Three sediment cores recovered on the lower slope of the continental shelf in western Baffin Bay (Arctic Canada) as well as swath bathymetry and subbottom profiler data collected on the shelf and slope of the region were analysed to investigate whether the Laurentide Ice Sheet (LIS) reached the shelf edge offshore Home Bay during the Last Glacial Maximum (LGM). Physical, sedimentological and palaeomagnetic analyses of the cores were also used to constrain the chronostratigraphy of upper sedimentary facies of the Home Bay trough‐mouth fan (TMF). Seven lithofacies were identified in the cores and reveal that the sediments recorded a genuine geomagnetic signal and that the cores span the last 40 ka. In the Home Bay Trough, sets of elongated ridges are discernible on swath bathymetry imagery and are interpreted as mega‐scale glacial lineations (MSGLs) resulting from an ice stream eroding the trough and delivering glacigenic sediments to the TMF. The geomorphology of the TMF, combined with the sedimentary records and the chronostratigraphy, indicates that a series of debris flows and turbidity currents were generated between 35 and 15 ka BP. These results indicate that the LIS margin extended near the shelf edge during the LGM and allow us to propose a new maximum extent of the LIS during the Last Glacial episode.

中文翻译：

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确定末次冰期期间 Home Bay（加拿大北极东部）Laurentide 冰盖的最大范围

分析了在巴芬湾西部（加拿大北极地区）大陆架下斜坡回收的三个沉积物岩心以及在该地区大陆架和斜坡上收集的条带测深和海底剖面仪数据，以研究劳伦泰德冰盖 (LIS)在末次盛冰期 (LGM) 期间到达 Home Bay 近海的陆架边缘。岩心的物理、沉积学和古地磁分析也用于约束 Home Bay 槽口扇 (TMF) 上层沉积相的年代地层学。在岩心中确定了 7 种岩相，表明沉积物记录了真正的地磁信号，并且岩心跨越了过去 40 ka。在家庭湾海槽中，一组细长的山脊在条带测深图像上是可辨别的，并且被解释为由冰流侵蚀槽并将冰川沉积物输送到 TMF 产生的巨型冰川线 (MSGL)。TMF 的地貌，结合沉积记录和年代地层，表明在 35 至 15 ka BP 之间产生了一系列泥石流和浊流。这些结果表明，在 LGM 期间，LIS 边缘在陆架边缘附近延伸，并允许我们提出末次冰期期间 LIS 的新最大范围。表明在 35 至 15 ka BP 之间产生了一系列泥石流和浊流。这些结果表明，在 LGM 期间，LIS 边缘在陆架边缘附近延伸，使我们能够提出末次冰期期间 LIS 的新最大范围。表明在 35 至 15 ka BP 之间产生了一系列泥石流和浊流。这些结果表明，在 LGM 期间，LIS 边缘在陆架边缘附近延伸，并允许我们提出末次冰期期间 LIS 的新最大范围。