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Biogenic Mn-Oxides in Subseafloor Basalts.

Magnus Ivarsson1, Curt Broman2, Håkan Gustafsson3

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Fossilized fungi found in deep subseafloor basalts are linked to manganese oxide formation. This discovery highlights fungi

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Area of Science:

  • Deep biosphere research
  • Marine geology
  • Microbial ecology

Background:

  • The deep subseafloor biosphere, particularly within basalts, is a significant frontier in Earth and biological sciences.
  • Recent findings indicate the presence of fungi in these environments, challenging previous notions of microbial diversity and ecological roles.

Purpose of the Study:

  • To describe fossilized fungal communities associated with manganese oxides in subseafloor basalts.
  • To investigate the role of fungi in manganese cycling in deep-sea environments.
  • To evaluate Electron Paramagnetic Resonance (EPR) spectroscopy as a method for identifying biogenic manganese oxides.

Main Methods:

  • Analysis of fossilized fungal communities in vugs within subseafloor basalts.
  • Mineralogical and morphological characterization of associated botryoidal manganese oxides (todorokite).
  • Electron Paramagnetic Resonance (EPR) spectroscopy analysis of manganese oxides.

Main Results:

  • Fossilized fungal communities were identified in subseafloor basalts at 936.65 meters below seafloor.
  • These fungal communities were closely associated with botryoidal todorokite manganese oxides.
  • EPR analysis provided evidence suggesting a biogenic origin for the manganese oxides.

Conclusions:

  • Fungi play a role in manganese cycling within the deep subseafloor biosphere.
  • The study provides evidence for the biological origin of manganese oxides associated with deep-sea fungi.
  • EPR spectroscopy is presented as an effective tool for identifying biogenic manganese oxides in such environments.