Iron Isotope Fractionation during Skarn Cu-Fe Mineralization
文献类型：期刊论文
| 作者 | Xue, Song1; Niu, Yaoling1,2,3; Chen, Yanhong1; Shi, Yining1; Xia, Boyang1; Wang, Peiyao3,4,5 ; Gong, Hongmei3,4,5; Wang, Xiaohong3,4,5; Duan, Meng3,4,5
|
| 刊名 | MINERALS
 |
| 出版日期 | 2021-05-01 |
| 卷号 | 11期号:5页码:18 |
| 关键词 | porphyry-skarn deposits Fe isotopes isotopic fractionation pathway effects light-Fe fluid redox state |
| DOI | 10.3390/min11050444 |
| 通讯作者 | Xue, Song(song.x@cugb.edu.cn) ; Niu, Yaoling(yaoling.niu@durham.ac.uk) |
| 英文摘要 | Fe isotopes have been applied to the petrogenesis of ore deposits. However, the behavior of iron isotopes in the mineralization of porphyry-skarn deposits is still poorly understood. In this study, we report the Fe isotopes of ore mineral separations (magnetite, pyrite, chalcopyrite and pyrrhotite) from two different skarn deposits, i.e., the Tonglvshan Cu-Fe skarn deposit developed in an oxidized hydrothermal system and the Anqing Cu skarn deposit developed in a reduced hydrothermal system. In both deposits, the Fe isotopes of calculated equilibrium fluids are lighter than those of the intrusions responsible for the skarn and porphyry mineralization, corroborating the "light-Fe fluid" hypothesis. Interestingly, chalcopyrite in the oxidized-Tonglvshan skarn deposit has lighter Fe than chalcopyrite in the reduced-Anqing skarn deposit, which is best understood as the result of the prior precipitation of magnetite (heavy Fe) from the ore fluid in the oxidized-Tonglvshan systems and the prior precipitation of pyrrhotite (light Fe) from the ore fluid in the reduced-Anqing system. The delta Fe-56 for pyrite shows an inverse correlation with delta Fe-56 of magnetite in the Tonglvshan. In both deposits, the Fe isotope fractionation between chalcopyrite and pyrite is offset from the equilibrium line at 350 degrees C and lies between the FeS-chalcopyrite equilibrium line and pyrite-chalcopyrite equilibrium line at 350 degrees C. These observations are consistent with the FeS pathway towards pyrite formation. That is, Fe isotopes fractionation during pyrite formation depends on a path from the initial FeS-fluid equilibrium towards the pyrite-fluid equilibrium due to the increasing extent of Fe isotopic exchange with fluids. This finding, together with the data from other deposits, allows us to propose that the pathway effect of pyrite formation in the Porphyry-skarn deposit mineralization is the dominant mechanism that controls Fe isotope characteristics. |
| 资助项目 | National Natural Science Foundation (NSFC)[41630968] ; National Natural Science Foundation (NSFC)[91958215] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1606401] ; 111 project[B18048] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:000662438300001 |
| 出版者 | MDPI |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/176921]  |
| 专题 | 中国科学院海洋研究所 |
| 通讯作者 | Xue, Song; Niu, Yaoling |
| 作者单位 | 1.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 2.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 3.Lab Marine Geol, Qingdao Natl Lab Marine Sci & Technol, Qingdao 266061, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 5.Chinese Acad Sci, Ctr Ocean Megasci, 7 Nanhai Rd, Qingdao 266071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xue, Song,Niu, Yaoling,Chen, Yanhong,et al. Iron Isotope Fractionation during Skarn Cu-Fe Mineralization[J]. MINERALS,2021,11(5):18. |
| APA | Xue, Song.,Niu, Yaoling.,Chen, Yanhong.,Shi, Yining.,Xia, Boyang.,...&Duan, Meng.(2021).Iron Isotope Fractionation during Skarn Cu-Fe Mineralization.MINERALS,11(5),18. |
| MLA | Xue, Song,et al."Iron Isotope Fractionation during Skarn Cu-Fe Mineralization".MINERALS 11.5(2021):18. |
入库方式： OAI收割
来源：海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。