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The characteristics of iron-bearing minerals and the depositional facies of BIF in Dagushan iron deposit, Anshan area: Indications of formation environment
Tong XiaoXue1,2,3; Zhang LianChang1,2,3; Wang ChangLe1,2; Peng ZiDong1,2,3; Nan JingBo3,4; Zhang LianChang(Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China)
2018
Source PublicationACTA PETROLOGICA SINICA
Volume34Issue:4Pages:1119-1138
Contribution Rank第1完成单位 ; 第2完成单位 ; 第3完成单位 ; 第4完成单位
AbstractAnshan-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.
SubtypeArticle
KeywordBanded Iron Formation Mineral Genesis Primary Mineral Depositional Facies And Environment Anshan-benxi Area
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
Language英语
WOS KeywordNORTH CHINA CRATON ; RARE-EARTH-ELEMENTS ; ZIRCON U-PB ; SOUTH-AFRICA ; TRANSVAAL SUPERGROUP ; CRUSTAL GROWTH ; ISOTOPIC COMPOSITIONS ; LIAONING PROVINCE ; SUPRACRUSTAL BELT ; PRIMARY HEMATITE
WOS SubjectGeology
WOS IDWOS:000431895400014
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/5955
Collection深海科学研究部_深海地质与地球化学研究室
Corresponding AuthorZhang LianChang; Zhang LianChang(Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China)
Affiliation1.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
Recommended Citation
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,&Zhang LianChang.(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.
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