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Multibeam Bathymetry and Distribution of Clay Minerals on Surface Sediments of a Small Bay in Terra Nova Bay, Antarctica
Minerals ( IF 2.5 ) Pub Date : 2021-01-13 , DOI: 10.3390/min11010072
Jaewoo Jung , Youngtak Ko , Joohan Lee , Kiho Yang , Young Kyu Park , Sunghan Kim , Heungsoo Moon , Hyoung Jun Kim , Kyu-Cheul Yoo

The second Antarctic station of South Korea was constructed at Terra Nova Bay, East Antarctica, but local seafloor morphology and clay mineralogical characteristics are still not fully understood. Its small bay is connected to a modern Campbell Glacier, cliffs, and raised beaches along the coastline. Fourteen sampling sites to collect surface sediments were chosen in the small bay for grain size and clay mineral analyses to study the sediment source and sediment-transport process with multibeam bathymetry and sub-bottom profiles. Under the dominant erosional features (streamlined feature and meltwater channel), icebergs are the major geological agent for transport and deposition of coarse-sized sediments along the edge of glaciers in summer, and thus the study area can reveal the trajectory of transport by icebergs. Glacier meltwater is an important agent to deposit the clay-sized detritus and it results from the dominance of the illite content occurring along the edge of Campbell Glacier Tongue. The high smectite content compared to Antarctic sediments may be a result of the source of the surrounding volcanic rocks around within the Melbourne Volcanic Province.

中文翻译:

南极Terra Nova海湾小海湾表层沉积物上的多束测深和粘土矿物分布

韩国的第二个南极站是在南极东部的Terra Nova湾建造的,但当地海底形态和粘土矿物学特征仍未完全了解。它的小海湾与现代的坎贝尔冰川,悬崖和海岸线上凸起的海滩相连。在小海湾中选择了14个采样点来收集表层沉积物,以进行粒度和粘土矿物分析,以利用多波束测深法和底下剖面研究沉积物的来源和沉积物的输送过程。在主要的侵蚀特征(流线型特征和融水通道)下,冰山是夏季沿冰川边缘输送和沉积较粗大沉积物的主要地质因子,因此研究区可以揭示冰山的运输轨迹。冰川融水是沉积粘土状碎屑的重要物质,其起因于坎贝尔冰川舌缘边缘伊利石含量占优势。与南极沉积物相比,蒙脱石含量高可能是由于墨尔本火山省内周围火山岩的来源造成的。
更新日期:2021-01-13
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