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Microbially mediated carbonate concretion formation by different microbial pathways: (A) Ureolytic pathway; (B) Photosynthetic pathway; (C) Sulfate reduction pathway; (D) Methane oxidation pathway; (E) Carbonate precipitation on microbial cell walls; and (F) Carbonate precipitation via microbial EPS (Created with BioRender.com).
