Origin and evolution of silicic magmas in the Okinawa trough: insights from coupled cathodoluminescence, trace element, and oxygen isotope analyses of quartz
文献类型：期刊论文
| 作者 | Luo, Xinyu2,3; Zeng, Zhigang1,4,5; Chen, Zuxing1,2,5; Zhang, Yuxiang1,2,5 |
| 刊名 | CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
 |
| 出版日期 | 2025-07-28 |
| 卷号 | 180期号:9页码:25 |
| 关键词 | Quartz Thermobarometer Oxygen isotopes Crustal contamination Okinawa trough |
| ISSN号 | 0010-7999 |
| DOI | 10.1007/s00410-025-02236-2 |
| 通讯作者 | Zeng, Zhigang(zgzeng@qdio.ac.cn) |
| 英文摘要 | The Okinawa Trough, a continental-margin back-arc basin in the northwestern Pacific Ocean, is characterized by numerous hydrothermal fields and spatially consistent submarine volcanoes, indicating the presence of active, shallow magma chambers. The potential for volcanic eruptions, coupled with its proximity to populated areas, underscores the need for comprehensive studies of the underlying magmatic processes. In this study, we perform a detailed investigation of cathodoluminescence imaging, trace elements (Ti), and oxygen isotopes in quartz from two rhyolite samples collected from the middle and southwestern Okinawa Trough (MOT and SWOT). We observe varying proportions and CL patterns of rapid growth features in quartz from SWOT (40%) and MOT (4%), which imply different magmatic processes. Step zoning, involving Ti-poor and Ti-rich overgrowths, is prevalent in both regions and may reflect temperature variations rather than changes in TiO2 activity or pressure. Oscillatory and step zoning represent the products of near-equilibrium crystallization, and their Ti contents can, therefore, be used to reconstruct the P-T conditions of the magma. Based on the estimated crystallization temperatures of 750 degrees C and 770 degrees C for SWOT and MOT quartz, respectively, the depths of the shallow silicic reservoirs for SWOT and MOT are inferred to be similar to 9 km. Jagged, bright cores (with high Ti content and variable delta O-18 values) in MOT quartz are interpreted as xenocrysts, providing mineralogical evidence for the assimilation of country rocks. The delta O-18 values, corrected for fractional crystallization and representing primary magmatic signatures, suggest that the SWOT magma has undergone greater contamination by upper crustal material (15-25%) than the MOT magma (< 18%). Moreover, our study reveals a slight negative correlation between delta O-18 values and grayscale values (or Ti content). This relationship can be readily explained by a near-wall crystallization mechanism, which also accounts for the common occurrence of Ti-poor overgrowths. Additionally, we attempted to constrain the crystal residence time using the diffusion of Ti in quartz, but the uncertainties of available calibrations largely hampered the interpretation. Nonetheless, if long-term near-wall crystallization is accepted, the mush model would imply that the magma chamber is primarily melt-dominated. Collectively, the distinctive textures and chemistry support the robustness of quartz as a reliable tracer for magmatic processes in shallow silicic reservoirs beneath the seafloor. |
| WOS关键词 | VOLCANIC-ROCKS ; TI DIFFUSION ; BIMODAL MAGMATISM ; SUBMARINE VOLCANO ; RYUKYU ARC ; HEAT-FLOW ; RHYOLITES ; RECHARGE ; TITANIQ ; MELTS |
| 资助项目 | National Natural Science Foundation of China[42330409] ; National Natural Science Foundation of China[42221005] ; National Natural Science Foundation of China[91958213] ; National Basic Research Program of China[2013CB429700] ; Taishan Scholars Program[ts201511061] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001539172300001 |
| 出版者 | SPRINGER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/202704]  |
| 专题 | 海洋研究所_海洋环流与波动重点实验室 |
| 通讯作者 | Zeng, Zhigang |
| 作者单位 | 1.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Shandong, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Tianjin Univ, Sch Marine Sci & Technol, Seafloor Hydrothermal Act Lab, Tianjin 300072, Peoples R China 5.Laoshan Lab, Lab Marine Mineral Resources, Qingdao 266061, Shandong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Luo, Xinyu,Zeng, Zhigang,Chen, Zuxing,et al. Origin and evolution of silicic magmas in the Okinawa trough: insights from coupled cathodoluminescence, trace element, and oxygen isotope analyses of quartz[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2025,180(9):25. |
| APA | Luo, Xinyu,Zeng, Zhigang,Chen, Zuxing,&Zhang, Yuxiang.(2025).Origin and evolution of silicic magmas in the Okinawa trough: insights from coupled cathodoluminescence, trace element, and oxygen isotope analyses of quartz.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,180(9),25. |
| MLA | Luo, Xinyu,et al."Origin and evolution of silicic magmas in the Okinawa trough: insights from coupled cathodoluminescence, trace element, and oxygen isotope analyses of quartz".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 180.9(2025):25. |
入库方式： OAI收割
来源：海洋研究所
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