| 摘要: |
| 本文依据鸭绿江口主汊道采集的K1和K12柱状样，进行了常量元素的富集特征、相关系数、主成分分析及含量与特征参数垂向分布的讨论。研究表明：鸭绿江口属于涨潮三角洲，纳潮海湾泥质堆积区快速沉积的时间始于1960年。主汊道的沉积物具有多源性，K12柱状样受粒度控制显著，陆源碎屑为主；K1柱状样受粒度控制不显著，受海洋作用的影响较大。主汊道的沉积记录以1978年为界，分为上下2个沉积单元。主汊道的沉积物受到河口区水动力的强烈改造，与物源区的沉积物相比已经产生了很多的分异和变化。该研究通过对鸭绿江口主汊道常量元素沉积记录的分析，发现了近百年来该区域地貌演变和发育的规律，有效补充了鸭绿江口新生陆地形成过程的全貌。 |
| 关键词: 鸭绿江口 常量元素 沉积记录 |
| DOI：10.11759/hykx20210604001 |
| 分类号:P736.4 |
| 基金项目:国家自然科学基金项目（41876087） |
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| Characteristics and significance of the sedimentary records of the macroelements in the main branch of the Yalu River estuary |
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LIU Yue, CHENG Yan, LI Hong-jun, LI Fu-xiang
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Urban Construction College, Eastern Liaoning University, Dandong 118003, China
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| Abstract: |
| Two cores were collected from the main branch of the Yalu River estuary in this study.The enrichment characteristics,correlation coefficient,principal component,vertical distribution of the content,and characteristic parameters of the macroelements in the two cores were analyzed.Results showed that the Yalu River delta belonged to the flood tidal delta,and the mud accumulation areas in the tide bay began to form in 1960.The sediments in the main branch were multisource.The K12 core was controlled by the particle size,and terrigenous clast was dominant.By contrast,the K1 core was not controlled by the particle size and was considerably affected by the ocean currents.The sedimentary records of the main branch were divided into two sedimentary units by 1978.Strongly transformed by the estuarine hydrodynamics,the sediments in the main branch exhibited many differences and variations compared with the sediments in the source region.Through the analysis of the macroelement deposition records of in the main branch of the Yalu River estuary,the landform evolution rules in the region in the past hundred years were found,and the whole picture of the new land formation process of the Yalu River Estuary was further established. |
| Key words: Yalu River estuary macroelements sedimentary record |
