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

Titelangaben

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. Bd. 453 (März 2017) . - S. 12-20.
ISSN 0009-2541
DOI: https://doi.org/10.1016/j.chemgeo.2017.02.010

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER139698
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Umweltgeochemie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Umweltgeochemie > Professur Umweltgeochemie - Univ.-Prof. Dr. Britta Planer-Friedrich
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 08 Jan 2018 09:48
Letzte Änderung: 08 Jan 2018 09:48
URI: https://eref.uni-bayreuth.de/id/eprint/41192