Rethinking Late Weichselian ice‐sheet dynamics in coastal NW Svalbard
Rethinking Late Weichselian ice‐sheet dynamics in coastal NW Svalbard
复制标题
重新思考斯瓦尔巴群岛西北部沿海的晚威克塞尔期冰盖动力学
DOI：
10.1111/j.1502-3885.2005.tb01001.x
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发表时间：
2005
期刊：
影响因子：
2.2
通讯作者：
D. Ottesen
中科院分区：
文献类型：
--
作者：
J. Landvik;Ó. Ingólfsson;J. Mienert;S. Lehman;A. Solheim;Anders Elverhøi;D. Ottesen
新的海洋地质证据有助于更好地了解最后一个斯瓦尔巴/巴伦支海冰盖西缘的冰盖动态。 Kongsfjordrenna 跨陆架槽中的一组冰川沉积物可以向南追踪到 Prins Karls Forland 以西的陆架。大陆架上的一个显着的冰碛系统显示出晚威克塞尔冰的最小范围，表明冰川冰也覆盖了斯瓦尔巴群岛西北部的沿海低地。我们的研究结果表明，跨陆架槽被快速流动的冰流充满，与相邻陆架和浅滩上动态不太活跃的冰有着清晰的边界。后一种冰川模式有利于保存靠近 Kongsfjorden 冰川系统主要通道的较古老的地质记录。我们认为，相同的模型可能适用于沿斯瓦尔巴群岛西北部其他峡湾以及巴伦支冰盖西缘的晚魏希瑟利亚冰川排水。冰川状况的这种差异可以解释海洋和陆地地质记录之间的明显矛盾，也可以作为其他峡湾地区冰川动力学的模型。
New marine geological evidence provides a better understanding of ice‐sheet dynamics along the western margin of the last Svalbard/Barents Sea Ice Sheet. A suite of glacial sediments in the Kongsfjordrenna cross‐shelf trough can be traced southwards to the shelf west of Prins Karls Forland. A prominent moraine system on the shelf shows minimum Late Weichselian ice extent, indicating that glacial ice also covered the coastal lowlands of northwest Svalbard. Our results suggest that the cross‐shelf trough was filled by a fast‐flowing ice stream, with sharp boundaries to dynamically less active ice on the adjacent shelves and strandflats. The latter glacial mode favoured the preservation of older geological records adjacent to the main pathway of the Kongsfjorden glacial system. We suggest that the same model may apply to the Late Weichselian glacier drainage along other fjords of northwest Svalbard, as well as the western margin of the Barents Ice Sheet. Such differences in glacier regime may explain the apparent contradictions between the marine and land geological record, and may also serve as a model for glaciation dynamics in other fjord regions.