Sedimentary processes and carbonate mounds in the Belgica Mound province, Porcupine Seabight, NE Atlantic
Sedimentary processes and carbonate mounds in the Belgica Mound province, Porcupine Seabight, NE Atlantic
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大西洋东北部豪猪西湾 Belgica Mound 省的沉积过程和碳酸盐丘
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发表时间：
2004
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通讯作者：
J. Thiede
中科院分区：
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作者：
A. Wheeler;M. Kozachenko;A. Beyer;A. Foubert;V. Huvenne;M. Klages;D. Masson;K. O. Roy;J. Thiede
碳酸盐丘（高达200米）是由冷水珊瑚（主要是Lophelia pertusa和Madrepora oculata）、相关的钙质动物群和间隙沉积物堆积而成的，分布在爱尔兰西部500-1000米的水深。海底测绘数据集（侧扫声纳，多波束回声测深仪，海底剖面仪和水下视频图像）在这里展示了比利时丘省在东部豪猪海边缘。这些数据集成在地理信息系统（GIS）内，为土丘的发展提供了环境背景。对这一多学科数据集和所得到的相图的分析突出了不同的沉积过程（如沉积波、新月形沙丘、砾石滞后和砂带发育），这些沉积过程在强劲的北流底流和砂质沉积物供应下运行，其中丘丘地形对底栖水流和沉积路径的影响是明显的。相应的，底栖生物洋流路径和相关的沉积物输运也对碳酸盐丘表面形态和生长产生影响。巨大的土丘显示了沉积物波的过渡，随着珊瑚的增加，向土丘山顶的珊瑚群让位。较小的土丘特征（莫伊拉土丘）表明泥沙夹带是一个重要的土丘形成过程。
Carbonate mounds (up to 200 m high) formed from the accumulated remains of cold-water corals (principally Lophelia pertusa and Madrepora oculata), associated calcareous fauna and interstitial sediment are present at 500–1000 m water depths west of Ireland. Seabed mapping datasets (side-scan sonar, multibeam echosounder, sub-bottom profiler and underwater video imagery) are presented here from the Belgica Mound province on the eastern Porcupine Seabight margin. The data, integrated within a Geographic Information System (GIS), provide an environmental context to mound development. Analysis of this multidisciplinary dataset and resultant facies map highlight differing sedimentary processes (e.g., sediment wave, barchan dune, gravel lag and sand ribbon development) operating under strong northward flowing bottom currents with sandy sediment supply where the influence of mound topography on benthic currents and sediment pathways is evident. Correspondingly, benthic current pathways and associated sediment transport also exert an influence on carbonate mound surface morphology and growth. Giant mounds show a transition from sediment waves that, with increasing coral colonisation, give way to banks of coral towards the mound summits. Smaller mound features (Moira Mounds) show sand entrapment as an important mound-forming process.