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© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Two rivers from Taiwan with different source inputs, the Danshuei (polluted) and Liwu (non-polluted), were selected to study the behavior of molybdenum (Mo) isotopes during weathering and riverine transport. In the Danshuei River, δ98/95Mo ranges from 0.83‰ to 1.50‰ (wet season) and 0.54‰ to 1.25‰ (dry season). With a few exceptions, δ98/95Mo in the Danshuei River is lighter during the wet season, while, in contrast, heavier in the dry season. In the Liwu River, δ98/95Mo varies from 0.54‰ to 1.30‰ and gets heavier along the mainstream. Using the MixSIAR model, three Mo sources are identified in the Danshuei River: seawater intrusion, rock–water interaction, and anthropogenic inputs. Seawater intrusion can explain the heavy δ98/95Mo downstream signal during the wet season contributing 14–39% from the MixSIAR model. However, the lighter δ98/95Mo signal during the dry season is most likely due to anthropogenic inputs in the middle and lower reaches of the Danshuei River contributing 75–98%. In the Liwu River, dissolved Mo isotopes correlate with SO42−/Na and (Sr/Na) ×1000 ratio, suggesting that pyrite oxidation coupled with carbonate weathering governs the heavy δ98/95Mo signature, with sequestration of light δ98/95Mo into secondary mineral phases in bedload sediments. Furthermore, these results have important implications for riverine Mo sources to the ocean, controlled by anthropogenic activity and weathering processes.

Details

Title
Molybdenum Isotopic Fingerprints in Taiwan Rivers: Natural versus Anthropogenic Sources
Author
Ekka, Shail Vijeta 1   VIAFID ORCID Logo  ; Yu-Hsuan, Liang 2 ; Kuo-Fang, Huang 3   VIAFID ORCID Logo  ; Der-Chuen, Lee 3   VIAFID ORCID Logo 

 Taiwan International Graduate Program-Earth System Science (TIGP-ESS), Academia Sinica and National Central University, Taipei 11529, Taiwan; [email protected] (S.V.E.); [email protected] (K.-F.H.); Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan; [email protected]; Department of Earth Sciences, National Central University, Taoyuan 32001, Taiwan 
 Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan; [email protected] 
 Taiwan International Graduate Program-Earth System Science (TIGP-ESS), Academia Sinica and National Central University, Taipei 11529, Taiwan; [email protected] (S.V.E.); [email protected] (K.-F.H.); Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan; [email protected] 
First page
1873
Publication year
2023
Publication date
2023
Publisher
MDPI AG
e-ISSN
20734441
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2819465481
Copyright
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.