Genetic type, formation age and tectonic setting of the Waitoushan banded iron formation, Benxi, Liaoning Province
文献类型：期刊论文
| 作者 | Dai YanPei1,2; Zhang LianChang1; Wang ChangLe1,2; Liu Li1,2; Cui MinLi1; Zhu MingTian1; Xiang Peng1,2 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2012-11-01 |
| 卷号 | 28期号:11页码:3574-3594 |
| 关键词 | Banded iron formation Amphibolite Neoarehean Back-arc basin basalt Waitoushan iron deposit Anshan-Benxi area |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Anshan-Benxi area in Liaoning Province, where plenty of large-superlarge banded iron formations are distributed, is located at the northeastern part of the North China craton. Petrology, mineralogy and geochronology of the Waitoushan iron deposit in Anshan-Benxi area are studied in this paper. Iron ores in the Waitoushan deposit are predominantly banded, with a scrap of massive. The Archean amphibolites in the Anshan Group were developed as main wall rocks and interlayer among the orebodies. Geochemical analyses show the iron ores are enriched in HREE [(La/Yb)(PAAS) = 0.24 similar to 0.33], and characterized by positive La anomaly (La/La* = 1.43 similar to 1.61), positive Eu anomaly (Eu/Eu* = 2.40 similar to 4.54) and positive Y anomaly (Y/Y* = 1.10 similar to 1.30) with Y/Ho = 30.59, Sr/Ba = 17.62, Ti/V = 19.45, indicating the ore-forming materials were derived from the intermixture of high temperature hydrotherm and seawater. There is no distinct negative Ce anomaly (Ce/Ce* = 0.92 similar to 1.06), Untying the seawater was under anoxic condition during the deposition of the Waitoushan BIF. Apart from Fe2O3T and SiO2, the contents of other oxides are rather low, with depletion in continental origin elements (such as Tu, U, Zr), implying the continental detrital materials contributed little to the metallogenic process of the Waitoushan BIF. The chondrite-normalized REE pattern of amphibolites is flat [(La/Yb), = 0.80 similar to 1.10] with no distinct Ce anomalies (Ce/Ce* = 0.95 similar to 0.99) and Eu anomalies (Eu/Eu* = 0.88 similar to 1.16), while the N-MORB-normalized trace element pattern shows enrichment in LILE without pronounced depletion in HFSE. Geochemical analyses show the protolith of amphibolites was probably basic volcanics originating in back-arc basin setting. Morphology and trace element analyses of zircon grains indicate the zircons selected from amphibolites were all magmatic. SIMS zircon U-Pb dating shows the protolith of amphibolites was formed at 2533 +/- 11 Ma, standing for the formation age of the Waitoushan iron deposit. During the eruption of basaltic magma, a group of zircons with the age of 2610 +/- 5Ma were captured. Electron microprobe analysis shows the composition of magnetites is pure and single (FeOT = 92.04% similar to 93.05%), and the typomorphic studies indicate the Waitoushan deposit is attached to metamorphosed sedimentary iron deposit. To sum up, we propose the Waitoushan deposit belongs to the Algoma-type BIF, showing an affinity with the magmation in back-arc basin setting and representing a Neoarehean metallogenic event of BIF widely developed in the North China craton. |
| WOS关键词 | RARE-EARTH-ELEMENTS ; BACK-ARC BASIN ; NORTH CHINA CRATON ; ZIRCON U-PB ; TRACE-ELEMENT ; CRUSTAL EVOLUTION ; ANSHAN AREA ; TRANSVAAL SUPERGROUP ; CHEMICAL-COMPOSITION ; HYDROTHERMAL FLUIDS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000312572600011 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/84316]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Dai YanPei |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dai YanPei,Zhang LianChang,Wang ChangLe,et al. Genetic type, formation age and tectonic setting of the Waitoushan banded iron formation, Benxi, Liaoning Province[J]. ACTA PETROLOGICA SINICA,2012,28(11):3574-3594. |
| APA | Dai YanPei.,Zhang LianChang.,Wang ChangLe.,Liu Li.,Cui MinLi.,...&Xiang Peng.(2012).Genetic type, formation age and tectonic setting of the Waitoushan banded iron formation, Benxi, Liaoning Province.ACTA PETROLOGICA SINICA,28(11),3574-3594. |
| MLA | Dai YanPei,et al."Genetic type, formation age and tectonic setting of the Waitoushan banded iron formation, Benxi, Liaoning Province".ACTA PETROLOGICA SINICA 28.11(2012):3574-3594. |
入库方式： OAI收割
来源：地质与地球物理研究所
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