| Integrated major and trace element study of clinopyroxene in basic, intermediate and acidic volcanic rocks from the middle Okinawa Trough: Insights into petrogenesis and the influence of subduction component | |
| Li, Xiaohui1,2,3; Zeng, Zhigang1,2,3,4; Yang, Huixin1; Zhao, Yuting5,6; Yin, Xuebo1,2,3; Wang, Xiaoyuan1,2,3; Chen, Shuai1,2,3; Qi, Haiyan1; Guo, Kun7 | |
| 2020 | |
| 发表期刊 | LITHOS
 |
| ISSN | 0024-4937 |
| 卷号 | 352页码:15 |
| 通讯作者 | Li, Xiaohui(lixiaohui@qdio.ac.cn) ; Zeng, Zhigang(zgzeng@qdio.ac.cn) |
| 摘要 | Magmatism is very common in the Okinawa Trough. However, the influence of magmatic processes, including fractional crystallization and magma mixing, on the petrogenesis of volcanic rocks is poorly understood. The in situ major and trace element compositions of clinopyroxene in co-genetic basalts, andesites, trachyandesites and rhyolites from the Iheya Ridge in the middle Okinawa Trough are examined to determine their petrogenesis and the influence of slab subduction. Regarding the types of mineral zoning, in basalt and andesite, dinopyroxene phenocrysts are unzoned. In trachyandesite, the clinopyroxene phenocrysts can be classified into three groups: normal zoned, oscillatory zoned and unzoned. Similarly, unzoned and reverse zoned clinopyroxene phenocrysts are the two main structures in rhyolites. According to the major element contents and distinct distribution patterns of rare earth elements (REEs), we identify various clinopyroxene domains in their host volcanic rocks. Type 1 dinopyroxene domains in basalts and trachyandesites are dark, have high Mg-# values and are strongly depleted in light REEs (LREEs) with no significant Eu anomalies. The Type 2 clinopyroxene domains in basalts and trachyandesites and all clinopyroxene phenocrysts in andesites are bright, have low Mg-# values and are strongly depleted in LREEs and have significant negative Eu anomalies. Clinopyroxene domains in rhyolites have significant negative Eu anomalies and can be divided into two types: Type 1 clinopyroxene domains are characterized by strong depletion in LREEs, Sr, P and high field strength elements (HFSEs), while Type 2 clinopyroxene domains are slightly depleted in LREEs and have small negative P anomalies. The continuously changing major element composition and parallel distribution of trace element spider diagrams suggest that all these clinopyroxene phenocrysts in the studied volcanic rocks were derived from co-genetic magmas and the compositional transition of dinopyroxene from basalts to rhyolites attributed to different extents of fractional crystallization of various minerals (e.g., clinopyroxene, orthopyroxene, plagioclase and apatite). The oscillatory zoned and reversed zoned clinopyroxene phenocrysts show that magma mixing and recharge events with co-genetic magmas are common in the middle Okinawa Trough magma system. The origin of clinopyroxene phenocrysts involves contributions from subducted sedimentary components of 2.5% sediment melts and 1.5% sediment fluids and is deduced based on the equilibrium melts of clinopyroxene phenocrysts in basalts. The geochemical study of clinopyroxene provides evidence for the contributions of magmatic processes and slab subduction to the petrogenesis of Okinawa Trough volcanic rocks. (C) 2019 Published by Elsevier B.V. |
| 关键词 | Clinopyroxene phenocrysts Zoning patterns Fractional crystallization Magma mixing Okinawa Trough |
| DOI | 10.1016/j.lithos.2019.105320 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[91958213] ; National Programme on Global Change and Air-Sea Interaction[GASI-GEOGE-02] ; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2019KG07] ; International Partnership Program of Chinese Academy of Sciences[133137KYSB20170003] ; National Special Fund for the 13th Five Year Plan of COMRA[DY135-G2-1-02] ; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061] ; Shandong Provincial Natural Science Foundation, China[ZR2019BD010] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:000515201500004 |
| 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/337002/165614 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Li, Xiaohui; Zeng, Zhigang |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Qingdao Geoengn Explorat Inst, Qingdao 266000, Peoples R China 6.Shandong Prov Bur Geol & Mineral Resources, Key Lab Urban Geol & Underground Space Resources, Qingdao 266000, Peoples R China 7.Qingdao Natl Lab Marine Sci & Technol, Ctr Isotope Geochem & Geochronol, Qingdao 266237, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所; 中国科学院海洋大科学研究中心 |
| 通讯作者单位 | 中国科学院海洋研究所; 中国科学院海洋大科学研究中心 |
| 推荐引用方式 GB/T 7714 | Li, Xiaohui,Zeng, Zhigang,Yang, Huixin,et al. Integrated major and trace element study of clinopyroxene in basic, intermediate and acidic volcanic rocks from the middle Okinawa Trough: Insights into petrogenesis and the influence of subduction component[J]. LITHOS,2020,352:15. |
| APA | Li, Xiaohui.,Zeng, Zhigang.,Yang, Huixin.,Zhao, Yuting.,Yin, Xuebo.,...&Guo, Kun.(2020).Integrated major and trace element study of clinopyroxene in basic, intermediate and acidic volcanic rocks from the middle Okinawa Trough: Insights into petrogenesis and the influence of subduction component.LITHOS,352,15. |
| MLA | Li, Xiaohui,et al."Integrated major and trace element study of clinopyroxene in basic, intermediate and acidic volcanic rocks from the middle Okinawa Trough: Insights into petrogenesis and the influence of subduction component".LITHOS 352(2020):15. |
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