| 渤海东部与黄海北部表层沉积物的元素地球化学记录 |
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| 引用本文：蓝先洪,李日辉,张志珣,王中波,秦亚超,陈晓辉.2015.渤海东部与黄海北部表层沉积物的元素地球化学记录[J].地球学报,36(6):718-728. |
| DOI：10.3975/cagsb.2015.06.04 |
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| 基金项目:Element Geochemistry Records of Surface Sediments in the East of the Bohai Sea and the Northern Yellow Sea |
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| 中文摘要:为研究渤海东部及黄海北部海域沉积物常量元素组成特征及与物源的关系, 分析了该海域138个站位沉积物样品的常量元素含量。渤海东部及黄海北部海域沉积物常量元素Al2O3、MgO、Na2O和TFe2O3分布基本相似; SiO2分布与Al2O3、MgO、Na2O和TFe2O3分布相反; Al2O3、MgO、TFe2O3、TiO2和Na2O等元素与细粒沉积物呈正相关, SiO2与粗粒沉积物呈正相关, CaO、CaCO3、MnO和K2O分布与沉积物粒度无明显正或负的相关性; 北黄海东部K2O分布反映了鸭绿江物质的影响。R-型聚类分析得出3种组合类型, 以MgO、CaO和K2O及MnO为代表, 分别对应反映陆源细粒物质输入、指示黄河和鸭绿江物质的影响和海洋自生作用。依据Q-型聚类分析特征, 将调查海域沉积物划分为4个不同的地球化学分区, 同时综合分析得出了Ⅰ区、Ⅱ区、Ⅲ区和Ⅳ区的沉积物运移的路径趋势。K2O/CaO揭示黄河物质影响自南至北和自西向东呈逐渐减弱的趋势, 其中研究区西南部和北黄海中西部受黄河物质影响较强, 北黄海东部沉积物更多受鸭绿江物质影响。 |
| 中文关键词:渤海东部 黄海北部 常量元素 地球化学 物源 |
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| Element Geochemistry Records of Surface Sediments in the East of the Bohai Sea and the Northern Yellow Sea |
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| Abstract:The major element abundances of the sediment samples collected from 138 stations were analyzed with the purpose of studying the distribution of the major elements in the sediments and their relations with the provenance in the east part of the Bohai Sea and the northern Yellow Sea. The Al2O3, MgO, Na2O and TFe2O3 have similar distribution patterns, whereas SiO2 is negatively correlated with these oxides in the east part of Bohai Sea and the northern Yellow Sea. The Al2O3, MgO, TFe2O3, TiO2 and Na2O elements are positively correlated with the fine-grained sediments, and SiO2 is positively correlated with coarse-grained sediments; there is no significant positive or negative correlation between CaO, CaCO3, MnO and K2O distribution and grain sizes of sediments; the K2O distribution in the eastern part of the North Yellow Sea reflects the impact of the Yalu River material. R-mode cluster analysis indicates three combinations of types that are represented by MgO, CaO and K2O, MnO, respectively, reflecting the input of terrigenous fine-grained material, the impact of the Yellow River and the Yalu River substances, and marine authigenesis, respectively. According to the Q-mode cluster analysis, the geochemical characteristics of the investigation area are divided into four different sediment geochemical subareas. In addition, the authors also obtained the sediment transport trends and routes in theⅠ, Ⅱ, Ⅲ and Ⅳ regions. K2O/CaO ratios show that the effect of the Yellow River substances is gradually weakened from the south to the north and from the west to the east, the sediments in the southwest of the study area and in the middle-west parts of the North Yellow are strongly impacted by the Yellow River substances, and the sediments in the east of the North Yellow Sea are more seriously affected by the Yalu River substances. |
| keywords:eastern Bohai Sea northern Yellow Sea major elements geochemistry provenance |
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