Fate of sulfide in the Frasassi cave system and implications for sulfuric acid speleogenesis

Citation

Material Information

Title:
Fate of sulfide in the Frasassi cave system and implications for sulfuric acid speleogenesis
Series Title:
Chemical Geology
Creator:
Jones, Daniel S.
Polerecky, Lubos
Galdenzi, Sandro
Dempsey, Brian A.
Macalady, Jennifer L.
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Cave ( local )
Karst ( local )
Hydrogen Sulfide ( local )
Geomicrobiology ( local )
Sulfur-Oxidizing Bacteria ( local )
Sulfuric Acid ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
The oxidation of hydrogen sulfide (H2S) has led to the formation of some of the world's largest caves through a process known as sulfuric acid speleogenesis (SAS). Here we present a multi-year study of the large, sulfidic, and actively-forming Frasassi cave system, Italy. We show that despite the presence of abundant sulfide-oxidizing biofilms in Frasassi streams, H2S(g) degassing to the cave atmosphere was the major sink for dissolved sulfide. Degassing rates ranged from 0.9 to 80 μmol m− 2 s− 1, whereas microbial oxidation rates were between 0.15 and 2.0 μmol m− 2 s− 1. Furthermore, microsensor measurements showed that sulfuric acid is not a major end product of microbial sulfide oxidation in the streams. Our results suggest that subaerial SAS will be important for karstification, and more important than subaqueous SAS, wherever ground waters with high sulfide concentrations emerge as flowing streams in contact with cave air.
Original Version:
Chemical Geology, Vol. 410, no. 2 (2015-09-02).

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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University of South Florida
Karst Information Portal

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