Person: Cabestrero Aranda, Óscar
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First Name
Óscar
Last Name
Cabestrero Aranda
Affiliation
Universidad Complutense de Madrid
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- PublicationMineralogénesis, procesos geobiológicos y evolución sedimentaria en lagunas salinas del centro peninsular (Cuenca del Duero y Guadiana)(Universidad Complutense de Madrid, 2019-06-25) Cabestrero Aranda, Óscar; Sanz-Montero, María EstherLa presente Tesis Doctoral se centra en el estudio de los procesos biosedimentarios que tienen lugar en dos complejos lagunares endorreicos del centro peninsular que presentan distinta naturaleza hidroquímica. El primero, situado en la provincia de Toledo (Lagunas de Lillo), comprende las lagunas de El Longar, Altillo Grande y Altillo Chica. El segundo grupo está integrado por las lagunas de Las Eras,Caballo Alba y Bodón Blanco, que están ubicadas entre las provincias de Segovia y Valladolid (Lagunas de Coca-Olmedo). A excepción de la laguna de El Longar, que es permanente, la presencia de agua en estas lagunas es limitada, secándose desde el final de la primavera hasta el final del verano. En todas ellas se desarrollan tapices microbianos formados por comunidades de microorganismos. Estos organismos, por sus actividades metabólicas, interaccionan con el medio modificando sus condiciones.Para llevar a cabo este estudio se han utilizado varias técnicas petrológicas, mineralógicas y microbiológicas...
- PublicationThe role of microbial extracellular polymeric substances on formation of sulfate minerals and fibrous Mg-clays(Elsevier, 2021-10-20) Buey, Pablo del; Sanz Montero, M. Esther; Braissant, Olivier; Cabestrero Aranda, Óscar; Visscher, Pieter T.A variety of Mg-, Na- and Ca-sulfates, including gypsum, and Mg-clays precipitate within the microbial mats that developed seasonally in the hypersaline playa lake El Longar (Central Spain). A multidisciplinary study of the microbial mats along a transect of the lake demonstrates that the degree of lithification of the mats increases from the soft and poorly lithified layers lying on the submerged ground to the highly crystalline mats present in the desiccated fringes. The community composition of the mats is diverse, dominated in terms of OTUs by Proteobacteria, Firmicutes and Cyanobacteria. The Proteobacteria include sulfur-cycling microbes, supporting biogeochemical cycling of this element. Cyanobacteria are the dominant EPS producers in microbial mats and Firmicutes and Proteobacteria have both been shown to play a role in EPS turnover. Several ions (e.g., Mg, S, Si, Al, Fe, Ca, Na) are bound to functional groups of EPS. The abundance of sulfate groups and carboxylic acids suggested that the EPS have a strong binding capacity for Mg2+ and Ca2+, which were higher in the submerged microbial mats. Na, Mg, K, Ca, SO4 2− and Si are more concentrated in the EPS matrices than in the natural brines. The concentration of ions in the EPS is sufficient to precipitate a mixture of minerals through freeze-drying, that is similar to that found in intact mats. In the EPS of the submerged mats precipitate more types of minerals, including sulfates and Mg-clays, than in the EPS of the exposed areas. These results suggest that the mineral nucleation occurred during the degradation of the mats when the EPS was progressively desiccated and likely released high amounts of ions. The present study helps to understand intrasedimentary growth of sulfates and clays in microbial mats. The presence of these mineral assemblage can be related to a potential biosignature of microbial past life on Earth and possibly also on exoplanets, like Mars.
- PublicationMg-rich carbonates mediated by a bacterium isolated from an extreme alkaline lake in Central Spain(Copernicus GmbH, 2018) Sanz Montero, M. Esther; Cabestrero Aranda, Óscar; Sánchez-Román, Mónica
- PublicationPrecipitación de sales en una laguna sulfatada magnésico-sódica (La Mancha,España): controles ambientales(Sociedad Española de Mineralogía, 2013) Cabestrero Aranda, Óscar; García del Cura, M. Ángeles; Sanz Montero, M. Esther