| 北极东西伯利亚陆架沉积物物源:来自黏土矿物和化学元素的证据 |
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| 引用本文： | 李秋玲,乔淑卿,石学法,胡利民,陈禹飞,白亚之,朱爱美,崔菁菁.北极东西伯利亚陆架沉积物物源:来自黏土矿物和化学元素的证据[J].海洋学报,2021,43(3):76-89. |
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| 作者姓名： | 李秋玲 乔淑卿 石学法 胡利民 陈禹飞 白亚之 朱爱美 崔菁菁 |
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| 作者单位： | 1.自然资源部第一海洋研究所 自然资源部海洋地质与成矿作用重点实验室，山东 青岛 266061 |
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| 基金项目： | 山东省重大科技创新工程专项(2018SDK0104-3);国家自然科学基金(U1606401,41722603);自然资源部全球变化与海气相互作用专项(GASI-GEOGE-03)。 |
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| 摘 要： | 本文对北极东西伯利亚陆架表层沉积物进行了粒度、黏土矿物以及常微量元素测定，阐述了粒度、黏土矿物和常微量元素的分布特征。利用因子分析与聚类分析划分了不同的沉积区，并探讨了各区沉积物的主要来源。结果表明，研究区可以划分为4个沉积区:(1)东西伯利亚海近岸河口区(Ⅰ区)，沉积物以粉砂和砂质粉砂为主，TiO2、Zr、SiO2含量较高，其他元素在该区都处于低值，La/Th与Zr/Hf比值在4个沉积区中为最大值，黏土矿物中伊利石含量占绝对优势，约为70%，该区受到河流与海岸侵蚀物质输入的强烈影响；(2)东西伯利亚海中部(Ⅱ区)，沉积物以粉砂和泥为主，MnO、Ba与Ni等元素在该区含量较高，黏土矿物组合与Ⅰ区类似，La/Th和Zr/Hf比值比Ⅰ区略低，该区沉积物以河流输入的细粒沉积物为主，受海冰等过程的影响发生了混合，随着离岸距离的增加，海洋自生组分开始增多；(3)东西伯利亚海北部深水区(Ⅲ区)，沉积物以泥为主，Al2O3、K2O、V、Li等在该区达到最大值，La/Th和Rb/Th比值与Ⅱ区极其类似，伊利石含量在该区为最低值，蒙皂石与高岭石含量在该区达到最大值(>10%)，该区细粒沉积物很可能受大西洋水体以及波弗特环流的影响；(4)楚科奇海(Ⅳ区)，该区沉积物主要由粉砂和砂质粉砂组成，CaO、P2O5等在该区含量较高，Rb/Th、La/Th与Zr/Hf均为4个沉积区的最小值，绿泥石在该区最为富集，该区沉积物受太平洋入流水的影响强烈。
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| 关 键 词： | 沉积物物源 黏土矿物 常微量元素 东西伯利亚海 楚科奇海 |
| 收稿时间： | 2019-12-26 |
Sediment provenance of the East Siberian Arctic Shelf:Evidence from clay minerals and chemical elements |
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| Li Qiuling,Qiao Shuqing,Shi Xuefa,Hu Limin,Chen Yufei,Bai Yazhi,Zhu Aimei,Cui Jingjing.Sediment provenance of the East Siberian Arctic Shelf:Evidence from clay minerals and chemical elements[J].Acta Oceanologica Sinica (in Chinese),2021,43(3):76-89. |
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| Authors: | Li Qiuling Qiao Shuqing Shi Xuefa Hu Limin Chen Yufei Bai Yazhi Zhu Aimei Cui Jingjing |
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| Institution: | 1.Key Laboratory of Marine Geology and Metallogeny, First Institude of Oceanoraphy, Ministry of Natural Resources, Qingdao 266061, China2.Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China3.Key Laboratory of Coast and Island Development, Ministry of Education, Nanjing University, Nanjing 210023, China |
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| Abstract: | Grain size,clay minerals and major and trace elements of surface sediment samples collected from the East Siberian Arctic Shelf are analyzed.Based on factor analysis and cluster analysis the study area is divided into four provinces,the main sediment sources of each province are discussed.The results show that province I covers the estuary area of the Kolyma River and the Indigirka River.The sediments are mainly composed of silt and sandy silt,and characterized by higher content of SiO2,TiO2,Zr and low content of other elements.The ratios of La/Th and Zr/Hf reach the maximum in the four sedimentary areas.Illite is dominant which accounting for 70%of the whole clay minerals.This area is strongly influenced by terrestrial sources from the Kolyma River and the Indigirka River.Province II is located in the middle of the East Siberian Sea,where the sediments are generally silt and mud.The content of MnO,Ba,and Ni are relatively higher.La/Th and Zr/Hf ratio are slightly lower than that in Province I.Clay minerals composition is similar to Province I.The sediments in this area are mainly fine-grained derived by rivers,which are also influenced by sea ice process.As the distance increasing offshore,the content of marine authigenic components begin to increase.Province III is located in the northern East Siberian Sea,and sediments there are mainly mud.Elements such as Al2O3,K2O,V,Li reach the maximum value in this area.The La/Th and Rb/Th ratios are similar to those in the Province II.The content of illite is the lowest,semctite and kaolinite reach the maximum(>10%).Fine-grained sediments in this area are probably influenced by Atlantic waters and the Beaufort Gyre.Province IV is located in Chukchi Sea where the sediments consist of silt and sandy silt.Elements are characterized by higher contents of CaO,P2O5.The ratios of Rb/Th,La/Th and Zr/Hf are the minimum values,the content of chlorite reach peak(>20%).Sediments in this area are significantly influenced by the Pacific inflow water. |
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| Keywords: | sediment source clay mineral major and trace elements East Siberian Sea Chukchi Sea |
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