Constraints of Fe isotopes on the origin of volcanic-hosted Fe-oxide deposits: A case study of the Late Cambrian 7918 Fe deposit, North Altun orogenic belt, Xinjiang, NW China
文献类型：期刊论文
| 作者 | Meng, Lingtong1,2,3; Chen, Bailin2; Wu, Yu4; Wang, Yong2 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2021-06-01 |
| 卷号 | 212页码:19 |
| 关键词 | Volcanic-hosted Fe-oxide deposit Skarn-type alteration Fe isotopes Source of Fe Ore-forming process |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2021.104723 |
| 英文摘要 | The 7918 Fe deposit in the North Altun orogenic belt, NW China, is composed of strata-bound orebodies between Late Cambrian basalts and marble, associated with intensive skarn-type alteration. Basalts close to the orebodies are altered, with gradational contacts to skarns. Variations of major and trace elements and delta Fe-57 values of low-Ti and high-Ti basalts reflect the role of both magmatic evolution and hydrothermal alteration. Negative correlations between delta Fe-57 and TFeO/TiO2 and between Na2O and TFeO/TiO2 of high-Ti basalts are explained by lighter Fe isotopes leached from basalts during water-rock reaction. Hence, we considered basalts as the main source of Fe. Magnetite precipitation was related to a retrograde skarn stage. Early-precipitated magnetite has lower incompatible trace elements (Lu, Zr, Hf, Nb, Ta, and Yb), higher compatible trace elements (Co and Ni), and lower delta Fe-57 values than late-precipitated magnetite. Hydrothermal fluids equilibrated with early-precipitated magnetite (-0.11 parts per thousand to 0.16 parts per thousand) and late-precipitated magnetite (0.22 parts per thousand to 0.27 parts per thousand) have delta Fe-57 values of -0.38 parts per thousand to -0.11 parts per thousand and -0.05 parts per thousand to 0.00 parts per thousand, respectively. The isotopically heavier late-phase fluids indicate an increase of oxygen fugacity, in which Fe2+ was mostly oxidized to Fe3+. This is also consistent with reduced V concentrations from early-precipitated to late-precipitated magnetite. Our new data and previous geochronological results suggested that the 7918 Fe deposit records a continuous process of volcanic eruption, hydrothermal alteration, and Fe mineralization, which was related to a deep "magma chamber" formed at a subduction-related setting. |
| WOS关键词 | ZIRCON U-PB ; IRON DEPOSIT ; SKARN DEPOSIT ; ALTYN-TAGH ; TRACE-ELEMENT ; MASS-SPECTROMETRY ; FLUID INCLUSIONS ; WESTERN TIANSHAN ; EASTERN TIANSHAN ; TIBETAN PLATEAU |
| 资助项目 | Chinese Ministry of Science and Technology[2017YFC0602602] ; Chinese Ministry of Science and Technology[2016YFC0600207] ; National Natural Science Foundation of China[91855212] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000647610600001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/101211]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Chen, Bailin |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 2.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.CNNC, Beijing Res Inst Uranium Geol, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Meng, Lingtong,Chen, Bailin,Wu, Yu,et al. Constraints of Fe isotopes on the origin of volcanic-hosted Fe-oxide deposits: A case study of the Late Cambrian 7918 Fe deposit, North Altun orogenic belt, Xinjiang, NW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2021,212:19. |
| APA | Meng, Lingtong,Chen, Bailin,Wu, Yu,&Wang, Yong.(2021).Constraints of Fe isotopes on the origin of volcanic-hosted Fe-oxide deposits: A case study of the Late Cambrian 7918 Fe deposit, North Altun orogenic belt, Xinjiang, NW China.JOURNAL OF ASIAN EARTH SCIENCES,212,19. |
| MLA | Meng, Lingtong,et al."Constraints of Fe isotopes on the origin of volcanic-hosted Fe-oxide deposits: A case study of the Late Cambrian 7918 Fe deposit, North Altun orogenic belt, Xinjiang, NW China".JOURNAL OF ASIAN EARTH SCIENCES 212(2021):19. |
入库方式： OAI收割
来源：地质与地球物理研究所
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