Fluid sources and precipitation mechanisms of Pb-Zn-(Cu) sulphide-sulphate in the Iheya North Knoll hydrothermal field, Okinawa Trough: insights from fluid inclusions, He and Ar isotopes
文献类型：期刊论文
| 作者 | Yang, Zhifeng2; Zhai, Shikui2; Yu, Zenghui2; Zhang, Xia2; Xu, Jie2; Su, Fei1 |
| 刊名 | INTERNATIONAL GEOLOGY REVIEW
 |
| 出版日期 | 2020-12-01 |
| 页码 | 16 |
| ISSN号 | 0020-6814 |
| 关键词 | Fluid inclusion helium isotopes Iheya North Knoll Okinawa Trough |
| DOI | 10.1080/00206814.2020.1793421 |
| 英文摘要 | The Okinawa Trough is an extensive back-arc basin that was formed by the subduction of the Philippine Sea plate beneath the Eurasian continent. Instances of Zn-Pb-(Cu) mineralization, which are typically associated with volcanism, are commonly found in many of the hydrothermal fields throughout this trough. We analysed the fluid inclusions and helium isotopic compositions of samples collected from the sulphide-sulphate chimneys/mounds in the Iheya North Knoll hydrothermal field in the Middle Okinawa Trough. For fluid inclusions in sphalerite and anglesite, we found that the homogenization temperatures ranged from 288 degrees C to 345 degrees C and 242 degrees C to 370 degrees C, while the salinity values ranged from 5.45 to 10.55 wt.% NaCl equiv. and 6.45 to 8.55 wt.% NaCl equiv., respectively. Microthermometry results from these inclusions yielded temperatures of 330 degrees C-350 degrees C; at these temperatures, seawater may have been boiling during the ore formation process. These data, in addition to measurement of high hydrothermal fluid He-3/He-4 ratios (6.5 to 7.8 Ra), suggest that the fluid is mainly derived from the back-arc basin basalts (BABBs), and have been mixed with a small amount of seawater. Moreover, the He-3 enrichment found in this hydrothermal system indicates that these fluids may be sourced from deeper basaltic magma, rather than strongly degassed rhyolitic magma. Based on these anglesite-hosted fluid inclusions and the results of IODP Expedition 331 in this hydrothermal field, we infer that multiple hydrothermal fluid reservoirs exist beneath the seafloor in this region; the accumulation and migration of various solutions in these reservoirs promote mineralization, and extensive alteration of the host rocks. Mantle-derived He enters the hydrothermal fluid system by basaltic magma degassing. After experiencing fluid mixing, phase separation, and cooling, Pb-Zn-(Cu) minerals ultimately precipitate out of this hydrothermal fluid. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | TAYLOR & FRANCIS INC |
| WOS记录号 | WOS:000596154500001 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/99856]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhai, Shikui |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 2.Ocean Univ China, Coll Marine Geosci, Qingdao, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Zhifeng,Zhai, Shikui,Yu, Zenghui,et al. Fluid sources and precipitation mechanisms of Pb-Zn-(Cu) sulphide-sulphate in the Iheya North Knoll hydrothermal field, Okinawa Trough: insights from fluid inclusions, He and Ar isotopes[J]. INTERNATIONAL GEOLOGY REVIEW,2020:16. |
| APA | Yang, Zhifeng,Zhai, Shikui,Yu, Zenghui,Zhang, Xia,Xu, Jie,&Su, Fei.(2020).Fluid sources and precipitation mechanisms of Pb-Zn-(Cu) sulphide-sulphate in the Iheya North Knoll hydrothermal field, Okinawa Trough: insights from fluid inclusions, He and Ar isotopes.INTERNATIONAL GEOLOGY REVIEW,16. |
| MLA | Yang, Zhifeng,et al."Fluid sources and precipitation mechanisms of Pb-Zn-(Cu) sulphide-sulphate in the Iheya North Knoll hydrothermal field, Okinawa Trough: insights from fluid inclusions, He and Ar isotopes".INTERNATIONAL GEOLOGY REVIEW (2020):16. |
入库方式： OAI收割
来源：地质与地球物理研究所
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