Acta Oceanologica Sinica

, Volume 37, Issue 2, pp 14–24 | Cite as

Geochemical characteristics of major and trace elements in the Okinawa Trough basaltic glass

  • Kun Guo
  • Shikui Zhai
  • Zenghui Yu
  • Zhigang Zeng
  • Xiaoyuan Wang
  • Xuebo Yin
Article
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Abstract

The 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.

Keywords

Okinawa Trough basaltic glass geochemistry magmatic evolution subducted component 

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Notes

Acknowledgements

The authors thank Liu Guoqi for help with sample analysis. All authors are thankful to two anonymous reviewers for the thorough revision of the manuscript and their insightful comments.

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Copyright information

© The Chinese Society of Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Kun Guo
    • 1
    • 2
    • 3
  • Shikui Zhai
    • 3
  • Zenghui Yu
    • 3
  • Zhigang Zeng
    • 1
  • Xiaoyuan Wang
    • 1
  • Xuebo Yin
    • 1
  1. 1.Key Laboratory of Marine Geology and Environment, Institute of OceanologyChinese Academy of SciencesQingdaoChina
  2. 2.Laboratory for Marine GeologyQingdao National Laboratory for Marine Science and TechnologyQingdaoChina
  3. 3.Key Laboratory of Submarine Geosciences and Prospection of Ministry of EducationOcean University of ChinaQingdaoChina

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