Fluid origin and critical ore-forming processes for the giant gold mineralization in the Jiaodong Peninsula, China: Constraints from in situ elemental and oxygen isotopic compositions of quartz and LA-ICP-MS analysis of fluid inclusions
文献类型：期刊论文
| 作者 | Wang, Hong1,2; Lan, Ting-Guang1,2; Fan, Hong-Rui3; Huang, Zhi-Long2; Hu, Huan-Long2; Chen, Ying-Hua1,2; Tang, Yan-Wen2; Li, Jiao3 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2022-10-05 |
| 卷号 | 608页码:22 |
| ISSN号 | 0009-2541 |
| 关键词 | Trace element Oxygen isotope Quartz Fluid inclusion LA-ICP-MS SIMS Gold deposit |
| DOI | 10.1016/j.chemgeo.2022.121027 |
| 英文摘要 | The Jiaodong Peninsula, China, is one of the largest gold provinces in the world. During a short time interval in the Early Cretaceous, over 5000 t of gold were accumulated there. The mechanisms controlling the focused Au deposition and the origins of massive amounts of auriferous fluids are still controversial. Quartz-sulfide lode mineralization (Linglong-type) and disseminated/stockwork mineralization (Jiaojia-type) are the two major mineralization styles in the Jiaodong Peninsula. Herein, we conducted in situ textural, elemental and oxygen isotopic analyses using scanning electron microscopy (SEM), laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and secondary ion mass spectrometry (SIMS) on quartz from different hydrothermal stages and depths for three representative Linglong-type (Linglong deposit) and Jiaojia-type (Xiadian and Jiangjiayao deposits) gold deposits in the northwestern Jiaodong Peninsula, with the aim to constrain the ore-forming processes. The LA-ICP-MS analysis of individual fluid inclusions was also conducted to unravel the origin of the auriferous fluids. The results show that from the pre-mineralization to the ore-forming stages in the Linglong-type mineralization, the homogenization temperatures and salinities of fluid inclusions and the delta O-18(quartz) values change slightly, but the Al concentrations of quartz decrease continuously. Combined with the coexistence of CO2- and H2O-rich fluid inclusion endmembers, these trends indicate the increase of pH induced by CO2 degassing (fluid-fluid unmixing), which led to focused Au deposition. The quartz grains from the Jiaojia-type mineralization typically show a homogeneous texture with well-correlated lithophile elements (e.g., K, Al and Rb), which are distinct from those of the Linglong-type that are characterized by oscillatory zoning with much higher Al concentrations and delta O-18(quartz) values. These phenomena indicate that enhanced fluid-rock interaction occurred in the Jiaojia-type mineralization. In addition, the delta O-18(quartz) values show an increase from deep to shallow depths. In combination with thermodynamic modelling, it suggests decreasing fluid-rock interaction with decreasing depth. The above results corroborate that multiple mechanisms led to the efficient Au deposition in the Jiaodong Peninsula. Fluid-fluid unmixing typically occurred in the Linglong-type mineralization, while fluid-rock interaction was dominant in the Jiaojia-type mineralization. The different mechanisms might render mining challenging due to the changeable locations of favorable Au unloading. The LA-ICP-MS results of fluid inclusions suggest that the ore-forming fluids are metamorphic fluids rather than magmatic-hydrothermal fluids. In combination with the isotopic compositions of ores showing considerable mantle affinities and large-scale mafic underplating occurring beneath the study region, we propose a new genetic model that accounts for the origin of the auriferous fluids. The new model invokes the devolatilization of previously emplaced H2O-and Au-rich amphibole cumulates through amphibolite- to granulite-facies metamorphism in the middle-lower crust. It suggests an alternative way to generate the 'orogenic-like' gold deposits. |
| WOS关键词 | MAGMATIC-HYDROTHERMAL FLUIDS ; LOWER CRUST BENEATH ; NORTH CHINA ; TRACE-ELEMENTS ; CHEMICAL EVOLUTION ; GEOLOGICAL FLUIDS ; MO DEPOSIT ; EAST CHINA ; U-PB ; INSIGHTS |
| 资助项目 | National Key Research and Development Programs of China[2018YFA0702603] ; National Natural Science Foundation of China[41873048] ; West Light Foundation of The Chinese Academy of Sciences |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000888135900003 |
| 资助机构 | National Key Research and Development Programs of China ; National Key Research and Development Programs of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; West Light Foundation of The Chinese Academy of Sciences ; West Light Foundation of The Chinese Academy of Sciences ; National Key Research and Development Programs of China ; National Key Research and Development Programs of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; West Light Foundation of The Chinese Academy of Sciences ; West Light Foundation of The Chinese Academy of Sciences ; National Key Research and Development Programs of China ; National Key Research and Development Programs of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; West Light Foundation of The Chinese Academy of Sciences ; West Light Foundation of The Chinese Academy of Sciences ; National Key Research and Development Programs of China ; National Key Research and Development Programs of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; West Light Foundation of The Chinese Academy of Sciences ; West Light Foundation of The Chinese Academy of Sciences |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/107649]  |
| 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 | Lan, Ting-Guang |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Hong,Lan, Ting-Guang,Fan, Hong-Rui,et al. Fluid origin and critical ore-forming processes for the giant gold mineralization in the Jiaodong Peninsula, China: Constraints from in situ elemental and oxygen isotopic compositions of quartz and LA-ICP-MS analysis of fluid inclusions[J]. CHEMICAL GEOLOGY,2022,608:22. |
| APA | Wang, Hong.,Lan, Ting-Guang.,Fan, Hong-Rui.,Huang, Zhi-Long.,Hu, Huan-Long.,...&Li, Jiao.(2022).Fluid origin and critical ore-forming processes for the giant gold mineralization in the Jiaodong Peninsula, China: Constraints from in situ elemental and oxygen isotopic compositions of quartz and LA-ICP-MS analysis of fluid inclusions.CHEMICAL GEOLOGY,608,22. |
| MLA | Wang, Hong,et al."Fluid origin and critical ore-forming processes for the giant gold mineralization in the Jiaodong Peninsula, China: Constraints from in situ elemental and oxygen isotopic compositions of quartz and LA-ICP-MS analysis of fluid inclusions".CHEMICAL GEOLOGY 608(2022):22. |
入库方式： OAI收割
来源：地质与地球物理研究所
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