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Arsenic and thioarsenic species in the hot springs of the Rehai magmatic geothermal system, Tengchong volcanic region, China

Title data

Guo, Qinghai ; Planer-Friedrich, Britta ; Liu, Mingliang ; Li, Jiexiang ; Zhou, Chao ; Wang, Yanxin:
Arsenic and thioarsenic species in the hot springs of the Rehai magmatic geothermal system, Tengchong volcanic region, China.
In: Chemical Geology. Vol. 453 (March 2017) . - pp. 12-20.
ISSN 0009-2541
DOI: https://doi.org/10.1016/j.chemgeo.2017.02.010

Abstract in another language

Rehai is the sole geothermal area in mainland China that discharges both acidic and alkaline hot springs with pHs ranging from 1.4 to 10.0. The hot springs in Rehai are also characterized by a wide range of arsenic concentrations, with the highest being 1.35 mg/L. Analysis of the arsenic geochemistry indicates that the alkaline and neutral hot springs in Rehai have high arsenic concentrations. The alkaline hot springs represent arsenic-rich boiled reservoir fluids, and the neutral hot springs represent mixtures of these reservoir fluids with non-thermal waters and/or condensed steam. The enrichment of arsenic in the deep reservoir fluids, also called “primary fluids”, is primarily attributable to the leaching of reservoir rocks at high temperatures, but a possible arsenic contribution from magmatic fluids cannot be ruled out. The acidic springs, in contrast, have much lower arsenic concentrations because they are a mixture of non-thermal oxygenated waters and condensed steam, both of which are depleted in arsenic. In addition to arsenite and arsenate, mono-, di-, and tri-thioarsenates have been detected in the Rehai geothermal waters. The arsenic speciation in the Rehai hot springs is primarily linked to the formation processes of the various secondary fluids at the surface and their sulfide concentrations. In addition, the speciation is also affected by the pH values and the redox potentials of the waters. Compared to the springs along secondary E-W-trending faults, the chloride-rich springs along the main N-S-trending faults are generally much less affected by mixing with non-thermal waters and/or condensed steam. They are also more enriched in sulfide, and thioarsenates consequently represent a greater proportion of the total arsenic. This is the first study to report the thioarsenic geochemistry of hot springs in China.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER139698
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group > Professorship Environmental Geochemistry - Univ.-Prof. Dr. Britta Planer-Friedrich
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 08 Jan 2018 09:48
Last Modified: 08 Jan 2018 09:48
URI: https://eref.uni-bayreuth.de/id/eprint/41192