Pourbaix diagrams to decipher precipitation conditions of Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field

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	Pourbaix diagrams to decipher precipitation conditions of Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field
	Yang Baoju1,2 ; Zeng Zhigang 1; Wang Xiaoyuan 1; Yin Xuebo 1; Chen Shuai 1
刊名	ACTA OCEANOLOGICA SINICA
	2014-12-01
卷号	33 期号:12 页码:58-66
关键词	Si-Fe-Mn-oxyhydroxides PACMANUS hydrothermal field Pourbaix diagrams
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.
英文摘要	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.
学科主题	Oceanography
收录类别	SCI
语种	英语
WOS记录号	WOS:000346071800007
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/23836]
专题	海洋研究所_海洋地质与环境重点实验室
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
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.(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.