English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/17076
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Mg-silica precipitation in fossilization mechanisms of sand tufa endolithic microbial community, Mono Lake (California)

AutorSouza-Egipsy, Virginia ; Wierzchos, Jacek ; Ascaso, Carmen ; Nealson, Kenneth H.
Palabras claveCyanobacteria
Silica precipitation
Biomineralización
Tufa
Fecha de publicación2005
EditorElsevier
CitaciónChemical Geology 217: 77-87 (2005)
ResumenThe detection of Mg–silica associated with endolithic biofilms of cyanobacteria and bacterial communities living in lake shore sand tufa formations in Mono Lake (California) has been observed using scanning electron microscopy with backscattered electron imaging (SEM–BSE) and energy-dispersive X-ray spectroscopy (EDS). Mg accumulated in cell walls of living cyanobacteria is interpreted to promote Mg-silicification with structural preservation while non-cyanobacterial prokaryotes are not fossilized. However, extracellular polymeric substances around the living communities were prominent as nucleation sites for authigenic mineral precipitation: a Mg–silicate served to stabilize the biofilm remains. Further diagenesis of these textures resulted in occlusion of the cytoplasm pore spaces by carbonate precipitates. This precipitate damaged the microfossil structures but the Mg–silica fabric was still present. The paleontological significance of Mg–silica precipitates as a possible biosignature of the former presence of endolithic biofilms is addressed.
Descripción11 pages, figures and tables statistics.
Versión del editorhttp://dx.doi.org/10.1016/j.chemgeo.2004.12.004
URIhttp://hdl.handle.net/10261/17076
DOI10.1016/j.chemgeo.2004.12.004
ISSN0009-2541
Aparece en las colecciones: (IRN) Artículos
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
Mostrar el registro completo
 

Artículos relacionados:


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