A Laurentide outburst flooding event during the last interglacial period
A Laurentide outburst flooding event during the last interglacial period
复制标题
DOI：
10.1038/ngeo1622
复制
发表时间：
2012-12
影响因子：
18.3
通讯作者：
J. Nicholl;D. Hodell;B. Naafs;C. Hillaire‐Marcel;J. Channell;O. Romero
中科院分区：
文献类型：
--
作者：
J. Nicholl;D. Hodell;B. Naafs;C. Hillaire‐Marcel;J. Channell;O. Romero
拉布拉多海的离散碎屑沉积层记录了冰川-间冰期循环中冰盖崩解和融水释放的事件。最突出的层反映了与冷海因里希事件相关的冰山舰队的释放，但也保存了从劳伦泰德冰盖融化的冰川爆发洪水携带的碎屑沉积物。在这里，我们报告了一个广泛的红色碎屑物质层在拉布拉多海沉积在末次间冰期早期。我们跟踪层通过沉积物岩心收集沿着拉布拉多和格陵兰边缘的拉布拉多海。生物标志物数据、Ca/Sr比值和δ 18 O测量将红层中所含的碳酸盐与哈德逊湾的古生代基岩联系起来。我们得出的结论是，碎片被带到拉布拉多海在冰川爆发洪水通过哈德逊海峡，类似于最后的阿加西湖爆发洪水约8,400年前，可能在最后一次间冰期寒冷事件在北大西洋的时间。我们认为，爆发洪水与劳伦泰德冰盖的最终崩溃可能已经普遍的功能在晚第四纪间冰期的早期阶段。
Episodes of ice-sheet disintegration and meltwater release over glacial–interglacial cycles are recorded by discrete layers of detrital sediment in the Labrador Sea,. The most prominent layers reflect the release of iceberg armadas associated with cold Heinrich events, but the detrital sediment carried by glacial outburst floods from the melting Laurentide Ice Sheet is also preserved. Here we report an extensive layer of red detrital material in the Labrador Sea that was deposited during the early last interglacial period. We trace the layer through sediment cores collected along the Labrador and Greenland margins of the Labrador Sea. Biomarker data, Ca/Sr ratios and δ18O measurements link the carbonate contained in the red layer to the Palaeozoic bedrock of the Hudson Bay. We conclude that the debris was carried to the Labrador Sea during a glacial outburst flood through the Hudson Strait, analogous to the final Lake Agassiz outburst flood about 8,400 years ago, probably around the time of a last interglacial cold event in the North Atlantic. We suggest that outburst floods associated with the final collapse of the Laurentide Ice Sheet may have been pervasive features during the early stages of Late Quaternary interglacial periods.