Glacigenic and associated marine sediments in the Weddell Sea, fjords of Spitsbergen and the Barents Sea: a review
Glacigenic and associated marine sediments in the Weddell Sea, fjords of Spitsbergen and the Barents Sea: a review
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威德尔海、斯匹次卑尔根峡湾和巴伦支海的冰川形成和相关海洋沉积物：综述
DOI：
10.1016/0025-3227(84)90195-6
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发表时间：
1984
期刊：
影响因子：
2.9
通讯作者：
A. Elverhøi
中科院分区：
文献类型：
--
作者：
A. Elverhøi
对威德尔海、斯匹次卑尔根峡湾和巴伦支海冰川成因和相关海洋沉积物的研究表明，在冰川覆盖有限（间质）期间，大量物质可能会被带入海洋，主要是融水。主要载荷以 5–10 cm yr−1 的速率沉积在相对靠近冰前（<10 km）的地方。在冰川范围最大时，接地冰延伸到陆架上，以陆架边缘为外部界限，陆地和内陆架区域受到侵蚀。主要的冰川沉积场所是外陆架和陆架边缘。冰架外沉积环境的特点是碎屑供应量少，主要由冰山沉积。由于低浊度和营养丰富的水的供应，生物物质积累，形成富含生物碎屑的冰川序列。海平面下降导致冰架搁浅并向海扩展。随后的海平面上升导致接地的冰漂浮。冰川消退和海平面上升减少了碎屑输入到冰架上。冰川沉积物被改造，碳酸盐可能积累，形成冰屑岩-碳酸盐序列（例如晚前寒武纪）。巴伦支海冰盖等海洋冰盖的破裂似乎是逐步发生的，是对海平面上升和气候变化的反应。
Studies of glacigenic and associated marine sediments in the Weddell Sea, fjords of Spitsbergen and Barents Sea show that during periods of limited glacial coverage (interstadials) large amounts of material may be brought into the sea, mainly by meltwater. The major load is deposited relatively close to the icefront (<10 km) at a rate of 5–10 cm yr−1.At times of maximum glacial extent, grounded ice extends onto the shelf with the shelf edge as the outer limit, and land and inner shelf areas are eroded. Main glacial depositional sites are then the outer shelf and shelf edge.The sedimentary environment outside an ice shelf is characterized by low clastic supply, mainly deposited from icebergs. Due to low turbidity and a supply of nutrient-rich water, biogenic matter accumulates, leading to a glaciomarine sequence rich in bioclastics. Sea-level lowering results in grounding and seaward expansion of the ice shelf. Subsequent eustatic rise causes the grounded ice to float.Deglaciation and sea-level rise reduces clastic input to the shelves. Glacial sediments are reworked, and carbonates may accumulate, forming tillite-carbonate sequence (e.g. Late Precambrian). Break-up of marine ice sheets such as the Barents Sea ice sheet seems to have taken place stepwise, in response to eustatic rise and climatic changes.