| Wang Xiaojing,Li Li,Liu Jihua,Wu Yonghua,Gao Jingjing,Cao Peng,Zhang Ying,Shi Xuefa. 2019. Early diagenesis of redox-sensitive trace metals in the northern Okinawa Trough. Acta Oceanologica Sinica, 38(12):14－25 |
| Early diagenesis of redox-sensitive trace metals in the northern Okinawa Trough |
| 冲绳海槽北部氧化还原敏感元素的早期成岩过程 |
| Received:September 27, 2018 |
| DOI：10.1007/s13131-019-1512-5 |
| Key words:diagenesis molybdenum uranium vanadium pore water sediment Okinawa Trough |
| 中文关键词: 早期成岩过程 钼 铀 钒 孔隙水 沉积物 冲绳海槽 |
| 基金项目:The National Key Basic Research Program of China under contract No. 2013CB429704; the NSFC-Shandong Joint Fund for Marine Science Research Centers under contract No. U1606401; the National Natural Science Foundation of China under contract No. 41776095; the National Program on Global Change and Air-Sea Interaction under contract No. GASI-GEOGE-03. |
| Author Name | Affiliation | E-mail | | Wang Xiaojing | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Li Li | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
1. Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | Li.Li@fio.org.cn | | Liu Jihua | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China | | | Wu Yonghua | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Gao Jingjing | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Cao Peng | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Zhang Ying | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Shi Xuefa | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China | |
|
| Hits: 1480 |
| Download times: 953 |
| Abstract: |
| The early diagenesis processes of several redox-sensitive trace metals (RSMs) (Mo, U and V) were studied with several short sediment cores (~25 cm) collected in the northern Okinawa Trough (OT). Pore water vertical profiles indicated that the sedimentary environments in all cores were between oxic and suboxic, not yet reaching anoxic sulfidic conditions. The recycling process of Mo in sediments was clearly associated with Mn and yielded little authigenic accumulation, while U showed a downcore increase in sediment and its authigenic mass accumulation rate (MAR) was estimated to be ~23% of the Changjiang (Yangtze) and Huanghe (Yellow) riverine flux. Benthic diffusive fluxes and MAR were calculated and the comparison of them showed that U and V fluxes matched relatively well both in direction and in magnitude, implying that diffusion processes at the sediment-water interface is the dominant process controlling the remobilization or burial of V and U in northern OT. This work provided a systematic study (both in pore water and solid phase) on the RSMs geochemical behaviors during early diagenesis process, yielding a quantitative assessment of the remobilization or burial fluxes of the RSMs in northern OT. Such studies are in general lacking in the coastal margin of Northwest Pacific Ocean. |
| 中文摘要: |
| 本文利用冲绳海槽北部的5根沉积物短柱（~25 cm），对氧化还原敏感元素（Mo、U、V）在早期成岩过程中的地球化学行为进行了系统的研究，探讨了影响其分布的主控因素，并定量估算了其在沉积物-海水界面扩散通量和沉积物中的自生累积埋藏通量，为阐明西北太平洋边缘海地区氧化还原敏感元素的早期成岩过程提供了科学依据。结合孔隙水及沉积物中Fe、Mn、Mo、U和V的垂向分布结果发现，所有沉积物短柱的沉积环境介于氧化和次氧化之间，直到短柱底部均未达到缺氧环境。Mo的早期成岩受到Mn氧化物地球化学循环过程的影响，在沉积物中基本没有自生累积。U在沉积物短柱的含量随着深度的增加而增加，自生累积通量（MAR）约为长江和黄河输入量的23%左右。沉积物-海水扩散通量与沉积物自生累计通量对比发现，U为向下扩散进入沉积物，而V为向上扩散进入上覆水体，扩散通量的方向和大小与自生累积通量基本一致，说明扩散过程是控制U和V在沉积物中埋藏或者迁移的主要因素。 |
|
HTML
View Full Text
View/Add Comment Download reader |
| Close |
|
|
|
