Submarine landforms related to glacier retreat in a shallow Antarctic fjord
Submarine landforms related to glacier retreat in a shallow Antarctic fjord
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DOI：
10.1017/s0954102016000262
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发表时间：
2016-07
影响因子：
1.6
通讯作者：
A. Wölfl;N. Wittenberg;P. Feldens;H. Hass;C. Betzler;G. Kuhn
中科院分区：
文献类型：
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作者：
A. Wölfl;N. Wittenberg;P. Feldens;H. Hass;C. Betzler;G. Kuhn
摘要自末次盛冰期以来，南设得兰群岛峡湾的冰已经消退，留下了宝贵的海底地貌记录。在这项研究中，冰川地貌和底层特征已被映射到调查晚全新世撤退行为的Fourcade冰川和描绘过去的环境过程中，波特湾，国王乔治岛。综合数据集包括高分辨率条带测深、浅层地震剖面和一个沉积物岩心。冰碛，冰碛切口和冰川线理绘制在海湾内部的海底，而麻点，冰冲刷痕迹和通道结构被确定在外部。海底下特征已被分配到不同的声学相类型，表明不同的沉积环境。结果表明，冰川衰退以及stillstations和潜在的readvances在晚全新世。此外，沉积物记录表明，在小冰期（500-100 cal yr bp），Fourcade冰川位于内湾内。
Abstract Since the Last Glacial Maximum, ice has retreated through the fjords of the South Shetland Islands leaving a valuable record of submarine landforms behind. In this study, glacial landforms and sub-bottom characteristics have been mapped to investigate the late Holocene retreat behaviour of the Fourcade Glacier and to delineate past environmental processes in Potter Cove, King George Island. The comprehensive datasets include high-resolution swath bathymetry, shallow seismic profiling and one sediment core. Moraines, moraine incisions and glacial lineations were mapped on the sea floor in the inner part of the cove, whereas pockmarks, ice scour marks and channel structures were identified in the outer part. Sub-bottom characteristics have been assigned to different acoustic facies types indicating different depositional settings. The results reveal glacial recessions as well as stillstands and potential readvances during the late Holocene. Furthermore, the sediment record indicates that the Fourcade Glacier was situated inside the inner cove during the Little Ice Age (500–100 cal yr bp).