Abstract
Mounting geochemical evidence suggests microorganisms capable of oxygenic photosynthesis (e.g., Cyanobacteria) colonized Archean continental surfaces, driving oxidative weathering of detrital pyrites prior to the 2.5 Ga Great Oxidation Event (e.g., Stueken et al., 2012; Reinhard et al., 2013; Lalonde and Konhauser, 2015; Havig et al., 2017a). Modern terrestrial environments dominated by biofilms comprised of phototrophs include hydrothermal systems (e.g., Yellowstone National Park) and hypolithic communities found in arid to hyper-arid deserts (e.g., McMurdo Dry Valleys of Antarctica, Atacama Desert of Chile). Here, we explore phototrophic communities in both hypolithic and hot spring environments in Yellowstone National Park as potential analogs to Archean continental surfaces. Hypolithic communities in geothermal settings were similar in both composition and carbon uptake rates to proximal hot spring communities. It is our opinion that hydrothermal area hypolithic communities represent modern analogs of communities that colonized Archean continental surfaces, producing oxygen locally and facilitating microbially-mediated pyrite oxidation prior to the presence of free oxygen in the global atmosphere.
Highlights
Reviewed by: Stefan Lalonde, Université de Bretagne Occidentale, France Alexandra V
While scanning the surface of a continent rising above the global ocean (Taylor and McLennan, 1995; Collerson and Kamber, 1999), the team observes active hydrothermal areas drained by rivers of bright orange waters, similar to those impacted by acid mine drainage on Earth
Photosynthetic microbial communities were sampled from three hydrothermal areas, including the Norris Geyser Basin, the Gibbon Geyser Basin, and the Lower Geyser Basin in Yellowstone National Park, WY, USA (Supplementary Figure 2)
Summary
Reviewed by: Stefan Lalonde, Université de Bretagne Occidentale, France Alexandra V. Mounting geochemical evidence suggests microorganisms capable of oxygenic photosynthesis (e.g., Cyanobacteria) colonized Archean continental surfaces, driving oxidative weathering of detrital pyrites prior to the 2.5 Ga Great Oxidation Event (e.g., Stüeken et al, 2012; Reinhard et al, 2013; Lalonde and Konhauser, 2015; Havig et al, 2017a).
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