| Magmatic sulfide saturation and dissolution in the basaltic andesitic magma from the Yaeyama Central Graben, southern Okinawa Trough | |
| Chen, Zuxing1,2,3; Zeng, Zhigang1,2,3,4; Tamehe, Landry Soh5; Wang, Xiaoyuan1,2,3; Chen, Kaiyun6; Yin, Xuebo1,2,3; Yang, Wenqiang6; Qi, Haiyan1,2,3 | |
| 2021-05-01 | |
| 发表期刊 | LITHOS
 |
| ISSN | 0024-4937 |
| 卷号 | 388页码:14 |
| 通讯作者 | Chen, Zuxing(chenzuxing@qdio.ac.cn) ; Zeng, Zhigang(zgzeng@ms.qdio.ac.cn) |
| 摘要 | Magmatic sulfide saturation and dissolution are increasingly thought to play important roles in controlling the behavior of chalcophile metals in arc-related magma. However, the mechanisms of these processes during magma evolution in the Okinawa Trough (OT) are still poorly known. Here, we firstly report magmatic sulfides characterized by variable oxidation and dissolution in basaltic andesites from the southern OT. Pyrrhotite (Po) is the main sulfide mineral identified in the clinopyroxene phenocrysts and groundmass in these rocks. Thermodynamic modeling suggests that the oxygen fugacity (fO(2)), temperature (T) and pressure (P) in equilibrium with Po are -Delta FMQ + 1.5,-1050 degrees C, and similar to 3 kbar, respectively. The positive Delta S-34(V-CDT) values (1.57 +/- 0.35 parts per thousand) of magmatic sulfides and the extremely nonradiogenic Sr and radiogenic Hf-Nd isotope compositions of the basaltic andesites (mean of Sr-87/Sr-86 = 0.703816, epsilon(Hf) = 17.72 and epsilon(Nd) = 6.19) indicate that the incorporation of external crustal sulfur is not the reason for sulfide saturation in the oxidized magma. Instead, sulfide saturation is driven by a decrease in the sulfur content at sulfide saturation (SCSS) due to changes in melt chemistry and dropping temperatures along with a concurrent increase in S contents during magmatic differentiation. The S content in the glasses (similar to 362 ppm) is far lower than the SCSS for the basaltic andesitic magma in the magma chamber (similar to 1 wt%), revealing that extensive S degassing occurred during final magma ascent and decompression. The associated drop in S fugacity (fS(2)) and increase in fO(2) induced resorption and oxidation of those sulfides, which were not shielded in the clinopyroxenes, to Fe-oxides and released their Cu and S back into the melt. These elements were then likely partitioned into the vapor phase, resulting in the formation of a metal-rich magmatic fluid emitted to the ocean during magma ascent and degassing. Therefore, magmatic sulfide saturation and dissolution play vital roles in controlling the behavior of chalcophile elements during magmatic differentiation and degassing. (C) 2021 Elsevier B.V. All rights reserved. |
| 关键词 | Magmatic sulfide Pyrrhotite Degassing Okinawa Trough Back-arc basin |
| DOI | 10.1016/j.lithos.2021.106082 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[91958213] ; Strategic Priority Research Program (B) of Chinese Academy of Sciences[XDB42020402] ; Shandong Provincial Natural Science Foundation, China[ZR2020QD069] ; Shandong Provincial Natural Science Foundation, China[ZR2020MD068] ; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2020KG11] ; National Programme on Global Change and Air-Sea Interaction[GASIGEOGE-02] ; International Partnership Program of Chinese Academy of Sciences[133137KYSB20170003] ; National Special Fund for the 13th Five Year Plan of COMRA[DY135-G2-102] ; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061] ; Qingdao Postdoctoral Applied Research Project ; National Key Basic Research Program of China[2013CB429700] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:000636394800002 |
| 出版者 | ELSEVIER |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/170261 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Chen, Zuxing; Zeng, Zhigang |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Seafloor Hydrothermal Act Lab, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Shandong, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Cent South Univ, Sch Geosci & Infophys, Changsha 410083, Peoples R China 6.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 通讯作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Chen, Zuxing,Zeng, Zhigang,Tamehe, Landry Soh,et al. Magmatic sulfide saturation and dissolution in the basaltic andesitic magma from the Yaeyama Central Graben, southern Okinawa Trough[J]. LITHOS,2021,388:14. |
| APA | Chen, Zuxing.,Zeng, Zhigang.,Tamehe, Landry Soh.,Wang, Xiaoyuan.,Chen, Kaiyun.,...&Qi, Haiyan.(2021).Magmatic sulfide saturation and dissolution in the basaltic andesitic magma from the Yaeyama Central Graben, southern Okinawa Trough.LITHOS,388,14. |
| MLA | Chen, Zuxing,et al."Magmatic sulfide saturation and dissolution in the basaltic andesitic magma from the Yaeyama Central Graben, southern Okinawa Trough".LITHOS 388(2021):14. |
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