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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord-lake (Grand Lake, Labrador)
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Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord-lake (Grand Lake, Labrador)

机译：深峡湾 - 湖（Grand Lake，Labrador）的亡观与后螺旋沉积过程的形态签名

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摘要

High-resolution multibeam bathymetric data and acoustic sub-bottom profiles were recently collected in Grand Lake (Labrador), one of the deepest lake basins in eastern North America, to reconstruct: (1) the retreat of the Laurentide Ice Sheet (LIS) west of Lake Melville and (2) the history of sedimentation since deglaciation in this 54 km-long, 3 km-wide fjord-lake. Our results provide a morphostratigraphical framework that brings new insights to the style and pattern of retreat of the LIS in the region, as well as deglacial and postglacial sedimentary dynamics. Terrestrial glacial lineations observed on a digital elevation model (DEM) provide evidence of a previously undocumented ice stream in the Grand Lake area. This newly mapped ice stream suggests that the calving bay formed in Lake Melville triggered a reorganization of the regional drainage pattern of the LIS. The sedimentary infill of Grand Lake consists of a sequence of deglacial to postglacial sediments that contain deposits related to a series of mass movements. The 8.2 cal ka BP cold event is recorded in Grand Lake by a series of closely spaced moraines deposited at the outlet of the fjord-lake to form a morainic complex similar to the Cockburn morainic complex on Baffin Island. During deglaciation, a dense dendritic network of proglacial gullies incised into the steep sidewalls of the lake. Since deglaciation, paraglacial and postglacial sedimentation has led to the deposition of large prograding deltas at the fjord head, where density currents remain active today and have formed a series of sediment waves on the frontal slopes and a prodeltaic environment. (c) 2019 John Wiley & Sons, Ltd.
机译：最近在大湖（拉布拉多）是东北美最深的湖泊盆地之一，重建的高分辨率多阵容和声学子底型材，重建：（1）劳伦德冰板（LIS）西部的撤退梅尔维尔湖和（2）这54公里长3公里宽的湖北湖泊以来沉淀史。我们的结果提供了一个语气看物理框架，为该地区的LIS的撤退风格和模式以及冥想和后闪烁的沉积动态提供了新的洞察力。在数字海拔模型（DEM）上观察到的陆地冰川基地ateations提供了在Grand Lake地区以前无证冰流的证据。这种新映射的冰流表明，在梅尔维尔湖形成的产犊湾引发了LIS的区域引流模式的重组。 Grand Lake的沉积填料包括一系列令人垂直于后凝血性沉积物，其含有与一系列质量移动相关的沉积物。 8.2 Cal Ka BP Cold Event在Grand Lake中被一系列紧密间隔的冰盖录制在峡湾 - 湖的出口，形成类似于葡萄干岛上的羊毛羊毛复合物的羊毛复合物。在嗜好期间，将平底牙龈的密集树突网络切入湖泊的陡峭侧壁。由于扩大，滑动裂缝和后闪烁的沉降导致了在峡湾头部的大型漂接Δ沉积，其中密度电流仍然活跃，在正面斜坡和前孔环境上形成了一系列沉积波。 （c）2019 John Wiley＆Sons，Ltd。

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