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Geochemical characteristics of major and trace elements in the Okinawa Trough basaltic glass
Guo, Kun1,2,3; Zhai, Shikui3; Yu, Zenghui3; Zeng, Zhigang1; Wang, Xiaoyuan1; Yin, Xuebo1
2018-02-01
Source PublicationACTA OCEANOLOGICA SINICA
Volume37Issue:2Pages:14-24
SubtypeArticle
AbstractThe Okinawa Trough (OT) is a back-arc basin at an initial spreading stage that is under the influence of subduction of the Philippine Sea Plate. In this study, we analyzed the geochemical compositions of basaltic glass in the OT and discussed the effects of different magmatic sources, evolution, and subducted components in basalts. Our results showed that the middle and southern regions of the OT exhibit characteristics consistent with an iron-rich tholeiite series. Trace element proportions conform to the typical spider diagram pattern characteristic of back-arc basin basalts, rich in large ion lithophile elements (LILEs) including Rb, Ba, Pb, U, and Th, while depleted in high field-strength elements (HFSEs) including Nb, Ta, Zr, Hf, and Ti. The distribution of rare earth elements (REEs) is also consistent with enrichment by right-leaning light rare earth elements (LREEs). The addition of enriched mantle type I (EMI) materials as well as mantle heterogeneity may have led to variable degrees of enrichment in different regions. The magma source of the middle trough has undergone crystallization towards pyroxene, while development of plagioclase was restricted partly, and the crystallization of spinel and olivine ceased altogether. At the same time, crystallization of the southern OT magma source was dominated by olivine and including the formation of plagioclase, pyroxene, and magnetite (or titanomagnetite). Finally, the results of this study showed that 90% Th, 95% Ba in the southern basalt, 50%-70% Th and 70%-90% Ba in the middle basalt originated from subducted component. Different subducted component influence may be due to different subduction zone structural feature.
KeywordOkinawa Trough Basaltic Glass Geochemistry Magmatic Evolution Subducted Component
DOI10.1007/s13131-017-1075-2
Indexed BySCI
Language英语
WOS IDWOS:000425168200002
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/154363
Collection海洋地质与环境重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266071, Peoples R China
3.Ocean Univ China, Key Lab Submarine Geosci & Prospect, Minist Educ, Qingdao 266100, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
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Guo, Kun,Zhai, Shikui,Yu, Zenghui,et al. Geochemical characteristics of major and trace elements in the Okinawa Trough basaltic glass[J]. ACTA OCEANOLOGICA SINICA,2018,37(2):14-24.
APA Guo, Kun,Zhai, Shikui,Yu, Zenghui,Zeng, Zhigang,Wang, Xiaoyuan,&Yin, Xuebo.(2018).Geochemical characteristics of major and trace elements in the Okinawa Trough basaltic glass.ACTA OCEANOLOGICA SINICA,37(2),14-24.
MLA Guo, Kun,et al."Geochemical characteristics of major and trace elements in the Okinawa Trough basaltic glass".ACTA OCEANOLOGICA SINICA 37.2(2018):14-24.
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