Exceptional preservation of fungi as H2-bearing fluid inclusions in an early quaternary paleohydrothermal system at Cape Vani, Milos, Greece

Magnus Ivarsson*, Stephanos P. Kilias, Curt Broman, Anna Neubeck, Henrik Drake, Ernest Chi Fru, Stefan Bengtson, Jonathan Naden, Kleopatra Detsi, Martin J. Whitehouse

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Abstrakt

The production of H2 in hydrothermal systems and subsurface settings is almost exclusively assumed a result of abiotic processes, particularly serpentinization of ultramafic rocks. The origin of H2 in environments not hosted in ultramafic rocks is, as a rule, unjustifiably linked to abiotic processes. Additionally, multiple microbiological processes among both prokaryotes and eukaryotes are known to involve H2-production, of which anaerobic fungi have been put forward as a potential source of H2 in subsurface environments, which is still unconfirmed. Here, we report fungal remains exceptionally preserved as fluid inclusions in hydrothermal quartz from feeder quartz-barite veins from the Cape Vani Fe-Ba-Mn ore on the Greek island of Milos. The inclusions possess filamentous or near-spheroidal morphologies interpreted as remains of fungal hyphae and spores, respectively. They were characterized by microthermometry, Raman spectroscopy, and staining of exposed inclusions with WGA-FITC under fluorescence microscopy. The spheroidal aqueous inclusions interpreted as fungal spores are unique by their coating of Mn-oxide birnessite, and gas phase H2. A biological origin of the H2 resulting from anaerobic fungal respiration is suggested. We propose that biologically produced H2 by micro-eukaryotes is an unrecognized source of H2 in hydrothermal systems that may support communities of H2-dependent prokaryotes.

OriginalsprogEngelsk
Artikelnummer749
TidsskriftMinerals
Vol/bind9
Udgave nummer12
Antal sider33
DOI
StatusUdgivet - dec. 2019

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Citationsformater

Ivarsson, M., Kilias, S. P., Broman, C., Neubeck, A., Drake, H., Fru, E. C., Bengtson, S., Naden, J., Detsi, K., & Whitehouse, M. J. (2019). Exceptional preservation of fungi as H2-bearing fluid inclusions in an early quaternary paleohydrothermal system at Cape Vani, Milos, Greece. Minerals, 9(12), [749]. https://doi.org/10.3390/min9120749