陆架环流作用下的北黄海中北部细颗粒物质输运

石勇; 高建华; 刘强; 艾乔; 盛辉; 汪亚平; 李军; 白凤龙

doi:10.3969/j.issn.0253-4193.2019.04.005

陆架环流作用下的北黄海中北部细颗粒物质输运

doi: 10.3969/j.issn.0253-4193.2019.04.005

石勇¹,
高建华^1,,
刘强¹,
艾乔¹,
盛辉¹,
汪亚平²,
李军³,
白凤龙³

1.
南京大学地理与海洋科学学院, 江苏南京 210023
2.
南京大学地理与海洋科学学院, 江苏南京 210023;华东师范大学河口海岸学国家重点实验室, 上海 200062
3.
青岛海洋地质研究所, 山东青岛 266071

基金项目: 国家自然科学基金（41576043；41476052）；国家杰出青年科学基金（41625021）。

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出版历程
- 收稿日期: 2018-03-19
- 修回日期: 2018-05-17

Fine sediment transport in north-central of Yellow Sea: the role of continental shelf circulation

1.
School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
2.
School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
3.
Qingdao Institute of Marine Geology, Qingdao 266071, China

摘要

摘要: 海洋泥质沉积是流域、古气候及海平面变化信息的重要载体，对该粒级物质的系统研究，是获取环境信息的重要手段。为此，采集北黄海中北部表层沉积物80件，经室内筛分处理，并对细颗粒组分（<63 μm）进行了稀土元素（REE）测试。结果显示REE的含量及分布模式在长山列岛东西两侧差异显著：东侧物质明显富集REE，尤其轻稀土元素（LREE），Eu元素则明显缺失，指示了受鸭绿江的显著控制；长山列岛以西，REE除含量降低外，分布模式也变平缓。造影剂马根维显（Gd-DTPA）在磁共振成像（MRI）中的大量使用，可能是造成Gd明显富集的主要原因。此外，辽南沿岸物质的来源及分布与以往认识存在差异，以往认为辽南沿岸泥质沉积为鸭绿江为主的辽东半岛河流的远端泥沉积，而本文的研究发现：辽东半岛东侧长山列岛至大连湾外海域以黄河来源物质为主，鸭绿江物质对北黄海西部泥质区的贡献在西侧大于东侧，其中陆架环流对物质输运发挥着重要作用。
- 稀土元素(REE) /
- 泥质沉积 /
- 陆架环流 /
- 黏土矿物 /
- 北黄海
Abstract: Marine mud sediment contains huge quantities of information concerning with catchment change, climate change and environment evolution. Therefore, analyzing the fine grain sized fraction of sediment is a crucial method to extract environment evolution information. The surficial sediments collected from north-central of the North Yellow Sea (NYS) were sieved and the fine fraction (<63 μm) were tested for rare earth elements (REE). The test results indicate that, as bounded by Changshan Islands, the discrepancies of REE concentration and distribution patterns between the east and west sediments of the mud deposition of the eastern Liaodong Peninsula (MDELP) was observed. The sediments in east of Changshan Islands, dominated by Yalu River, are defective in Eu and rich in REE, especially in light rare earth elements (LREE). However, the REE contents are low in the west side of Changshan Island and their distribution patterns are flat. Meanwhile, attributing to the wildly use of contrast agent (Gd-DTPA) in the Magnetic Resonance Imaging (MRI), the Gd in the sediment of the study area is obviously enriched. Furthermore, new recognition concerning with the sediment transport and origin is acquired: previous study believed the sediment source of MDELP is mainly derived from the Yalu River. However, our research reveals that, due to the transport of shelf circulation, there exists sediment exchange between the MDELP and the mud deposition of the west NYS: the sediment source in east of MDELP is controlled by the Yalu River, and that in the west of MDELP is mainly dominated by the Yellow River; in addition, Yalu River-derived sediment is supplied to the mud deposition of the west NYS.
- rare earth elements (REE) /
- mud deposition /
- shelf circulation /
- clay mineral /
- North Yellow Sea

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