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首页> 外文期刊>Quaternary Science Reviews: The International Multidisciplinary Review Journal >Seafloor geomorphology and glacimarine sedimentation associated with fast-flowing ice sheet outlet glaciers in Disko Bay, West Greenland
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Seafloor geomorphology and glacimarine sedimentation associated with fast-flowing ice sheet outlet glaciers in Disko Bay, West Greenland

机译：与西格陵兰湾德罗湾快速流动的冰板出口冰川相关的海底地貌和手套沉积物

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Fast-flowing outlet glaciers currently drain the Greenland Ice Sheet (GIS), delivering ice, meltwater and debris to the fjords around Greenland. Although such glaciers strongly affect the ice sheet's mass balance, their glacimarine processes and associated products are still poorly understood. This study provides a detailed analysis of lithological and geophysical data from Disko Bay and the Vaigat Strait in central West Greenland. Disko Bay is strongly influenced by Jakobshavn Isbr ae, Greenland's fastest-flowing glacier, which currently drains similar to 7% of the ice sheet. Streamlined glacial landforms record the former flow of an expanded Jakobshavn Isbr ae and adjacent GIS outlets through Disko Bay and the Vaigat Strait towards the continental shelf. Thirteen vibrocores contain a complex set of lithofacies including diamict, stratified mud, interbedded mud and sand, and bioturbated mud deposited by (1) suspension settling from meltwater plumes and the water column, (2) sediment gravity flows, and (3) iceberg rafting and ploughing. The importance of meltwater-related processes to glacimarine sedimentation in West Greenland fjords and bays is emphasised by the abundance of mud preserved in the cores. Radiocarbon dates constrain the position of the ice margin during deglaciation, and suggest that Jakobshavn Isbr ae had retreated into central Disko Bay before 10.6 cal ka BP and to beyond Isfjeldsbanken by 7.6-7.1 cal ka BP. Sediment accumulation rates were up to 1.7 cm a(-1) for ice-proximal glacimarine mud, and similar to 0.007-0.05 cm a(-1) for overlying distal sediments. In addition to elucidating the deglacial retreat history of Jakobshavn Isbr ae, our findings show that the glacimarine sedimentary processes in West Greenland are similar to those in East Greenland, and that variability in such processes is more a function of time and glacier proximity than of geographic location and associated climatic regime. Crown Copyright (C) 2017 Published by Elsevier Ltd. All rights reserved.
机译：快速流动的出口冰川目前排出格陵兰冰板（GIS），向格陵兰岛周围的海湾提供冰，熔融和碎片。虽然这种冰川强烈影响冰盖的质量平衡，但它们的手套过程和相关产品仍然明白很差。本研究详细分析了Disko Bay和格陵兰西区岩石海湾的岩性和地球物理数据。 Disko Bay受到格林兰最快流动的冰川jakobshavn isbr·布尔·普国的强烈影响，目前耗尽了类似于冰盖的7％。简化的冰川地貌通过Disko Bay和Vaigat海峡朝着大陆架上记录了展开的Jakobshavn ISBR AE和相邻的GIS网点的前流动。十三个Vibrocores含有一组复杂的岩型，包括敏捷，分层泥浆，冰箱泥土和沙子，以及（1）悬浮液从熔融羽毛和水柱沉积的生物静脉泥浆，（2）沉积物重力流动，（3）冰山漂流和耕作。通过在核心中保留的丰富的泥土，强调了熔融疏水相关过程对西格陵兰峡湾和海湾的手套沉降的重要性。 Radiocarbones日期约束了冰缘期间的冰缘，并建议Jakobshavn ISBR AE在10.6 Cal Ka BP之前撤退到中央Disko Bay，以至于7.6-7.1 Cal Ka BP。沉积物积累率高达1.7cm A（-1）冰近甲纤维泥浆，类似于覆盖远端沉积物的0.007-0.05cm A（-1）。除了阐明Jakobshavn ISBR AE的令人沮丧的撤退史外，我们的研究结果表明，西格陵兰群岛的手套沉积过程与东格陵兰的手套沉积过程类似，此类过程中的可变性更具时间和冰川靠近地理学的函数位置和相关气候制度。 Crown版权所有（c）2017由elestvier有限公司出版。保留所有权利。

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