Influence of dual sulfate reduction pathways on pore-fluid chemistry and occurrences of methane hydrate in sediment cores (IODP-353) off Mahanadi basin, Bay of Bengal

Peketi, A.; Mazumdar, Aninda; Pillutla, S P K; Patil, D. J.

doi:10.2343/geochemj.2.0576

Cited by 4 publications

(1 citation statement)

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“…Thus, liquid water is strongly enriched in heavy isotopes with respect to H 2 S and CH 4 . Based on the presence of sulfate-reducing bacteria and methanogenic archaea in the analysed C5-waters, we suggest two possible explanations for the high hydrogen isotope values: (1) interaction of water with gaseous H 2 S and/or CH 4 coming from the surrounding environment, and (2) generation of H 2 S and CH 4 by reduction of oxidised sulfur and carbon species involving the H component of the water (Equations (4) and (5)) [94,95]:…”

Section: Hydrogeological Modelmentioning

confidence: 86%

Hydrogeological Behaviour and Geochemical Features of Waters in Evaporite-Bearing Low-Permeability Successions: A Case Study in Southern Sicily, Italy

et al. 2020

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Knowledge about the hydrogeological behaviour of heterogeneous low-permeability media is an important tool when designing anthropogenic works (e.g., landfills) that could potentially have negative impacts on the environment and on people’s health. The knowledge about the biogeochemical processes in these media could prevent “false positives” when studying groundwater quality and possible contamination caused by anthropogenic activities. In this research, we firstly refined knowledge about the groundwater flow field at a representative site where the groundwater flows within an evaporite-bearing low-permeability succession. Hydraulic measurements and tritium analyses demonstrated the coexistence of relatively brief to very prolonged groundwater pathways. The groundwater is recharged by local precipitation, as demonstrated by stable isotopes investigations. However, relatively deep groundwater is clearly linked to very high tritium content rainwater precipitated during the 1950s and 1960s. The deuterium content of some groundwater samples showed unusual values, explained by the interactions between the groundwater and certain gases (H2S and CH4), the presences of which are linked to sulfate-reducing bacteria and methanogenic archaea detected within the saturated medium through biomolecular investigations in the shallow organic reach clayey deposits. In a wider, methodological context, the present study demonstrates that interdisciplinary approaches provide better knowledge about the behaviour of heterogeneous low-permeability media and the meaning of each data type.

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Section: Hydrogeological Modelmentioning

confidence: 86%