| GE Qian,XUE George Z,YE Liming,XU Dong,ZHAO Jianru,CHU Fengyou. 2019. The spatial distribution of major and trace elements of surface sediments in the northeastern Beibu Gulf of the South China Sea. Acta Oceanologica Sinica, 38(3):93－102 |
| The spatial distribution of major and trace elements of surface sediments in the northeastern Beibu Gulf of the South China Sea |
| 北部湾东北部表层沉积物主微量元素空间分布特征 |
| Received:February 12, 2018 |
| DOI：10.1007/s13131-019-1402-x |
| Key words:grain size major and trace elements Beibu Gulf spatial distribution sediment source |
| 中文关键词: 粒度 主微量元素 北部湾 空间分布 沉积物来源 |
| 基金项目:The National Programme on Global Change and Air-Sea Interaction of China under contract Nos GASI-GEOGE-03, GASI-04-01-02 and GASI-GEOGE-05; the National Natural Science Foundation of China under contract Nos 41476047, 41106045, 41506012 and 41206045. |
| Author Name | Affiliation | E-mail | | GE Qian | Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China | qge@sio.org.cn | | XUE George Z | Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA 70803, USA
Center for Computation and Technology, Louisiana State University, Baton Rouge, LA 70803, USA
Coastal Studies Institute, Louisiana State University, Baton Rouge, LA 70803, USA | | | YE Liming | Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China | | | XU Dong | Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China | | | ZHAO Jianru | Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China | | | CHU Fengyou | Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China | |
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| Abstract: |
| A multi-index analysis including grain size, major and trace elements is performed on the surface sediments from the northeastern Beibu Gulf to trace the sources of the sediments and to understand the controlling factors for elements distribution. The mean grain size exhibits a wide variation ranging from 0.09Φ to 8.05Φ with an average value of 5.33Φ. The average contents of major elements descend in an order of c(SiO2) > c(Al2O3) > c(Fe2O3) > c(CaO) > c(MgO) > c(K2O) > c(Na2O) > c(TiO2) > c(P2O5) > c(MnO), while those of trace elements exhibit a descending order of c(Sr) > c(Rb) > c(V) > c(Zn) > c(Cr) > c(Pb) > c(Ni) > c(Cu) > c(As). On the basis of elementary distribution characteristics and statistical analyses, the study area is divided into the four zones:Zone I is located in the northeastern coastal area of the gulf, which receives large amount of fluvial materials from local rivers in Guangxi and Guangdong, China, and the Qiongzhou Strait; Zone Ⅱ is located in the center of the study area, where surface sediments exhibits a multiple source; Zone Ⅲ is located in the Qiongzhou Strait, where surface sediments are dominated by materials from the Zhujiang River and Hainan; Zone IV is located in the southwest of the study area, where surface sediments are mainly originated from the Red River and Hainan. The statistical analyses of sediment geochemical characteristics reveal that the grain size, which is mainly influenced by hydrodynamics and mineral composition of terrigenous materials, is the leading factor controlling the elementary distribution. Meanwhile, impacts from anthropogenic activities and marine biogenic process will also be taken into consideration. |
| 中文摘要: |
| 对北部湾东北部的表层沉积物进行粒度和主微量元素分析，探讨沉积物来源与元素分布特征，并对分布特征的控制因素进行梳理。表层沉积物的平均粒径为0.09φ~8.05φ，平均值为5.33φ。主量元素的含量按降序分布为SiO2 > Al2O3 > Fe2O3 > CaO > MgO > K2O > Na2O > TiO2 > P2O5 > MnO，而微量元素的含量按降序分布为Sr > Rb > V > Zn > Cr > Pb > Ni > Cu > As。基于元素分布特征和数学统计分析，我们将研究区分为4个区：I区位于北部湾的东北部沿岸地区，该区堆积了大量来自广西和广东的河流物质，以及来自琼州海峡的物质；Ⅱ区位于研究区的中心，这里的表层沉积物显示出了多物源的特性；Ⅲ区位于琼州海峡附近，表层沉积物主要来自珠江以及海南岛；IV区位于研究区的西南，沉积物主要来自红河以及海南岛。通过地球化学元素的统计学分析我们发现，主要受到水动力条件和陆源物质矿物组成影响的粒度，是控制元素分布特征重要因素。另外，人类活动和海洋生物过程也会对元素分布特征产生影响。 |
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