Analysis of sedimentary facies and depositional environment of the Yuanjiacun banded iron formation in the Luliang area, Shanxi Province
文献类型：期刊论文
| 作者 | Wang ChangLe1,2; Zhang LianChang1; Lan CaiYun2,3; Li HongZhong1; Huang Hua1 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2015-06-01 |
| 卷号 | 31期号:6页码:1671-1693 |
| 关键词 | Banded iron formation Sedimentary facies Primary mineral assemblage Depositional environment Yuanjiacun Luliang area |
| 文献子类 | Article |
| 英文摘要 | The Yuanjiacun banded iron formation (BIF), located in the Luliang area, is likely to be the most representative Superior-type BIF in the North China Craton (NCC). Comparing with characteristics of other BIFs in China, the Yuanjiacun BIF is obviously distinct from them mainly involving three aspects: the formation age (2. 3 similar to 2. 1Ga), the genetic type (Superior) and mild metamorphism (lower greenschist facies). Thus, the Yuanjiacun BIF can be used as a good probe to understand atmospheric evolution and the chemical composition and redox states of the ancient oceans after the Great Oxidation Event (GOE) and is of great significance for relevant research on the Superior BIFs in China. The Yuanjiacun BIF is coherent with the sedimentary rock succession of the Yuanjiacun Formation in the Lower Ltiliang Group, and was interpreted to be deposited at 2. 3 2. 1Ga, based on ages of overlying and underlying volcanic strata. The BIF is distributed in a NNE-NEE direction with a steep occurrence. Oxide (magnetite and hematite), carbonate, and silicate facies iron formations are recognized based on predominant iron minerals within the iron-rich layers. The widespread oxide facies is composed of magnetite, hematite and quartz; the silicate facies is characterized by presence of iron silicate minerals and their metamorphic equivalens, consisting mainly of stilpnomelane, chlorite, minnesotaite, cummingtonite and actinolite other than quartz and magnetite; whereas the carbonate facies is rare in which the most prominent carbonate minerals are siderite and ankerite. Ankerite is commonly found in the silicate-carbonate facies iron formation. The distribution of primary sedimentary facies has been recovered on the basis of structural framework for iron-bearing rock sequences. Sedimentary facies extend along the N-S direction. The eastward transition from carbonate facies into oxide facies iron formation is accompanied by a change in mineralogical composition from siderite-facies iron formation in the west through magnetite-ankerite- and magnetite-stilpnomelane-facies iron formation in the transition zone to hematite-magnetite iron formation in the east. Integration of petrographic evidence and mineral chemistry indicates that the most likely precursor materials were comprised of probably hydrous, Fe-silicate gels of greenalite- and stilpnomelane-type compositions, amorphous silica gels, ferrihydrite, very fine-grained carbonate oozes of variable composition, and Al-rich detrital clay, which have been modified due to subsequent processes, such as diagenesis and metamorphism. The P-O2-P-CO2 and pH-Eh fields of the above minerals (and/or their precursors) indicate anoxic and near-neutral to slightly alkaline conditions for the original depositional environment except for the hematite precursor field (that of Fe (OH)(3)), which is very small and exists only at relatively high P-O2 values. Primary depositional features, such as tabular cross-bedding, interclastic and granular texture, are locally found in the oxide-facies iron formation. All these suggest a shallow-water, relatively high energy sedimentary environment for minor parts of iron formation. Nevertheless, the prevalence of alternating magnetite- and silica-rich bands in the Yuanjiacun BIF reflect that most of these occurrences were likely to be deposited in basin deeper than at least 200m, which is the minimum depth for modern storm wave base. |
| WOS关键词 | NORTH CHINA CRATON ; DALES GORGE MEMBER ; U-PB ; GOLD DEPOSITS ; TECTONIC IMPLICATIONS ; WESTERN-AUSTRALIA ; HAMERSLEY GROUP ; JIEHEKOU GROUP ; FORMATION AGE ; GEOCHEMISTRY |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000357547700013 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62340]  |
| 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 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang ChangLe,Zhang LianChang,Lan CaiYun,et al. Analysis of sedimentary facies and depositional environment of the Yuanjiacun banded iron formation in the Luliang area, Shanxi Province[J]. ACTA PETROLOGICA SINICA,2015,31(6):1671-1693. |
| APA | Wang ChangLe,Zhang LianChang,Lan CaiYun,Li HongZhong,&Huang Hua.(2015).Analysis of sedimentary facies and depositional environment of the Yuanjiacun banded iron formation in the Luliang area, Shanxi Province.ACTA PETROLOGICA SINICA,31(6),1671-1693. |
| MLA | Wang ChangLe,et al."Analysis of sedimentary facies and depositional environment of the Yuanjiacun banded iron formation in the Luliang area, Shanxi Province".ACTA PETROLOGICA SINICA 31.6(2015):1671-1693. |
入库方式： OAI收割
来源：地质与地球物理研究所
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