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首页> 外文期刊>Journal of quaternary science: JQS >Late Devensian deglaciation of the Tyne Gap Palaeo-Ice Stream, northern England
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Late Devensian deglaciation of the Tyne Gap Palaeo-Ice Stream, northern England

机译：英格兰北部泰恩峡古冰流的晚期德文斯纪冰消期

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摘要

The deglacial history of the central sector of the last British-Irish Ice Sheet is poorly constrained, particularly along major ice-stream flow paths. The Tyne Gap Palaeo-Ice Stream (TGIS) was a major fast-flow conduit of the British-Irish Ice Sheet during the last glaciation. We reconstruct the pattern and constrain the timing of retreat of this ice stream using cosmogenic radionuclide (Be-10) dating of exposed bedrock surfaces, radiocarbon dating of lake cores and geomorphological mapping of deglacial features. Four of the five 10Be samples produced minimum ages between 17.8 and 16.5 ka. These were supplemented by a basal radiocarbon date of 15.7 +/- 0.1 cal ka BP, in a core recovered from Talkin Tarn in the Brampton Kame Belt. Our new geochronology indicates progressive retreat of the TGIS from 18.7 to 17.1 ka, and becoming ice free before 16.4-15.7 ka. Initial retreat and decoupling of the TGIS from the North Sea Lobe is recorded by a prominent moraine 10-15 km inland of the present-day coast. This constrains the damming of Glacial Lake Wear to a period before similar to 18.7-17.1 ka in the area deglaciated by the contraction of the TGIS. We suggest that retreat of the TGIS was part of a regional collapse of ice-dispersal centres between 18 and 16 ka. Copyright (c) 2015 The Authors. Journal of Quaternary Science Published by John Wiley & Sons Ltd.
机译：上一个英爱尔兰冰原的中央区的冰河时期受到的约束很有限，尤其是在主要的冰流流动路径上。泰恩河峡古冰流（TGIS）是上一次冰期期间英爱冰原的主要快速流动管道。我们使用暴露的基岩表面的宇宙成因放射性核素（Be-10）测年，湖芯的放射性碳测年和冰期特征的地貌测绘来重建该模式并限制该冰流的退缩时间。 5个10Be样本中有4个的最小年龄介于17.8和16.5 ka之间。在从Brampton Kame带的Talkin Tarn回收的岩心中，补充了15.7 +/- 0.1 cal ka BP的基础放射性碳数据。我们的新地球年代学表明，TGIS从18.7 ka逐渐退缩到17.1 ka，并且在16.4-15.7 ka之前没有结冰。 TGIS与北海裂谷的最初退缩和脱钩是由今天海岸内陆10-15公里的显着冰ora记录的。这将冰川湖磨损的坝期限制在由TGIS收缩造成的冰区中的18.7-17.1 ka之前。我们建议，TGIS的撤退是18至16 ka之间冰扩散中心区域崩溃的一部分。版权所有（c）2015作者。约翰·威利父子有限公司出版的《第四纪科学杂志》

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