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| Gong, Jian; Myers, Kimberly D.; Munoz-saez, Carolina; Homann, Martin; Rouillard, Joti; Wirth, Richard; Schreiber, Anja; Van Zuilen, Mark A.. |
| Palisade fabric is a ubiquitous texture of silica sinter found in low temperature (<40 degrees C) regimes of hot spring environments, and it is formed when populations of filamentous microorganisms act as templates for silica polymerization. Although it is known that postdepositional processes such as biological degradation and dewatering can strongly affect preservation of these fabrics, the impact of extreme aridity has so far not been studied in detail. Here, we report a detailed analysis of recently silicified palisade fabrics from a geyser in El Tatio, Chile, tracing the progressive degradation of microorganisms within the silica matrix. This is complemented by heating experiments of natural sinter samples to assess the role of diagenesis. Sheathed... |
| Tipo: Text |
Palavras-chave: Silica sinter; Biosignature; El Tatio; Sheathed cyanobacteria; Experimental diagenesis; Mars. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00637/74902/76135.pdf |
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