Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/42244
COMPARTIR / EXPORTAR:
logo share SHARE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE

Invitar a revisión por pares abierta
Título

The role of microorganisms in the formation of calcitic moonmilk deposits and speleothems in Altamira Cave

AutorSánchez-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 claveMoonmilk
Cave
Bacterial communities
Bacterial activity
pH
Carbonate precipitation
Fecha de publicación2011
EditorElsevier
CitaciónGeomorphology
ResumenBacteria 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.
Descripción52 referencias. En prensa. All Altamira Cave Research Centre and Museum staff is acknowledged for their collaboration throughout the whole research period.
Versión del editordoi:10.1016/j.geomorph.2011.10.030
URIhttp://hdl.handle.net/10261/42244
ISSN0169-555X
Aparece en las colecciones: (IRNAS) Artículos




Ficheros en este ítem:
Fichero Descripción Tamaño Formato
The role of microorganisms in the formation.pdf457,67 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo

CORE Recommender

Page view(s)

430
checked on 27-mar-2024

Download(s)

344
checked on 27-mar-2024

Google ScholarTM

Check


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.