| 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 |
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| 引用本文： | 邓义楠,任江波,郭庆军,王海峰,于哲,刘晨晖.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[J].地球科学,2019,44(9):3101-3114. |
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| 作者姓名： | 邓义楠 任江波 郭庆军 王海峰 于哲 刘晨晖 |
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| 作者单位： | 1.自然资源部海底矿产资源重点实验室, 广东广州 510075 |
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| 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 |
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| 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SiO32-、NO3-和PO43-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.
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| 关 键 词： | 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 |
| 收稿时间： | 2017-02-09 |
Trace Elements Geochemistry Characteristics of Seawater and Porewater in Deep-Water Basin,Western Pacific |
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| 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 SiO32-, NO3- and PO43- 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. |
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