The characteristics of iron-bearing minerals and the depositional facies of BIF in Dagushan iron deposit, Anshan area: Indications of formation environment

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	The characteristics of iron-bearing minerals and the depositional facies of BIF in Dagushan iron deposit, Anshan area: Indications of formation environment
	Tong XiaoXue 1,2,3; Zhang LianChang 1,2,3; Wang ChangLe 1,2; Peng ZiDong 1,2,3; Nan JingBo 3,4
刊名	ACTA PETROLOGICA SINICA
	2018
卷号	34 期号:4 页码:1119-1138
关键词	Banded iron formation Mineral genesis Primary mineral Depositional facies and environment Anshan-Benxi area
ISSN号	1000-0569
文献子类	Article
英文摘要	Anshan-Benxi area is located in the northeast margin of North China Craton, which is the most important resource base of the banded iron formation (BIF) type iron ores in China. As a typical Algoma-type BIF, Dagushan BIF locates in the south ore belt in Anshan area, and comparing with characteristics of other BIFs in China, the Dagushan BIF is obviously distinct mainly in mild metamorphism (greenschist- to lower amphibolite-facies) and integrated depositional facies. Thus, the Dagushan BIF can be used as a good probe to pursue the precursor materials, to invert the primary minerals and their evolutions as well as to discuss the environment of ancient oceans. Hosted in the metasedimentary sequence of Yingtaoyuan Formation in Anshan Group, the Dagushan BIF strikes integrally north-west and dips steeply north-west at 30 degrees to 60 degrees. Oxide (30%), silicate (50%) and carbonate (20%) facies iron formations are recognized based on predominant iron minerals within the iron-rich layers. The oxide facies is composed of magnetite and quartz; the silicate facies consists mainly of stilpnomelane, chlorite and cummingtonite other than quartz and magnetite; while the most prominent carbonate minerals in the carbonate facies is siderite. Integration of petrographic evidence and mineral chemistry indicates that the most likely precursor materials were probably amorphous silica gels, Al-rich detrital clay, which has converted to the minerals today due to subsequent processes, such as diagenesis and metamorphism. The P-O2-P-CO2 and pH-Eh fields of these minerals (and/or their precursors) indicate anoxic and near-neutral to slightly alkaline conditions for the original depositional environment, from which we can infer that the significant factors affecting the formation of minerals are probably redox statement of ancient ocean, pH value, the content of CO2 and sulphur fugacity.
WOS关键词	NORTH CHINA CRATON ; RARE-EARTH-ELEMENTS ; ZIRCON U-PB ; SOUTH-AFRICA ; TRANSVAAL SUPERGROUP ; CRUSTAL GROWTH ; ISOTOPIC COMPOSITIONS ; LIAONING PROVINCE ; SUPRACRUSTAL BELT ; PRIMARY HEMATITE
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000431895400014
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88286]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Zhang LianChang
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
推荐引用方式 GB/T 7714	Tong XiaoXue,Zhang LianChang,Wang ChangLe,et al. The characteristics of iron-bearing minerals and the depositional facies of BIF in Dagushan iron deposit, Anshan area: Indications of formation environment[J]. ACTA PETROLOGICA SINICA,2018,34(4):1119-1138.
APA	Tong XiaoXue,Zhang LianChang,Wang ChangLe,Peng ZiDong,&Nan JingBo.(2018).The characteristics of iron-bearing minerals and the depositional facies of BIF in Dagushan iron deposit, Anshan area: Indications of formation environment.ACTA PETROLOGICA SINICA,34(4),1119-1138.
MLA	Tong XiaoXue,et al."The characteristics of iron-bearing minerals and the depositional facies of BIF in Dagushan iron deposit, Anshan area: Indications of formation environment".ACTA PETROLOGICA SINICA 34.4(2018):1119-1138.