Systematic differences in boron isotope compositions between mid-ocean ridge and back-arc basin hydrothermal fluids

Zhang Xia; Yu Zenghui; Zhai Shikui; Yang Zhifeng; Xu Jie

doi:10.3969/j.issn.0253-4193.2019.11.007

Volume 41 Issue 11

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Zhang Xia，Yu Zenghui，Zhai Shikui, et al. Systematic differences in boron isotope compositions between mid-ocean ridge and back-arc basin hydrothermal fluids[J]. Haiyang Xuebao，2019, 41(11)：64–74，doi:10.3969/j.issn.0253−4193.2019.11.007

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Systematic differences in boron isotope compositions between mid-ocean ridge and back-arc basin hydrothermal fluids

doi: 10.3969/j.issn.0253-4193.2019.11.007

Zhang Xia^{1, 2
,},
Yu Zenghui^{1, 2},
Zhai Shikui^{1, 2
,
,},
Yang Zhifeng^{1, 2},
Xu Jie^{1, 2}

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2.
Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China

Received Date: 2018-10-08
Rev Recd Date: 2019-05-06

Available Online: 2021-04-21

Publish Date: 2019-11-25

Abstract

Abstract

Boron is a common element in vent fluids of seafloor hydrothermal fields. Due to its typical fluid-mobility and distinct isotope compositions in different reservoirs, boron has been largely applied to trace metal sources, water/rock interaction and sediment contribution to hydrothermal fluids. Up to date, the B contents and its isotope compositions in hydrothermal fluids from the major seafloor hydrothermal fields have been studied sufficiently, but the comparisons of B behavior in different geological settings are relatively limited and the reasons causing the systematic differences in elements and isotope compositions of hydrothermal fluids are still unclear. In this paper, the sources of B in hydrothermal fluids from different geological settings were calculated based on B contents and its isotope compositions, meanwhile, the causes of systematic differences in B isotope compositions between mid-ocean ridge and back-arc basin hydrothermal fluids were discussed. Results show that the δ¹¹B values of hydrothermal end member fluids from different hydrothermal fields have large variations, which mainly results from the mixing of B from difference sources in different proportions. Boron in mid-ocean ridge and sediment-starve back-arc basin hydrothermal fluids are mainly from the mixing of seawater and basement-derived B, the contribution of magmatic volatiles to sediment-starve back-arc basin hydrothermal systems is the major causes of B isotope composition differences in these two geological settings. Moreover, the differences in geochemical compositions of basement rocks and degrees of water/rock interaction also cause the differences in B isotope compositions to some extent. While the δ¹¹B values of hydrothermal end member fluids from sediment-covered hydrothermal fields are extremely low and contribution of sediment-derived B to hydrothermal fluid is the major cause of this phenomenon. Moreover, sediment absorption also causes the B isotope variation to some extent. In sediment-covered mid-ocean ridge hydrothermal fields, the B isotope compositions of hydrothermal fluids are also influenced by the incorporation of sediment-derived B and have relatively lower δ¹¹B values. Compared with the Okinawa Trough, the degrees of sediment absorption in sediment-covered mid-ocean ridge hydrothermal fluids are more intensely. Based on these analysis, we put forward the mechanism causing systematic differences in B isotope compositions of hydrothermal fluids from mid-ocean ridge and back-arc basins.
- hydrothermal fluids,
- boron isotope compositions,
- systematic differences,
- mid-ocean ridge,
- back-arc basin

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