| 摘要: |
| 利用沉析法和筛析法及显微镜等方法，对1988年以来采自南黄海表层和浅孔样品进行粒度、矿物及生物组合等多种分析，应用沉积物的粒度参数来判别沉积环境。研究结果表明，南黄海陆架的沉积环境十分复杂，在其中部，有一个低能量的沉积动力活动区，它的各种属性都与南黄海冷水团密切相关。这一低能沉积环境，形成了浅海粉砂质粘土相沉积，该沉积物主要由细粒物质组成，平均粒径为8.5Φ；粘土组分的含量＞70％：含海相沟鞭藻和双壳类等生物，并含有丰富的自生黄铁矿。这些特征表明，浅海粉砂质粘土相是南黄海陆架沉积模式的重要部分，是浅海陆架沉积环境研究领域不可忽视的对象。 |
| 关键词: 低能沉积环境 粒度参数 南黄海 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，4937626号 |
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| LOW ENERGY ENVIRONMENT OF THE CENTRAL SOUTH YELLOW SEA |
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Shen Shunxi, Li Anchun, Yuan Wei
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Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071
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| Abstract: |
| Multiple analyses were conducted on the grain-size and mineral and biological assemblages of surface and core sediments sampled from the South Yellow Sea since 1988. The results using sedimentary the grain-size parameter to reflect sedimentary environment showed that the sedimentary environment on the continental shelf of the South Yellow Sea is very complicated. There is a low energy region of sedimentation dynamics in the central part. The low energy sedimentary environment led to the formation of the special neritic silty clay deposits. The sediments were mainly composed of fine material (mean size is 8.5 (Φ), in which clay content occupied more than 70%, sand content was less than 1% and the rest was silt. The sediments contained marine facies Dinoflagellates, Bivalvia and abtmdant authigenic pyrite. These characteristics suggested that the neritic silty clay facies is an important part of the sedimentary pattern on the Southern Yellow Sea shelf and their main sources were homogeneous suspensions in the cyclonic eddy system for the clay fraction, the surrounding sediments of the system for the silty sediment and authigenic pyrite for the very small fine sand fraction. |
| Key words: Low energy environment, Grain size parameter, South Yellow Sea |
