The last deglaciation of the Norwegian Channel – geomorphology, stratigraphy and radiocarbon dating
The last deglaciation of the Norwegian Channel – geomorphology, stratigraphy and radiocarbon dating
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挪威海峡的最后一次冰消期——地貌学、地层学和放射性碳测年
DOI：
10.1111/bor.12272
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发表时间：
2018
期刊：
影响因子：
2.2
通讯作者：
Cathrina Schäuble
中科院分区：
文献类型：
--
作者：
B. Morén;H. Sejrup;B. O. Hjelstuen;Marianne V. Borge;Cathrina Schäuble
基于高分辨率 TOPAS 声学数据、测深数据集和挪威海峡的沉积岩芯，对挪威海峡冰流的最后一次消退进行了调查。对挪威西部附近的接地区楔形物和终端冰碛等冰缘特征的测绘表明，这部分航道的接地线后退被频繁的静止点所打断，而耶伦入口以南的航道没有穿越冰缘地貌。已确定了三个主要地震单元，根据其地震特征，除了沉积物岩心研究外，将这些单元解释为冰碛层（U1）、冰海沉积物（U2）和全新世半中上层沉积物（U3）。根据新公布的 U2 下部放射性碳测年数据，并结合邻近地区的数据，可以得出结论，接地线在 19 ka 左右开始从陆架边缘后退，而斯卡格拉克内部在 17.6 ka 时已无冰。这给出了 450 m a−1 的平均退缩率，通常高于其他古冰流估计的平均退缩率 (15–310 m a−1)。
Based on high‐resolution TOPAS acoustic data, bathymetric data sets and sediment cores from the Norwegian Channel, the last retreat of the Norwegian Channel Ice Stream has been investigated. Mapping of ice‐marginal features such as grounding‐zone wedges and terminal moraines off western Norway suggest that the retreat of the grounding line in this part of the channel was interrupted by frequent stillstands, whereas the channel south of the threshold at Jæren does not have crossing ice‐marginal landforms. Three main seismic units have been identified, and, based on their seismic characteristics, in addition to study of sediment cores, these units are interpreted as till (U1), glacial marine sediment (U2) and Holocene hemipelagic sediment (U3). Based on new and published radiocarbon dates of the lower part of U2, combined with dates from the adjacent areas, it is concluded that the grounding line started to retreat from the shelf edge at about 19 ka and that the inner part of Skagerrak was ice free at 17.6 ka. This gives an average retreat rate of 450 m a−1, which is generally higher than mean retreat rates estimated for other palaeo‐ice streams (15–310 m a−1).
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影响因子：
18.3
作者：
Rignot, Eric;Bamber, Jonathan L.;Van Meijgaard, Erik
通讯作者：
Van Meijgaard, Erik
影响因子：
12.1
作者：
Livingstone, Stephen J.;Cofaigh, Colm O.;Jamieson, Stewart S. R.
通讯作者：
Jamieson, Stewart S. R.
影响因子：
18.3
作者：
S. Jamieson;A. Vieli;S. Livingstone;C. Ó. Cofaigh;C. Stokes;C. Hillenbrand;J. Dowdeswell
通讯作者：
S. Jamieson;A. Vieli;S. Livingstone;C. Ó. Cofaigh;C. Stokes;C. Hillenbrand;J. Dowdeswell
贝叶斯模型对爱尔兰海冰流的消退进行建模
影响因子：
2.3
作者：
Chiverrell R
通讯作者：
Chiverrell R
南极半岛西部玛格丽特湾古冰流的冰川地貌
影响因子：
2.2
作者：
Livingstone S
通讯作者：
Livingstone S