| Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection | |
Li, Xiaohui1,2; Zeng, Zhigang1,2,3,4 ; Yang, Huixin1; Yin, Xuebo1; Wang, Xiaoyuan1,3; Chen, Shuai1,3; Ma, Yao1; Guo, Kun1,3,5
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| 2019-05-01 | |
| 发表期刊 | GEOLOGICAL JOURNAL
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| ISSN | 0072-1050 |
| 卷号 | 54期号:3页码:1160-1189 |
| 摘要 | Silicate melt inclusions (SMIs) in olivine, clinopyroxene, and orthopyroxene in basalt and trachyandesite of the middle Okinawa Trough (MOT) and in basaltic andesites of the southern Okinawa Trough (SOT) were investigated in detail to understand the evolution of magma and geochemical characteristics of the basaltic magma source. Both the SMIs and host bulk rocks are more heavily enriched with Pb and large ion lithophile elements than with high field strength elements and rare earth elements. The major element compositions of SMIs in the MOT trachyandesite show a scattered variation trend of medium-K to shoshonitic series and suggest that a K-rich magma source may exist in the Okinawa Trough. Two groups with distinct element distribution patterns observed in SMIs of the MOT trachyandesite may represent magmas with different evolutionary histories. Compared with fractional crystallization and partial melting processes, magma mixing may serve as a reasonable process for the production of trachyandesite in the MOT. Fractional crystallization has played an important role in basaltic magma evolution in the MOT and SOT. Simulations conducted using MELTS show that the fractional crystallization evolution trends observed correspond well to the presence of a magma chamber at 300MPa with an H2O content level of 0.2wt% in the MOT and to the presence of a magma chamber at 300MPa with an H2O content level of 0.4wt% in the SOT. Ratios of incompatible trace elements (e.g., Th/Ce, Th/Sm, Ba/Th, and Th/Nb); positive Pb anomalies; negative Nb, Ta, and Ti anomalies; and the existence of organic hydrocarbons (CnHm) in the SMIs can be attributed to the involvement of subducted sediment from the subducting slab. Modelling results suggest that more primitive magma represented by SMIs from the MOT has formed through the melting of less than 6% of a metasomatized depleted mantle with contributions of 1.2% sediment melt and 0.8% sediment fluid. In contrast, more primitive magma from the SOT formed through the melting of 4-10% of the depleted mantle with contributions of 3% sediment melt and 1% sediment fluid. The different features of the SMIs together with different tectonic settings of the MOT and SOT have formed in response to the westward subduction of the Philippine Sea Plate. |
| 关键词 | basaltic magma K-rich magma source Okinawa Trough silicate melt inclusions subducted sediment components |
| DOI | 10.1002/gj.3217 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology[MGQNLM-KF201707]###2345; Scientific and Technological Innovation Project - Qingdao National laboratory for Marine Science and Technology[2015ASKJ03]###1710; Scientific and Technological Innovation Project - Qingdao National Laboratory for Marine Science and Technology[2016ASKJ13]###1084; National Natural Science Foundation of China[41706052]###788; National Natural Science Foundation of China[41476044]###787; Qingdao Collaborative Innovation Center of Marine Science and Technology###90; CAS/SAFEA International Partnership Program for Creative Research Teams###89; National High Level Talent Special Support Program###88; Special Fund for the Global Change and Air-Sea Interaction Project[GASI-GEOGE-02]###87; Science and Technology Development Program of Shandong Province[2013GRC31502]###53; Innovative Talent Promotion Program[2012RA2191]###52; Qingdao National Laboratory for Marine Science and Technology[2015ASTP-0S17]###49; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061]###47; International Partnership Program of Chinese Academy of Sciences[133137KYSB20170003]###46; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11030302]###45; National Key Basic Research Program of China[2013CB429700]###44; National Natural Science Foundation of China[41325021]###42; National Natural Science Foundation of China[41325021]; National Key Basic Research Program of China[2013CB429700]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11030302]; International Partnership Program of Chinese Academy of Sciences[133137KYSB20170003]; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061]; Qingdao National Laboratory for Marine Science and Technology[2015ASTP-0S17]; Innovative Talent Promotion Program[2012RA2191]; Science and Technology Development Program of Shandong Province[2013GRC31502]; Special Fund for the Global Change and Air-Sea Interaction Project[GASI-GEOGE-02]; National High Level Talent Special Support Program; CAS/SAFEA International Partnership Program for Creative Research Teams; Qingdao Collaborative Innovation Center of Marine Science and Technology; National Natural Science Foundation of China[41476044]; National Natural Science Foundation of China[41706052]; Scientific and Technological Innovation Project - Qingdao National Laboratory for Marine Science and Technology[2016ASKJ13]; Scientific and Technological Innovation Project - Qingdao National laboratory for Marine Science and Technology[2015ASKJ03]; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology[MGQNLM-KF201707] |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000465392600004 |
| 出版者 | WILEY |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 版本 | 出版稿 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/161238 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Zeng, Zhigang |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Shandong, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Shandong, Peoples R China 4.Qingdao Collaborat Innovat Ctr Marine Sci & Techn, Qingdao, Shandong, Peoples R China 5.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao, Shandong, 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 | Li, Xiaohui,Zeng, Zhigang,Yang, Huixin,et al. Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection[J]. GEOLOGICAL JOURNAL,2019,54(3):1160-1189. |
| APA | Li, Xiaohui.,Zeng, Zhigang.,Yang, Huixin.,Yin, Xuebo.,Wang, Xiaoyuan.,...&Guo, Kun.(2019).Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection.GEOLOGICAL JOURNAL,54(3),1160-1189. |
| MLA | Li, Xiaohui,et al."Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection".GEOLOGICAL JOURNAL 54.3(2019):1160-1189. |
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