Carbonate Mineralogy Along a Biogeochemical Gradient in Recent Lacustrine Sediments of Gallocanta Lake (Spain)

Corzo, Alfonso; Luzón, Aránzazu; Mayayo, María José; Bergeijk, S.A. van; Mata, Pilar; García-de-Lomas, Juan

doi:10.1080/01490450500183654

Cited by 37 publications

(27 citation statements)

References 57 publications

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“…7), and the different d 18 O values with respect to carbonates from the source area, it has to be assumed that, in principle, the dolomites in this stage would be of primary origin. Moreover the textures observed are similar to those of the dolomites in Stage 3, that are now precipitating due to microbial mediation in the first few millimetres of the sediment (Corzo et al 2005). If this were the case, the homogeneity of the d 18 O values for the dolomite in Stage 2 might suggest that the oxygen isotopic composition of the lake water (d 18 O water ) did not undergo major changes with time.…”

Section: Brackish Stage Versus Saline Stagementioning

confidence: 64%

“…The sedimentological and chemical features of the recent lake are similar to most modern Ca-Mg-carbonates-bearing lacustrine environments: shallow playas with saline waters and high Mg/Ca ratios and sulphate content (McKenzie 1981;Gunatilaka 1987;Gunatilaka et al 1987;Last 1990;Vasconcelos and McKenzie 1997;Chafetz et al 1999;Wright 1999;van Lith et al 2002). In fact, various studies in the lake (Comín et al 1990;Queralt et al 1997;Rodó et al 2002;Mayayo et al 2003;Corzo et al 2005) reveal that different carbonates are currently forming, even though, due to the scarcity of works documenting the genesis of these minerals in recent environments, the authigenesis of the CaMg carbonates (dolomite and magnesite) is of special interest. Comín et al (1990), who used X-ray diffraction (XRD) analysis of particulate suspended matter sampled from the lake, deduced that calcite, dolomite and magnesite are currently precipitating in the water column, and work by Corzo et al (2005) supports the mechanism of interstitial Ca-Mg carbonates precipitation through bacterial mediation in the modern sediments of the Gallocanta lake.…”

Section: Introductionmentioning

confidence: 99%

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Stable isotope characterisation of co-existing carbonates from the Holocene Gallocanta lake (NE Spain): palaeolimnological implications

Luzón

Mayayo

Pérez

2008

Int J Earth Sci (Geol Rundsch)

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The sedimentary succession of Gallocanta lake, a closed saline lake located in the Iberian Range (NE Spain), documents two successive lacustrine stages: (1) brackish lake stage and (2) shallow saline lake stage. The saline stage corresponds to the present-day situation in which the lake water properties are mainly controlled by a strongly negative annual water balance. The carbonates of the brackish lake stage have relatively constant d 18 O values, however, they are rather high (d 18 O Do = 2.4% and d 18 O Cc = 4.5% mean values) suggesting a hydrologically closed lake with a long residence time of the waters. d 18 O values of carbonates from the saline stage vary greatly, and are lighter than in the previous stage (d 18 O Do = 0.5%, d 18 O Cc = -0.7%, d 18 O Mgs = -2.3% mean values).These carbonates also precipitated in a hydrologically closed lake, but in equilibrium with a lake water of more variable isotopic composition. The d 13 C values for carbonates of both stages reflect a mixing of different pools of carbon, but during saline stage d 13 C values have been more controlled by the equilibrium of the lake waters with atmospheric CO 2 . During the current stage, calcite and dolomite precipitate in Gallocanta lake mainly during spring and summer, although dolomite precipitation is more favoured towards the summer. Magnesite precipitates at the beginning of autumn, when the first rainfall re-dissolves the saline surface crust, producing saline waters with a high Mg 2+ content. The isotopic composition of lake waters sampled in 2005 are far higher than those calculated from the carbonates. It is considered that this could be due to two factors: either because there have not been many extremely dry years (like the year 2005) during the development of the lake, or because the physical and chemical characteristics of the lake waters in such conditions are not appropriate for the development of these minerals.

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Section: Brackish Stage Versus Saline Stagementioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Stable isotope characterisation of co-existing carbonates from the Holocene Gallocanta lake (NE Spain): palaeolimnological implications

Luzón

Mayayo

Pérez

2008

Int J Earth Sci (Geol Rundsch)

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“…Linear calibration was performed by considering the well oxygenated overlying water in the flow chamber to represent 100% saturation of O 2 and the anoxic layer inside the sediment to represent 0% saturation. Sulphide and pH microelectrodes had a tip diameter similar to that of the oxygen microelectrodes and were used and calibrated as reported elsewhere (Kühl et al 1998, Corzo et al 2005a. Total sulphide (H 2 S) was calculated from dissolved sulphide and pH (Kühl et al 1998).…”

Section: Methodsmentioning

confidence: 99%

Effects of green macroalgal blooms on intertidal sediments: net metabolism and carbon and nitrogen contents

Corzo

Bergeijk²,

García‐Robledo³

2009

Mar. Ecol. Prog. Ser.

