Publications by authors named "M Homann"
Article Synopsis
- This study examines 3.48 billion-year-old pyritic stromatolites from the Dresser Formation, revealing distinct structures influenced by hydrothermal activity and microbial processes.
- The findings indicate a complex interplay between microbial life and sediment deposition, with evidence of organomineralization that suggests the presence of ancient microbial communities.
- The research implies diverse growth environments for these stromatolites, from shallow waters to brine pools, influenced by both phototrophic and chemotrophic organisms, as indicated by stable isotope data and metal accumulations.
We report abundant small calcareous mounds associated with fossilized kerogenous microbial mats in tidal-facies sandstones of the predominantly siliciclastic Moodies Group ( 3.22 Ga) of the Barberton Greenstone Belt (BGB), South Africa and Eswatini. Most of the bulbous, internally microlaminated mounds are several centimeters in diameter and formed at the sediment-water interface contemporaneously with sedimentation.
View Article and Find Full Text PDFIn silica-rich hot spring environments, internally laminated, digitate sinter deposits are often interpreted as bio-mediated structures. The organic components of microbial communities (cell surfaces, sheaths and extracellular polymeric substances) can act as templates for silica precipitation, therefore influencing digitate sinter morphogenesis. In addition to biologic surface-templating effects, various microenvironmental factors (hydrodynamics, local pH and fluctuating wind patterns) can also influence silica precipitation, and therefore the morphology of resulting digitate sinters.
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