scholarly journals Sr, S, and O Isotope Compositions of Evaporites in the Lanping–Simao Basin, China

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 96
Author(s):  
Lijian Shen ◽  
Licheng Wang ◽  
Chenglin Liu ◽  
Yanjun Zhao
Keyword(s):  
Sulfate Reduction ◽  
Oxygen Isotope ◽  
Significant Role ◽  
Drainage Basin ◽  
Bacterial Sulfate Reduction ◽  
Red Beds ◽  
Marine Transgression ◽  
Single Section ◽  
O Isotope ◽  
Cretaceous Period

Evaporites are widely distributed within continental “red beds” in the Lanping–Simao Basin, west Yunnan, China. Sr (Strontium), S (Sulfur), and O (Oxygen) isotope compositions have been measured on 54 sulfate or/and sulfate-bearing samples collected from Lanping, Nuodeng, Jinggu, Mengyejing, Baozang throughout the Lanping–Simao Basin. The 87Sr/86Sr ratios of all samples (0.708081 to 0.710049) are higher than those of contemporaneous seawater, indicating a significant continental contribution to the drainage basin. Sulfates in the Lanping Basin have higher 87Sr/86Sr ratios (0.709406 to 0.710049) than those (0.708081 to 0.709548) in the Simao Basin. Nevertheless, the δ34S values of gypsums (13.4‰ to 17.6‰) in Lanping and Baozang fall within the range of Cretaceous seawater. Gypsums from a single section in Baozang have trends of decreasing δ34S values and increasing 87Sr/86Sr ratios from base to top, indicating continental input played an increasingly significant role with the evaporation of brines. High δ34S values (20.5‰ to 20.7‰) of celestites in Lanping are probably caused by bacterial sulfate reduction (BSR) process in which 34S were enriched in residual sulfates and/or recycling of Triassic evaporites. The reduced δ34S values of gypsums (9.5‰ to 10.4‰) in Nuodeng could have been caused by oxidation of sulfides weathered from Jinding Pb-Zn deposit. The complex O isotope compositions indicate that sulfates in the Lanping–Simao Basin had undergone sulfate reduction, re-oxidation, reservoir effects, etc. In conclusion, the formation of continental evaporites was likely derived from seawater due to marine transgression during the Cretaceous period. Meanwhile, non-marine inflows have contributed to the basin significantly.

scholarly journals Coupled sulfur and oxygen isotope insight into bacterial sulfate reduction in the natural environment

2013 ◽  
Vol 118 ◽  
pp. 98-117 ◽  
Author(s):  
Gilad Antler ◽  
Alexandra V. Turchyn ◽  
Victoria Rennie ◽  
Barak Herut ◽  
Orit Sivan
Keyword(s):  
Sulfate Reduction ◽  
Oxygen Isotope ◽  
Natural Environment ◽  
Bacterial Sulfate Reduction ◽  
Insight Into

Dissimilatory bacterial sulfate reduction in montana groundwaters

1980 ◽  
Vol 2 (1) ◽  
pp. 83-98 ◽  
Author(s):  
William S. Dockins ◽  
Gregory J. Olson ◽  
Gordon A. McFeters ◽  
Susan C. Turbak
Keyword(s):  
Sulfate Reduction ◽  
Bacterial Sulfate Reduction

scholarly journals Microscale effects of oxygen and light on bacterial sulfate reduction in organic-rich lacustrine sediments

2019 ◽  
Vol 98 ◽  
pp. 11004
Author(s):  
Alfonso Menchén ◽  
Nicolas Valiente ◽  
Beatriz Toledo ◽  
Juan José Gómez-Alday
Keyword(s):  
Sulfate Reduction ◽  
Water Column ◽  
Redox Reactions ◽  
Lacustrine Sediments ◽  
Chemical Species ◽  
Bacterial Sulfate Reduction ◽  
Se Spain ◽  
Reduction Processes ◽  
Anoxic Zones ◽  
Sediment Interface

Biogeochemical cycling involves the exchange of electrons between chemical species through redox reactions. Microorganisms can utilize energy released by redox reactions for their metabolism following a thermodynamic sequence. Among these reactions, the dissimilatory reduction of sulfate (SO42−) to produce hydrogen sulfide (H2S) is one of the most important microbially-mediated pathways. The use of microelectrodes at the water-sediment interface provided a better understanding of sulfate reduction processes in the suboxic and anoxic zones. The goal of this study was to assess the microzonation of H2S and O2 under different conditions of light and oxygen in the water column. For this purpose, organic-rich lacustrine sediments from Pétrola Lake (SE Spain) were used. Sediment incubations were performed in mesocosm devices. The highest production of H2S (up to 0.36 nmol/cm-3s-1) was observed under anoxic and dark conditions. Production under those conditions was several orders of magnitude higher than those measured when oxygen was present in the water column. Furthermore, the absence of O2 in the water column significantly altered the microzonation of H2S in depth. The absence of light seems not to affect the dynamics of O2 and H2S in depth. The study contributes to our understanding of microzonation in organic-rich sediments.

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