Porphyry copper mineralization triggered by sulfate reduction and alkali metasomatism: Constraints from an experimental investigation
文献类型：期刊论文
| 作者 | Li, Jianping1; Liu, Weihua2; Su, Long3; Li, Dengfeng4; Zhang, Shitao5; Chen, Huayong1,6,7
|
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2023-09-01 |
| 卷号 | 135期号:9-10页码:2407-2427 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B36435.1 |
| 英文摘要 | The potassium silicate (K-silicate) alteration zone is the main ore contributor in porphyry copper deposits worldwide. Knowledge of element behaviors in the alteration and mineralization processes is essential for an improved understanding of porphyry copper mineralization, but they are still not well understood. In this study, we reacted synthetic Cl-rich fluids, containing K, Na, Cu, Mo, Zn, etc., with andesite in a complex experimental system to simulate the shallow porphyry copper mineralization process. We aimed to bridge the gap between simple experimental studies and complex natural systems and to evaluate the contribution of sulfate reduction to porphyry ore formation and its relationship with early alkali metasomatism. The results show that increasing temperature (from 300 to 500 degrees C) enhances the K-silicate alteration by promoting ion-exchange reactions, and the K-feldspar is mainly formed by the transformation of plagioclase via a dissolution-reprecipitation processes. The low-salinity vapor phase has a stronger capacity for K-silicate alteration than the liquid phase at similar temperatures. In addition, increasing temperature from 300 to 500 degrees C favors sulfate reduction to further enhance metal sulfide precipitation. The limited availability of reduced sulfur in the fluid causes preferential precipitation of Cu-(Mo) sulfides, while most of the Zn is soluble in the fluid, and Cu precipitation as sulfides in the vapor is much more efficient than in the coexisting liquid. The overlap between the K-silicate alteration zone and the mineralization triggered by sulfate reduction in porphyry copper deposits is controlled by several concomitant factors, e.g., relatively high temperature (e.g., at 400-500 degrees C), vapor formation, and decompression. Moreover, K-silicate alteration would further promote mineralization by changing fluid compositions, e.g., removing K from the fluid. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001101571800013 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/79163]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Chen, Huayong |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China 2.Mineral Resources, Commonwlth Sci & Ind Res Org CSIRO Clayton, Victoria 3168, Australia 3.Chinese Acad Sci, Northwest Inst Eco Environm & Resources, Lanzhou 730000, Peoples R China 4.Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510006, Peoples R China 5.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 6.Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 7.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Jianping,Liu, Weihua,Su, Long,et al. Porphyry copper mineralization triggered by sulfate reduction and alkali metasomatism: Constraints from an experimental investigation[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2023,135(9-10):2407-2427. |
| APA | Li, Jianping,Liu, Weihua,Su, Long,Li, Dengfeng,Zhang, Shitao,&Chen, Huayong.(2023).Porphyry copper mineralization triggered by sulfate reduction and alkali metasomatism: Constraints from an experimental investigation.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,135(9-10),2407-2427. |
| MLA | Li, Jianping,et al."Porphyry copper mineralization triggered by sulfate reduction and alkali metasomatism: Constraints from an experimental investigation".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 135.9-10(2023):2407-2427. |
入库方式： OAI收割
来源：广州地球化学研究所
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。