Journal Article

Microbiology and geochemistry in a hydrogen-sulphide-rich karst environment

Hose, L.D., Palmer, A.N., Palmer, M.V., Northup, D.E., Boston, P.J. and Duchene, H.R.

Record Number:
4328
Year:
2000
Journal:
Chemical Geology
Pages:
399-423
Volume:
169
Abstract:
Cueva de Villa Luz, a hypogenic cave in Tabasco, Mexico, offers a remarkable opportunity to observe chemotrophic microbial interactions within a karst environment. The cave water and atmosphere are both rich in hydrogen sulphide. Measured H2S levels in the cave atmosphere reach 210 ppm, and SO2 commonly exceeds 35 ppm. These gases, plus oxygen from the cave air, are absorbed by freshwater that accumulates on cave walls from infiltration and condensation. Oxidation of sulphur and hydrogen sulphide forms concentrated sulphuric acid. Drip waters contain mean pH values of 1.4, with minimum values as low as 0.1. The cave is fed by at least 26 groundwater inlets with a combined flow of 200–300 lrs. Inlet waters fall into two categories: those with high H2S content 300–500 mgrl., mean PCO s0.03–0.1 atm, and no measurable O2; and those 2 with less than 0.1 mgrl H2S, mean PCO s0.02 atm, and modest O2 content up to 4.3 mgrl.. Both water types have a 2 similar source, as shown by their dissolved solid content. However, the oxygenated water has been exposed to aerated conditions upstream from the inlets so that original H2S has been largely lost due to outgassing and oxidation to sulphate, increasing the sulphate concentration by about 4%. Chemical modelling of the water shows that it can be produced by the dissolution of common sulphate, carbonate, and chloride minerals. Redox reactions in the cave appear to be microbially mediated. Sequence analysis of small subunit 16S. ribosomal RNA genes of 19 bacterial clones from microbial colonies associated with water drips revealed that 18 were most similar to three Thiobacilli spp., a genus that often obtains its energy from the oxidation of sulphur compounds. The other clone was most similar to Acidimicrobium ferrooxidans, a moderately thermophilic, mineral-sulphide-oxidizing bacterium. Oxidation of hydrogen sulphide to sulphuric acid, and hence the cave enlargement, is probably enhanced by these bacteria. Two cave-enlarging processes were identified. 1. Sulphuric acid derived from oxidation of the hydrogen sulphide converts subaerial limestone surfaces to gypsum. The gypsum falls into the cave stream and is dissolved. 2. Strongly acidic droplets form on the gypsum and on microbial filaments, dissolving limestone where they drip onto the cave floors. The source of the H2S in the spring waters has not been positively identified. The Villahermosa petroleum basin within 50 km to the northwest, or the El Chicho´n volcano ;50 km to the west, may serve as source areas for the rising water. Depletion of 34S values 11.7‰ for sulphur stabilized from H S in the cave atmosphere., along with the hydrochemistry 2 of the spring waters, favour a basinal source.
Times Cited:
1
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