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Título: | The role of microorganisms in the formation of calcitic moonmilk deposits and speleothems in Altamira Cave |
Autor: | Sánchez-Moral, Sergio CSIC ORCID ; Portillo Guisado, María del Carmen CSIC ORCID; Janices Alonso, Irene CSIC; Cuezva, Soledad CSIC ORCID; Fernández Cortés, A.; Cañaveras, Juan Carlos CSIC ORCID; González Grau, Juan Miguel CSIC ORCID | Palabras clave: | Moonmilk Cave Bacterial communities Bacterial activity pH Carbonate precipitation |
Fecha de publicación: | 2011 | Editor: | Elsevier | Citación: | Geomorphology | Resumen: | Bacteria are able to induce carbonate precipitation although the participation of microbial or chemical processes in speleothem formation remains a matter of debate. In this study, the origin of carbonate depositions such as moonmilk, an unconsolidated microcrystalline formation with high water content, and the consolidation of carbonate precipitates into hard speleothems were analyzed. The utilized methods included measurements of the composition of stable isotopes in these precipitates, fluorimetric determinations of RNA/DNA ratios and respirometric estimations in Altamira Cave. Results from isotope composition showed increases of the δ18O and δ13C ratios from moonmilk in the very first stages of formation towards large speleothems. Estimates of RNA/DNA ratios suggested an inactivation of microorganisms from incipient moonmilk towards consolidated deposits of calcium carbonate. Respiratory activity of microorganisms also showed a significant decrease in samples with accumulated calcite. These results suggest that bacterial activity induces the conditions required for calcium carbonate precipitation, initiating the first stages of deposition. Progressive accumulation of carbonate leads towards a less favorable environment for the development of bacteria. On consolidated speleothems, the importance of bacteria in carbonate deposition decreases and chemical processes gain importance in the deposition of carbonates. | Descripción: | 52 referencias. En prensa. All Altamira Cave Research Centre and Museum staff is acknowledged for their collaboration throughout the whole research period. | Versión del editor: | doi:10.1016/j.geomorph.2011.10.030 | URI: | http://hdl.handle.net/10261/42244 | ISSN: | 0169-555X |
Aparece en las colecciones: | (IRNAS) Artículos |
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