Direct H2S, HS and pH Measurements of High‐Temperature Hydrothermal Vent Fluids With In Situ Raman Spectroscopy

Author:

Li Lianfu123,Li Zimeng4,Zhong Richen4ORCID,Du Zengfeng13ORCID,Luan Zhendong13,Xi Shichuan13,Zhang Xin123ORCID

Affiliation:

1. CAS Key Laboratory of Marine Geology and Environment Center of Deep Sea Research Institute of Oceanology Center for Ocean Mega‐Science Chinese Academy of Sciences Qingdao China

2. Laboratory for Marine Geology LaoShan Laboratory Qingdao China

3. University of Chinese Academy of Sciences Beijing China

4. School of Civil and Resource Engineering University of Science and Technology Beijing Beijing China

Abstract

AbstractHydrothermal H2S is an important energy source for hydrothermal ecosystems. However, it is difficult to obtain accurate hydrogen sulfide concentrations in high‐temperature hydrothermal fluids because they are highly susceptible to oxidation and compositional variability with mixing. In this study, a new in situ approach for measuring H2S, HS and pH in hydrothermal fluids was developed and applied to the detections of Okinawa Trough hydrothermal activities. The in situ total H2S concentrations in the Jade and Biwako fluids were determined to be 31.4 and 76.7 mmol/kg, respectively. The in situ measured pH of the Jade fluids was determined to be 6.3, which has exceeded that of a neutral fluid at a specific temperature and pressure, indicating that the pH of Jade fluids is weakly alkaline. The pH transition of hydrothermal fluids from alkaline to acidic may be attributed to the thermal decomposition of organic matter and sulfide precipitation.

Funder

National Natural Science Foundation of China

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Geophysics

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