Decoupling of cobalt and nickel in high-temperature magmatic processes and its metallogenic indication
文献类型：期刊论文
| 作者 | Su BenXun2,3; Cui MengMeng2; Yuan QingHan2,3; Wang Jing2 ; Bai Yang1
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| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2023-10-01 |
| 卷号 | 39期号:10页码:2867-2878 |
| ISSN号 | 1000-0569 |
| 关键词 | Co-Ni deposit Co-Ni decoupling Melt/fluid-rock interaction Mafic-ultramafic rock |
| DOI | 10.18654/1000-0569/2023.10.01 |
| 英文摘要 | Cobalt ( Co) and nickel (Ni) have similar geochemical behaviors and commonly co -vary in nature, but they may undergo decoupling in certain geological processes, especially in ore -forming processes, and the decoupling mechanism is not yet clear. This paper analyzes the distribution characteristics and migration behaviors of Co and Ni in major rock -forming minerals in different types of mafic-ultramafic rocks. The Ni (2500 x 10(-6) 3400 x 10(-6)) and Co (110 x 10(-6) 160 x 10(-6)) contents of mantle olivine are both higher than those of the primitive mantle. The Ni content shows no obvious correlation with the Fo value, while the Co content has a strong negative correlation with both the Fo value and the Ni/Co ratio. This indicates that partial melting does not cause significant changes in Ni content of olivine, but can control the Co content and the Ni/Co ratio, mainly due to the differences in compatibility between the two elements in olivine. Melt-rock reactions can cause significant Co-Ni decoupling between minerals and within minerals, but the mechanisms differ. In the process of reacting with basaltic magma, olivine mainly absorbs Co and loses Ni, while being affected by coexisting spinet minerals. When reacting with carbonatite melt, olivine loses Co, but Ni remains almost unchanged. As mantle derived basaltic magma intrudes into the lower crust, the migration of Co and Ni in pyroxenes is controlled by concentration gradients and sulfide crystallization. The local enrichment of Co provides an important material basis for the formation of Co -rich melts in deep crustal melting. During the differentiation and evolution of mafic-ultramafic magma, the chromite fractional crystallization and sulfide segregation can cause Co-Ni decoupling at both rock and/or mineral scales. Meanwhile, the enriched hydrous fluids released during chromite aggregation and sulfide melt solidification can significantly promote the efficiency of element exchange in sub-solidus state, especially strengthening the activity of Co, thus causing negative correlations between Co and Ni in olivine and even in chromite. Comparative studies show that the trends of Co and Ni content changes in mineral assemblages are evidently different, or even opposite, between mineralized and barren bodies and between ore -bearing and ore -free rocks, which provides a basis for identifying mineralization in rock bodies and guiding prospecting. |
| WOS关键词 | MELT-ROCK INTERACTION ; PODIFORM CHROMITITES ; LITHOSPHERIC MANTLE ; LUOBUSA OPHIOLITE ; ISOTOPIC EVIDENCE ; CONSTRAINTS ; DIFFUSION ; MAGNESIUM ; ELEMENTS ; SULFIDE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:001085199300001 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/110711]  |
| 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 |
| 通讯作者 | Su BenXun |
| 作者单位 | 1.Taiyuan Univ Technol, Coll Min Engn, Taiyuan 030024, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Su BenXun,Cui MengMeng,Yuan QingHan,et al. Decoupling of cobalt and nickel in high-temperature magmatic processes and its metallogenic indication[J]. ACTA PETROLOGICA SINICA,2023,39(10):2867-2878. |
| APA | Su BenXun,Cui MengMeng,Yuan QingHan,Wang Jing,&Bai Yang.(2023).Decoupling of cobalt and nickel in high-temperature magmatic processes and its metallogenic indication.ACTA PETROLOGICA SINICA,39(10),2867-2878. |
| MLA | Su BenXun,et al."Decoupling of cobalt and nickel in high-temperature magmatic processes and its metallogenic indication".ACTA PETROLOGICA SINICA 39.10(2023):2867-2878. |
入库方式： OAI收割
来源：地质与地球物理研究所
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