Chentaigou BIF-type iron deposit, Anshan area associated with Archean crustal growth: Constraints from zircon U-Pb dating and Hf isotope
文献类型：期刊论文
| 作者 | Dai YanPei1,2; Zhang LianChang1; Zhu MingTian1; Wang ChangLe1,2; Liu Li1,2 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2013-07-01 |
| 卷号 | 29期号:7页码:2537-2550 |
| 关键词 | Banded Iron Formation Chlorite-quartz Schist Archean Crustal Growth Chentaigou Iron Deposit Anshan Area |
| 文献子类 | Article |
| 英文摘要 | Located in the Anshan area, Liaoning Province, the newly discovered Chentaigou concealed iron deposit mainly consists of banded iron ores, with the roof rock of chlorite-quartz schist and the bottom rock of biotite-quartz schist. Geochemical data show the iron ore and magnetite are enriched in HREE characterized by positive La, Eu and Y anomaly without apparent negative Ce anomaly, indicating that the ore-forming materials were derived from mixtures of high-T hydrothermal fluids (similar to 0. 1%) and seawater, and implying that the seawater was under anoxic condition during the deposition. Typomorphic studies indicate that the iron ore and magnetite are metamorphosed sedimentary-type or BIF-type. The protolith of chlorite-quartz schist was acid volcanic rock while that of biotite-quartz schist was pelitic or arenaceous rocks, which are all enriched in Rb, Th, U and LREE, and depleted in Nb, Ta and Ti. The protolith of these schists was formed under island arc setting, suggesting that the Chentaigou BIF was deposited in island arc setting. LA-ICP-MS zircon U-Pb dating shows the magmatic zircons were crystallized at 2551 +/- 10Ma, representing the formation age of the Chentaigou BIF, while the metamorphic zircons were formed at 2469 +/- 23Ma, reflecting the age of later metamorphic event. Hf isotopic data indicate that most of the zircons have positive epsilon(Hf)(t) values between -2. 23 and 7. 54, implying that the magma provenance was mainly made up of materials from depleted mantle with contamination of recycled old crust. Two-stage model ages (t(DM2)) are primarily between 3133Ma and 2580Ma. Combined with Hf isotopic data of other deposits, it is suggested that Neoarchean (similar to 2. 55Ga) crustal growth occurred in the Anshan-Benxi area. To sum up, we propose that the Chentaigou iron deposit belongs to the Algoma-type BIF, which represents a large-scale Neoarehean BIF metallogenic event widely distributed in the North China craton. |
| WOS关键词 | NORTH CHINA CRATON ; TRACE-ELEMENT CHARACTERISTICS ; RARE-EARTH-ELEMENTS ; LIAONING PROVINCE ; FORMATION AGE ; GREENSTONE-BELT ; SOUTH-AFRICA ; GEOCHEMISTRY ; PETROGENESIS ; DISCRIMINATION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000322926000019 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62660]  |
| 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 |
| 推荐引用方式 GB/T 7714 | Dai YanPei,Zhang LianChang,Zhu MingTian,et al. Chentaigou BIF-type iron deposit, Anshan area associated with Archean crustal growth: Constraints from zircon U-Pb dating and Hf isotope[J]. ACTA PETROLOGICA SINICA,2013,29(7):2537-2550. |
| APA | Dai YanPei,Zhang LianChang,Zhu MingTian,Wang ChangLe,&Liu Li.(2013).Chentaigou BIF-type iron deposit, Anshan area associated with Archean crustal growth: Constraints from zircon U-Pb dating and Hf isotope.ACTA PETROLOGICA SINICA,29(7),2537-2550. |
| MLA | Dai YanPei,et al."Chentaigou BIF-type iron deposit, Anshan area associated with Archean crustal growth: Constraints from zircon U-Pb dating and Hf isotope".ACTA PETROLOGICA SINICA 29.7(2013):2537-2550. |
入库方式： OAI收割
来源：地质与地球物理研究所
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