Articles | Volume 19, issue 6
https://doi.org/10.5194/bg-19-1795-2022
https://doi.org/10.5194/bg-19-1795-2022
Research article
 | 
31 Mar 2022
Research article |  | 31 Mar 2022

Fossilization of Precambrian microfossils in the Volyn pegmatite, Ukraine

Gerhard Franz, Peter Lyckberg, Vladimir Khomenko, Vsevolod Chournousenko, Hans-Martin Schulz, Nicolaj Mahlstedt, Richard Wirth, Johannes Glodny, Ulrich Gernert, and Jörg Nissen

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Reply to Head's comment on “The Volyn biota (Ukraine) – indications of 1.5 Gyr old eukaryotes in 3D preservation, a spotlight on the `boring billion' ” by Franz et al. (2023)
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40Ar/39Ar dating of a hydrothermal pegmatitic buddingtonite–muscovite assemblage from Volyn, Ukraine
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Eur. J. Mineral., 34, 7–18, https://doi.org/10.5194/ejm-34-7-2022,https://doi.org/10.5194/ejm-34-7-2022, 2022
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Geochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites
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Cited articles

Alleon, J., Bernard, S., Le Guillou, C., Daval, D., Skouri-Panet, F., Pont, S., Delbes, L., and Robert, F.: Early entombment within silica minimizes the molecular degradation of microorganisms during advanced diagenesis, Chem. Geol., 437, 98–108, 2016. 
Altermann, W., Kazmierczak, J., Oren, A., and Wright, D. T.: Cyanobacterial calcification and its rock-building potential during 3.5 billion years of Earth history, Geobiology, 4, 147–166, 2006. 
Arp, G., Reimer, A., and Reitner, J.: Calcification in cyanobacterial biofilms of alkaline salt lakes, Eur. J. Phycol., 34, 393–403, 1999. 
Bartley, J. K.: Actualistic taphonomy of cyanobacteria: implications for the Precambrian fossil record, Palaios, 571–586, 1996. 
Burnham, A. K. and Sweeney, J. J.: A chemical kinetic model of vitrinite maturation and reflectance, Geochim. Cosmochim. Ac., 53, 2649–2657, 1989. 
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Short summary
In pegmatites from Ukraine Precambrian fossils between 1.5 Ga and 1.76 Ga were preserved in cavities connected to the surface in a geyser system. The fossilization process is silicification of the outermost rim of the fossils, stabilizing the remaining part of the organisms. The variety of organisms points to an ecosystem of several microorganisms which was active in the continental environment, and igneous rocks such as the pegmatites seem to be an ideal habitat for the deep biosphere.
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