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Eutrophication in coastal areas promotes blooms of green macroalgae that accumulate on the sediment, affecting the exchange of mass and energy at the sediment -water interface. The effects of macroalgal blooms on the microbenthic net metabolism and on the carbon and nitrogen contents of the sediment were studied during an in situ experiment. Two sediment enclosures (with and without macroalgae) of 1.5 × 1. ). This relatively low macroalgal biomass always suppressed the photosynthetic activity of microphytobenthos, decreased the oxygen availability for the sediment and reduced the oxygen penetration depth in the light and in the dark. The microbenthic community metabolism clearly shifted to heterotrophic, while the photoautotrophic activity was located in the macroalgal canopy. This macroalgal mat was net autotrophic, and more productive than the microphytobenthic community inhabiting the bare sediment. Part of the macroalgal production was buried in the sediment, increasing its carbon and nitrogen contents with respect to bare sediment during all seasons except spring. Concentrations of inorganic nutrients in the sediment were always higher below the macroalgal mat than in bare sediment, likely due to a direct input of inorganic nitrogen and phosphate associated with macroalgal debris.

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“…2). Los microelectrodos tenían un diámetro de punta de 20-30 µm y se calibraron y utilizaron tal y como se ha descrito en trabajos previos [25][26][27][28] . Para la calibración del electrodo de oxígeno se tomó como 0 de oxígeno agua residual estéril burbujeada con N 2 durante 5 min, mientras que el 100 % de saturación se tomó en agua residual estéril, previamente burbujeada con aire, durante otros 5 min.…”

Section: Microgradientes Físico-químicos En El Interior De La Biopelíunclassified

Efecto de la biopelícula en la corrosión de aceros inoxidables

et al. 2010

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ResumenEn este trabajo se ha estudiado la influencia de las biopelículas en los procesos de corrosión de diferentes aleaciones de acero inoxidable, situadas durante 4 años en dos puntos de una estación depuradora de aguas residuales. Se caracterizó el microambiente físico-químico en el interior de las biopelículas mediante microelectrodos de O 2 , H 2 S y pH, y se cuantificaron las tasas de corrosión a partir del número, diámetro y profundidad de picadura. Los resultados obtenidos muestran un desarrollo más notable de las biopelículas y un número de picaduras significativamente mayor en el canal de salida de desbastes que en el canal de recirculación de fangos. Con base en las características del agua sobrenadante y en las medidas realizadas con microelectrodos, se sugiere que la biopelícula induce la corrosión a través de tres posibles mecanismos: creación de celdas de aireación diferencial, zonas con diferente pH y zonas con elevada producción de sulfuro capaz de reaccionar con iones metálicos. Palabras claveBiopelículas; Biocorrosión; Acero inoxidable; Microelectrodos; Sulfuro. Effect of biofilm in the corrosion of austenitic stainless steels in wastewater treatment plants AbstractIn this work, the influence of the biofilms in the corrosion process of different alloys of stainless steel was studied in two sampling points in a wastewater treatment plant during 4 years. The physicochemical microenvironment within the biofilms was characterized through O 2 , H 2 S and pH microelectrodes. Corrosion rates were quantified from the number, diameter and depth of pits. The results show a remarkable development of the biofilm and a significantly greater number of pits in the grit removal channel than in the sludge recirculation channel. Based on the characteristics of the water phase and microelectrode measurements, our results suggest that biofilms induced corrosion throughout 3 mechanisms: creation of differential aeration cells, areas with different pH and areas having high sulphide production which may react with metal ions.

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Carbonate Mineralogy Along a Biogeochemical Gradient in Recent Lacustrine Sediments of Gallocanta Lake (Spain)

Cited by 37 publications

References 57 publications

Stable isotope characterisation of co-existing carbonates from the Holocene Gallocanta lake (NE Spain): palaeolimnological implications

Stable isotope characterisation of co-existing carbonates from the Holocene Gallocanta lake (NE Spain): palaeolimnological implications

Effects of green macroalgal blooms on intertidal sediments: net metabolism and carbon and nitrogen contents

Efecto de la biopelícula en la corrosión de aceros inoxidables

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