Earth Science Frontiers ›› 2023, Vol. 30 ›› Issue (2): 479-494.DOI: 10.13745/j.esf.sf.2022.2.82

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Research progress in microbial-mediated sulfur cycles in geothermal habitats: Insights into biological processes on the early Earth

MA Li1(), XIE Yihao2, WU Geng2, JIANG Hongchen1,*()   

  1. 1. School of Ocean Science, China University of Geosciences (Beijing), Beijing 100083, China
    2. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan 430074, China
  • Received:2022-01-05 Revised:2022-06-09 Online:2023-03-25 Published:2023-01-05
  • Contact: JIANG Hongchen

Abstract:

Geothermal habitats are characterized by high temperature and hypoxia similar to the conditions of early Earth. Therefore, thermophiles in modern geothermal habitats can be used to study the co-evolution of life and environment on the early Earth. The sulfur cycle is one of main biogeochemical processes on the early Earth, thus studying microbial-mediated sulfur cycle and its coupling with other elements in geothermal habitats can deepen our understanding of the biogeochemical sulfur cycle and its environmental effects on the early Earth. This review summarizes the characteristics of microbial diversity in the sulfur cycle and their influencing factors in geothermal habitats, as well as the coupling of the sulfur cycle with the iron, methane, and nitrogen cycles. Combined with Archean geochemical conditions and stratigraphic isotope record, this review also discusses the possible environmental effects of the sulfur cycle on the early Earth. Finally, an outlook on future research on microbial-mediated co-evolution of the sulfur cycle and environment on the early Earth is discussed.

Key words: geothermal habitats, sulfur cycle, Archean, microbes, environmental effect

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