Subaerial sulfate mineral formation related to acid aerosol at Zhenzhu Spring, Tengchong, China

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Marco E. Ciriotti
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Subaerial sulfate mineral formation related to acid aerosol at Zhenzhu Spring, Tengchong, China

Messaggio da Marco E. Ciriotti » lun 14 gen, 2019 16:19

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Referenza:
▪ Luo, L., Wen, H., Zheng, R., Liu, R., Li, Yi, Luo, X., You, Y. (2018): Subaerial sulfate mineral formation related to acid aerosol at Zhenzhu Spring, Tengchong, China. Mineralogical Magazine, 82, (in press).

Abstract:
Zhenzhu Spring, located in the Tengchong volcanic field, Yunnan, China, is an acid hot spring with high SO42- concentrations and intense acid aerosol generation. In order to understand the formation mechanism of sulfate minerals at Zhenzhu Spring and provide a better insight into the sulfur isotope geochemistry of the associated Rehai hydrothermal system, we investigated the spring water hydrochemistry, mineralogy, major element geochemistry of sulfate minerals at Zhenzhu Spring and the sulfur-oxygen isotope geochemistry of sulfur-containing materials at Rehai geothermal field and compared the isotope results with those in other steam-heated environments. Subaerial minerals include a wide variety of sulfate minerals (gypsum, alunogen, pickeringite, tamarugite, magnesiovoltaite, and a minor Mg-S-O phase) and amorphous SiO2. The δ34S values of the subaerial sulfate minerals at Zhenzhu Spring varied subtly from -0.33 to 1.88‰ and were almost consistent with the δ34S values of local H2S (-2.6 to 0.6‰) and dissolved SO42- (-0.2 to 5.8‰), while the δ18O values (-8.94 to 20.1‰) were between that of the spring waters (-10.19 to -6.7‰) and atmospheric O2 (about 23.88‰). The results suggest that most of the sulfate minerals are derived from the oxidation of H2S, similar to many sulfate minerals from modern steam-heated environments. However, the rapid environmental change (different ratio of atmospheric and water oxygen) at Zhenzhu Spring account for the large variation of δ18O. The formation of subaerial sulfate minerals around Zhenzhu Spring is related to the acid aerosol (vapor and acid droplets). The intense activity of spring water around vents supply the aerosol with H2SO4 (H2S oxidation and acid droplets formed by bubble bursting) and few cations. Deposition of the acid sulfate aerosol forms the acid condensate, which attacks the underlying rocks and releases many cations and anions to form subaerial sulfate minerals at Zhenzhu Spring.
Marco E. Ciriotti

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