西太平洋深水盆地海水及孔隙水的微量元素地球化学特征

邓义楠; 任江波; 郭庆军; 王海峰; 于哲; 刘晨晖

doi:10.3799/dqkx.2017.562

西太平洋深水盆地海水及孔隙水的微量元素地球化学特征

doi: 10.3799/dqkx.2017.562

邓义楠^1,2,,
任江波^1,2,
郭庆军^3, ,,
王海峰^1,2,
于哲^1,2,
刘晨晖⁴

1.
自然资源部海底矿产资源重点实验室, 广东广州 510075
2.
广州海洋地质调查局, 广东广州 510075
3.
中国科学院地理科学与资源研究所, 北京 100101
4.
南京大学内生金属矿床成矿机制研究国家重点实验室, 地球科学与工程学院, 江苏南京 210008

基金项目:

国家自然科学基金项目 41702096

国土资源部海底矿产资源重点实验室项目 KLMMR-2015-A-03

国际海域资源调查与开发“十三五”课题 DY135-C1-1-04

国家自然科学基金项目 41803026

中国地质调查局项目 DD20190629

国际海域资源调查与开发“十三五”课题 DY135-R2-1-05

国家杰出青年基金项目 41625006

详细信息

作者简介:
邓义楠(1987-), 男, 工程师, 主要从事海洋地球化学研究

通讯作者:
郭庆军, E-mail:guoqj@igsnrr.ac.cn

中图分类号: P595
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- 被引次数: 0
出版历程
- 收稿日期: 2017-02-09
- 刊出日期: 2019-09-15

Trace Elements Geochemistry Characteristics of Seawater and Porewater in Deep-Water Basin, Western Pacific

Deng Yinan^{1,2
,},
Ren Jiangbo^1,2,
Guo Qingjun^{3
, ,},
Wang Haifeng^1,2,
Yu Zhe^1,2,
Liu Chenhui⁴

1.
Key Laboratory of Marine Mineral Resources of Ministry of Natural Resources, Guangzhou 510075, China
2.
Guangzhou Marine Geological Survey, Guangzhou 510075, China
3.
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
4.
State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210008, China

摘要

摘要: 关于西太平洋海山区深水盆地海水和孔隙水的地球化学特征，及其对该海域多金属结核生成的影响的研究至今仍比较缺乏.对西太平洋海山区的深海盆地进行海水和孔隙水的系统采样，分析了海水的化学特征以及海水和孔隙水的微量元素特征.结果显示：海水的DO和pH随水深增加呈逐渐下降再上升的趋势，而SiO₃^2-、NO₃^-和PO₄^3-的变化特征与其相反；微量元素在海水中的变化特征与上述营养盐相似，海水-沉积物界面表现出溶解态微量元素含量的极大富集，而在3~5 cm处的微弱上升可能与自生物质分解有关.以上表明大洋底层海水金属元素的富集与生物作用相关，是导致普遍氧化的表层沉积物之上多金属结核富集的主控因素；相对于其他海域，研究区域碎屑物质溶解产生的Sc、Cr、Ni、Pb以及大量的Cu、Co等金属元素可能对结核的生长起到重要的促进作用.
- 微量元素 /
- 地球化学 /
- 海水 /
- 孔隙水 /
- 元素迁移 /
- 多金属结核 /
- 西太平洋
Abstract: The geochemical characteristics of seawater and porewater in the deep-water basin of western Pacific and its impact on the formation of polymetallic nodules in the sea are still lacking. Seawater and porewater samples were systematically collected in western Pacific. We analyzed the hydro-chemical characteristics in seawater and trace elements in seawater and porewater. The results indicate that DO and pH values show a decrease followed by a rise with depth, whereas SiO₃^2-, NO₃^- and PO₄^3- values exhibit the reverse change trend. The variations of trace elements in seawater show a same trend with nutrient values. Trace metals in porewater are enriched in seawater-sediment interface, and then this concentration increases by degradation of authigenic material located in 3-5 cm in surface sediment. We suggest that relatively high concentration of trace metals in bottom seawater was derived from biological process, and it led to enrichment of polymetallic nodule on extensive oxic surface sediment. Compared to other areas, metal elements (Sc, Cr, Ni, Pb, especially Cu and Co) which were dissolved from detrital component, might play a key role in nodule growth in western Pacific.
- trace element /
- geochemistry /
- seawater /
- porewater /
- migration of trace elements /
- polymetallic nodule /
- western Pacific

HTML全文

图 1 西太平洋海山区研究区位置

Fig. 1. Location of the study area in the seamount region, western Pacific

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图 2 海水水化学特征变化情况

单位中M为mol/L

Fig. 2. Variations of hydro-chemical characteristics of seawater

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图 3 海水和孔隙水的微量元素和pH的变化特征

Fig. 3. Variations of trace elements and pH in seawater and porewater

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图 4 孔隙水中Al与金属元素的相关关系

Fig. 4. The relationship between Al and trace metals in porewater

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图 5 孔隙水中自生物质的微量元素变化情况

Fig. 5. Variations of trace elements from authigenic materials in porewater

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图 6 溶解态微量元素在研究区的迁移模式

Fig. 6. Mobility model of dissolved trace elements in the study area

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图 7 不同海域沉积物孔隙水的微量元素变化特征对比

Fig. 7. The comparison of trace element concentrations of porewater in different sea areas

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