Mineralogical characterization and formation of Fe-Si oxyhydroxide;deposits from modern seafloor hydrothermal vents

doi:10.2138/am.2013.4147

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质调查局青岛海洋地质研究所

	Mineralogical characterization and formation of Fe-Si oxyhydroxide;deposits from modern seafloor hydrothermal vents
	Sun, Zhilei 7; Zhou, Huaiyang 2; Glasby, G. P.; Sun, Zhixue 3; Yang, Qunhui 2; Yin, Xijie 4; Li, Jiwei 5
刊名	AMERICAN MINERALOGIST
	2013
卷号	98 期号:1 页码:85-97
关键词	Lau Basin hydrothermal Fe-Si oxides banded iron formations neutrophilic Fe-oxidizing bacteria
ISSN号	0003-004X;EI 1945-3027
DOI	10.2138/am.2013.4147
英文摘要	We have studied mineralogical characteristics of Fe-Si oxide precipitates from hydrothermal fields of the Valu Fa Ridge, Lau Basin, especially the role that the neutrophilic Fe-oxidizing bacteria played in their formation, using various analytical techniques (XRD, SEM, EPMA, TG/DTA, and FTIR). According to this examination, the Fe-Si oxide formation can be divided into two stages. At the initial stage, the Fe-oxidizing bacteria bound and oxidized Fe2+ into Fe3+ to fix CO2, triggering precipitation of Fe-oxyhydroxide (ferrihydrite) and construction of a loose network of Fe-rich filaments. Subsequently, the decreased porosity of the network resulting from the gradual growth of the filaments led to a decline in the mixing between seawater and the hydrothermal fluids. Then the conductive cooling of the network resulted in saturation of the dissolved Si with respect to amorphous silica. As a result, significant precipitation of opal-A occurred through inorganic polymerization. However, part of the silica was immobilized by bonding to Fe-OH functional groups and yielded unpolymerized silica, which is characterized by Fe-O-Si bond. Owing to the incorporation of Si into the ferrihydrite structure and its adsorption on the ferrihydrite surface, the modern hydrothermal Fe-Si oxides are thermally stable. DSC measurements indicate the full segregation of cristobalite from hematite at about 800 degrees C in an O-2 atmosphere. These observations indicate that primary alternating Si- and Fe-rich layers may be absent in the Archean ocean and that alternating bands in BIFs represent a diagenetic process; our work thus provides a potential clue that can be used to unravel the precipitation and diagenetic mechanisms of Precambrian banded iron formations (BIF).
学科主题	海洋地质学
WOS关键词	DE-FUCA RIDGE ; BACK-ARC BASIN ; NORTHEAST PACIFIC-OCEAN ; BANDED-IRON-FORMATIONS ; YELLOWSTONE-NATIONAL-PARK ; LAU BASIN ; SYNTHETIC ; FERRIHYDRITE ; AXIAL-VOLCANO ; HOT-SPRINGS ; SPREADING CENTER
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	MINERALOGICAL SOC AMER
WOS记录号	WOS:000313148500009
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39937]
专题	中国地质调查局青岛海洋地质研究所
作者单位	1.[Sun, Zhilei; Glasby, G. P.] Minist Land & Resources, Key Lab Marine Hydrocarbon Resources & Environm G, Qingdao 266071, Peoples R China. 2.Sun, Zhilei; Glasby, G. P.] Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China. 3.Tongji Univ, Sch Ocean & Earth Sci, Shanghai 200092, Peoples R China. 4.China Univ Petr, Sch Petr Engn, Qingdao 266555, Peoples R China. 5.Third Inst Oceanog State Ocean Adm, Xiamen 361005, Peoples R China. 6.SW Jiaotong Univ, Fac Geosci & Environm Engn, Chengdu 614202, Peoples R China. 7.中国地质调查局青岛海洋地质研究所
推荐引用方式 GB/T 7714	Sun, Zhilei,Zhou, Huaiyang,Glasby, G. P.,et al. Mineralogical characterization and formation of Fe-Si oxyhydroxide;deposits from modern seafloor hydrothermal vents[J]. AMERICAN MINERALOGIST,2013,98(1):85-97.
APA	Sun, Zhilei.,Zhou, Huaiyang.,Glasby, G. P..,Sun, Zhixue.,Yang, Qunhui.,...&Li, Jiwei.(2013).Mineralogical characterization and formation of Fe-Si oxyhydroxide;deposits from modern seafloor hydrothermal vents.AMERICAN MINERALOGIST,98(1),85-97.
MLA	Sun, Zhilei,et al."Mineralogical characterization and formation of Fe-Si oxyhydroxide;deposits from modern seafloor hydrothermal vents".AMERICAN MINERALOGIST 98.1(2013):85-97.