Pockmarks in the SW Barents Sea and their links with iceberg ploughmarks
Pockmarks in the SW Barents Sea and their links with iceberg ploughmarks
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西南巴伦支海的麻点及其与冰山犁痕的联系
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发表时间：
2016
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影响因子：
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通讯作者：
D. Stoddart
中科院分区：
文献类型：
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作者：
S. Chand;T. Thorsnes;L. Rise;H. Brunstad;D. Stoddart
在一些高纬度大陆架的海底，观察到麻点和犁痕共存（图1）。麻点是圆形的椭圆形凹陷，直径达100米，深度几米，通常与地下流体流动有关（King & MacLean 1970）。它们可能表现为单个特征，也可能成群出现或形成长链（Hovland 1981）。犁痕是浅海和大陆架上的线性到曲线形凹陷，由冰山龙骨撞击沉积海底形成（例如，Woodwell-Lynas等人，1991年）。
Fig. 1.
（a）2009年HU Sverdrup II号巡航考察（由Lundin诺日AS提供资金）期间收集的巴伦支海西南部凹坑和犁痕多波束图像。采集系统孔斯贝格EM 710。频率70-100 kHz。网格单元尺寸5米。（B）麻点的放大图像，有些麻点沿着犁痕排列。（c）（B）中所示区域的反向散射图像。（d）显示分层海洋沉积物（黄线以上）和冰川沉积物（绿色线以上）的凹坑的海底下剖面仪数据。蓝线是现代海底。HUGIN HUS AUV采集系统。频率4-24 kHz。（e）研究区域的位置（红框; IBCAO v.3.0地图）。
沿着印古什朱庇特凹陷的西北边界，在巴伦支海西南部的海底观察到许多火山口状特征。
Pockmarks and ploughmarks are observed to coexist on the floor of some high-latitude continental shelves (Fig. 1). Pockmarks are rounded to oval-shaped depressions up to few 100 m in diameter and few metres in depth and are often related to subsurface fluid-flow (King & MacLean 1970). They may appear as single features, in groups or as long chains (Hovland 1981). Ploughmarks are linear to curvilinear depressions in shallow seas and shelves, formed by iceberg keels impinging on the sedimentary seafloor (e.g. Woodworth-Lynas et al. 1991).
Fig. 1.
( a ) Multibeam image of pockmarks and ploughmarks from the SW Barents Sea collected during the 2009 HU Sverdrup II cruise (funded by Lundin Norge AS). Acquisition system Kongsberg EM710. Frequency 70–100 kHz. Grid-cell size 5 m. ( b ) Enlarged image of pockmarks, some aligned along a ploughmark. ( c ) Backscatter image of the area shown in (b). ( d ) Sub-bottom profiler data of a pockmark showing stratified marine (above yellow line) and glacimarine sediments (above green line). Blue line is modern seafloor. Acquisition system HUGIN HUS AUV. Frequency 4–24 kHz. ( e ) Location of study area (red box; map from IBCAO v. 3.0).
Many crater-like features are observed on the seafloor in the SW Barents Sea along the NW boundary of the Ingoydjupet depression …