Pourbaix diagrams to decipher precipitation conditions of Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field | |
Yang Baoju1,2; Zeng Zhigang1; Wang Xiaoyuan1; Yin Xuebo1; Chen Shuai1; Zeng, ZG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Activ Lab, Qingdao 266071, Peoples R China. | |
2014-12-01 | |
发表期刊 | ACTA OCEANOLOGICA SINICA |
卷号 | 33期号:12页码:58-66 |
文章类型 | Article |
摘要 | Utilizing Si, Fe and Mn concentrations within the end-member PACMANUS hydrothermal fluid, Si-Fe-Mn-H2O Pourbaix diagrams were constructed at 300A degrees C and 25A degrees C. The Pourbaix diagrams show that the main Si, Fe and Mn oxides species precipitating from the hydrothermal fluid were SiO2, Fe(OH)(3), Fe-3(OH)(8), Mn3O4, and Mn2O3 at 25A degrees C. During mixing of hydrothermal fluid with seawater, SiO2 precipitated earlier than Fe-Mn-oxyhydroxides because of the lower stability boundary. Then Fe(OH)(2) precipitated first, followed by Fe-3(OH)(8) and Fe(OH)(3), and last, small amounts of Mn3O4 and Mn2O3 precipitated. Fe(OH)(3) was readily deposited in alkaline solution with little influence by Eh. There were many Si-Fe-Mn-concentric particles in the polished sections of the massive precipitates collected from PACMANUS. In the concentric nucleus and ellipsoid, Si oxides precipitated first before the hydrothermal fluid had mixed with seawater. In the concentric nucleus, after the precipitation of Si oxides, the increase of pH and Eh promoted the precipitation of Mn oxides around the Si oxides. In the large ellipsoid, the precipitation of Fe was divided into two periods. In the early period, increase of pH value of hydrothermal fluid produced by low-temperature convection and an input of a small volume of seawater promoted a small amount of Fe(OH)(3) to precipitate in the Si-rich core. In the late period, after complete mixing with seawater and the resultant fluid was close to neutral or slightly alkaline in pH, Fe(OH)(3) was easily precipitated from the solution and distributed around the Si-rich core. |
关键词 | Si-fe-mn-oxyhydroxides Pacmanus Hydrothermal Field Pourbaix Diagrams |
学科领域 | Oceanography |
DOI | 10.1007/s13131-014-0572-9 |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000346071800007 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.qdio.ac.cn/handle/337002/23836 |
专题 | 海洋地质与环境重点实验室 |
通讯作者 | Zeng, ZG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Activ Lab, Qingdao 266071, Peoples R China. |
作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Activ Lab, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
第一作者单位 | 中国科学院海洋研究所 |
推荐引用方式 GB/T 7714 | Yang Baoju,Zeng Zhigang,Wang Xiaoyuan,et al. Pourbaix diagrams to decipher precipitation conditions of Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field[J]. ACTA OCEANOLOGICA SINICA,2014,33(12):58-66. |
APA | Yang Baoju,Zeng Zhigang,Wang Xiaoyuan,Yin Xuebo,Chen Shuai,&Zeng, ZG .(2014).Pourbaix diagrams to decipher precipitation conditions of Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field.ACTA OCEANOLOGICA SINICA,33(12),58-66. |
MLA | Yang Baoju,et al."Pourbaix diagrams to decipher precipitation conditions of Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field".ACTA OCEANOLOGICA SINICA 33.12(2014):58-66. |
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