West Antarctica
Subglacial sediments: A regional geological template for ice flow in West Antarctica
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DOI：
10.1029/2000gl011788
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发表时间：
2001-09-15
影响因子：
5.2
通讯作者：
Joughin, I
中科院分区：
文献类型：
--
作者：
Studinger, M;Bell, RE;Joughin, I
我们利用航空地球物理数据来估计西南极冰盖 (WAIS) 下方海洋冰下沉积物和断层沉积盆地的分布。我们发现大量的冰流仅发生在冰下沉积物覆盖的区域。冰流的起始点和侧缘与海洋沉积物的界限一致。侧缘也始终与断层边界盆地相关。我们预测冰流 B 和 C-1 不太可能向海洋或裂谷沉积物覆盖区域之外的冰分界线迁移。冰下地质有可能调节冰流和 WAIS 的动态演化。
We use aerogeophysical data to estimate the distribution of marine subglacial sediments and fault-bounded sedimentary basins beneath the West Antarctic Ice Sheet (WAIS). We find that significant ice flow occurs exclusively in regions covered by subglacial sediments. The onsets and lateral margins of ice streams coincide with the limit of marine sediments. Lateral margins are also consistently linked with fault-bounded basins. We predict that the inland migration of ice streams B and C-1 towards the ice divide outside the region covered by marine or rift sediments is unlikely. The subglacial geology has the potential to modulate the dynamic evolution of the ice streams and the WAIS.