Similarity measurement algorithm of REE distribution curve and its application for provenance discrimination of sediments in the Yellow Sea
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摘要:
稀土元素配分曲线常被用于判别沉积物物源，相同物源沉积物的稀土元素配分曲线往往具有相似的形态特征。然而，当前稀土元素配分曲线相似性判别仍然采用人眼目视判别，主观性较强且无法实现定量判别，因此需要一种统一的度量手段实现稀土元素配分曲线的定量相似度计算，进而在此基础上开展聚类、分类等统计分析操作，充分挖掘稀土元素数据中的物源信息。本研究提出一种稀土元素配分曲线相似性度量算法，该算法不受稀土元素绝对丰度的影响，能够有效甄别稀土元素配分曲线之间形态上的差异。该算法的聚类结果显示，黄河和长江是南黄海中部泥质区的主要物质来源，黄河黏土粒级物质可以由沿岸流输运至黄海33°N处，长江黏土粒级物质被黄海暖流携带北上最远至黄海36°N附近，西朝鲜海洋锋面将朝鲜半岛河流的影响范围限制在了其东侧；东南黄海泥质区除了接收朝鲜半岛河流的供给外，其南部还接收了中国河流的细粒物质供应。
Abstract:Rare earth element (REE) distribution curves are often used to specify sediments provenance. The REE distribution curves of sediments from the same source are often similar in shape. However, currently, the similarity discrimination of REE distribution curves still relies on visual discrimination by the human eye, which is highly subjective and cannot achieve quantitative discrimination. Therefore, a unified measurement method is needed to realize the quantitative calculation of the similarity of REE distribution, based on which statistical analyses such as clustering and classification were carried out and the information of provenance in REE perspectives was fully explored. An algorithm for measuring the similarity was proposed, and it is independent of the absolute abundance of REE and can effectively map the differences in the shape of REE distribution curves. The clustering results based on this algorithm show that the Yellow River and the Yangtze River are the main provenances of the muddy area in the central part of the South Yellow Sea. The Yellow River clay fractions can be transported to 33 °N of the Yellow Sea by alongshore current, while the Yangtze River clay fractions be carried northward by the Yellow Sea Warm Current as far as to 36 °N of the Yellow Sea. The West Korea Coastwise Front limits the influence of the rivers in the Korean Peninsula to its east. In addition to receiving the supply from the rivers in the Korean Peninsula, the southeast Yellow Sea mud also receives the supply of fine-grained sediments from Chinese rivers.
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Key words:
- rare earth element /
- REE distribution curve /
- provenance /
- similarity measurement /
- clustering
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表 1 各河流沉积物稀土元素配分曲线的相似度
Table 1. The similarity of curves in REE distribution of sediments among different rivers
长江 黄河 鸭绿江 汉江 锦江 荣山江 长江 1.0 0.667 4 0.076 8 0.109 5 0.131 3 0.136 8 黄河 0.667 4 1.0 0.060 2 0.090 6 0.131 3 0.116 0 鸭绿江 0.076 8 0.060 2 1.0 0.101 4 0.174 2 0.154 5 汉江 0.109 5 0.090 6 0.101 4 1.0 0.524 1 0.475 9 锦江 0.131 3 0.116 2 0.174 2 0.524 1 1.0 0.611 5 荣山江 0.136 8 0.116 0 0.154 5 0.475 9 0.611 5 1.0 
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表 2 各河流沉积物稀土元素数据的欧式距离
Table 2. The Euclidean distance of REE data of sediments among different rivers
长江 黄河 鸭绿江 汉江 锦江 荣山江 长江 0 0.937 5 1.176 0 2.001 6 1.158 1 0.898 0 黄河 0.937 5 0 2.044 3 2.682 0 1.590 2 0.797 5 鸭绿江 1.176 0 2.044 3 0 1.543 0 1.476 9 1.769 5 汉江 2.001 6 2.682 0 1.543 0 0 1.201 3 2.032 1 锦江 1.158 1 1.590 2 1.769 5 1.201 3 0 0.882 9 荣山江 0.898 0 0.797 5 1.769 5 2.032 1 0.882 9 0
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