Pourbaix diagrams to decipher precipitation conditions of Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field
文献类型：CNKI期刊论文
| 作者 | YANG Baoju ; ZENG Zhigang; WANG Xiaoyuan; YIN Xuebo; CHEN Shuai
|
| 发表日期 | 2014-12-15 |
| 出处 | Acta Oceanologica Sinica
 |
| 关键词 | Si-Fe-Mn-oxyhydroxides,PACMANUS hydrothermal field,Pourbaix diagrams |
| 英文摘要 | Utilizing Si, Fe and Mn concentrations within the end-member PACMANUS hydrothermal fluid, Si-Fe-MnH_2 O Pourbaix diagrams were constructed at 300°C and 25°C. The Pourbaix diagrams show that the main Si, Fe and Mn oxides species precipitating from the hydrothermal fluid were Si O_2, Fe(OH)_3, Fe_3(OH)_8, Mn_3O_4, and Mn_2O_3 at 25°C. During mixing of hydrothermal fluid with seawater, Si O_2 precipitated earlier than FeMn-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 Mn_3O_4 and Mn_2O_3 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 p H 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 p H 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 p H, Fe(OH)_3 was easily precipitated from the solution and distributed around the Si-rich core. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | The National Key Basic Research Program of China under contract Nos 2013CB429700 ; the National Special Fund for the 12th Five Year Plan of COMRA under contract Nos DY125-12-R-02 and DY125-12-R-05 ; the National Natural Science Foundation of China under contract Nos 41325021,40830849,40976027 and 41476044 ; the Shandong Province Natural Science Foundation of China for Distinguished Young Scholars under contract Nos JQ200913 ; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No.XDA11030302 ; the CAS/SAFEA International Partnership Program for Creative Research Teams |
| 卷 | v.33期:12页:60-68 |
| 语种 | 英文; |
| 分类号 | P736;P744 |
| ISSN号 | 0253-505X |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/190204]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.UniversityofChineseAcademyofSciences 2.SeafloorHydrothermalActivityLaboratoryoftheKeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences |
| 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. 2014. |
入库方式： OAI收割
来源：海洋研究所
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