Informace o publikaci
Early Permian Freshwater Silicified Stromatolites and Oolites from the Krkonoše Piedmont Basin (Bohemian Massif): Paleobiology, Environmental Setting and Early Diagenesis
| Autoři | |
|---|---|
| Rok publikování | 2025 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | Bulletin of Geosciences |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | http://www.geology.cz/bulletin/contents/art1915 |
| Doi | https://doi.org/10.3140/bull.geosci.1915 |
| Klíčová slova | early Permian; Krkonoše Piedmont Basin; stromatolites; oolites; cyanobacteria; silicification |
| Popis | Late Palaeozoic non-marine microbialites remain poorly documented despite their potential significance for understanding terrestrial ecosystems during this period of profound climatic and environmental change. Here we report exceptionally preserved lower Permian (Autunian regional stage ~ Asselian-Sakmarian) silicified stromatolites and oolites from the Krkonoše Piedmont Basin (Bohemian Massif, Czech Republic). Despite their occurrence in Quaternary eluvial and colluvial deposits, multiple lines of evidence suggest formation in a shallow, ephemeral fluviolacustrine setting. The stromatolites display a vertical succession of different growth forms, including structures similar to modern sheath-forming cyanobacterial taxa that form fan-like and hemispheroidal colonies with characteristic upright growth, features especially common in modern streams and rivers. Early diagenetic silicification preserved not only delicate stromatolitic architectures but also microbial organic matter. The presence of volcaniclastic material within ooidal cortices and cores, as well as within the rock matrix, indicates contemporaneous volcanic input, which likely provided silica for early replacement of the primary carbonate fabric. This exceptional preservation, facilitated by rapid CaCO3 encrustations of microbial structures and subsequent early silicification, provides rare insights into early Permian terrestrial ecosystems. |
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