Xiao, Jun;
Zhao, Zhiqi;
Bouchez, Julien;
Ma, Xiaolin;
Pogge von Strandmann, Philip AE;
Araoka, Daisuke;
Yoshimura, Toshihiro;
... Jin, Zhangdong; + view all
(2023)
Geothermal input significantly influences riverine and oceanic boron budgets.
Earth and Planetary Science Letters
, 621
, Article 118397. 10.1016/j.epsl.2023.118397.
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Abstract
The evolution of boron isotope compositions of seawater (δ11Bsw) over the Cenozoic has important implications for reconstructions of atmospheric CO2 and is tightly linked to boron input from the Himalaya-Tibetan Plateau. However, controls on evolution inδ11Bsw remain elusive. We report geochemical measurements of the Yarlung Tsangpo River draining the Tibetan Plateau and observe exceptionally high riverine boron concentrations and extremely low δ11B values. Calculation indicates that >50% of riverine boron is sourced from geothermal waters. Combined with global datasets, we show that global riverine boron input to the ocean is largely influenced by geothermal input. Mass-balance calculations indicate that an averaged 1.5-fold decrease in global geothermal inputs is sufficient to introduce 3 increase in Cenozoic δ11Bsw. Therefore, geothermal waters significantly affect global riverine and thus oceanic boron budgets. The increased δ11Bsw since the Cenozoic may be resulted partly from declining global geothermal activity.
| Type: | Article |
|---|---|
| Title: | Geothermal input significantly influences riverine and oceanic boron budgets |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.epsl.2023.118397 |
| Publisher version: | https://doi.org/10.1016/j.epsl.2023.118397 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Boron isotope; chemical weathering; geothermal water input; boron budgets; Yarlung Tsangpo River |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10179685 |
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