Browsing by Subject "CALCITE"
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Browsing by Subject "CALCITE"
Now showing items 1-20 of 37
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(1998)Dissolution rates of single calcite crystals, limestones, and compressed calcite powders were determined from sample weight loss using free-drift rotating disk techniques. Experiments were performed in aqueous HCl solutions ...
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(2003)An empirical model for investigating the behaviour of CaCO3 polymorphs incorporating a shell model for oxygen has been created. The model was constructed by fitting to: the structure of aragonite and calcite; their elastic, ...
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(2006)Sedimentary basins can contain close to 20% by volume of pore fluids commonly classified as brines. These fluids can become undersaturated with respect to calcite as a result of migration, dispersive mixing, or anthropogenic ...
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(1999)Although calcite is a common vein-filling mineral in rocks, there has been little understanding of the kinetics of vein-filling that gives a quantitative estimation of the fluid volume and time needed for calcite vein ...
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(2006)Mg-calcite was precipitated at 25 °C in closed system, free-drift experiments, from solutions containing NaHCO3, CaCl2 and MgCl2. The carbon stable isotope composition of bulk solid and solution were analyzed from subsamples ...
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(2004)Biomineralisation can only be understood as an interplay between organic and mineral phases. With this objective, we conducted an investigation of coccoliths using atomic force microscopy (AFM), an ultra-high resolution ...
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(2002)A novel flow-through method for cleaning and dissolving foraminiferal shells is presented. Using automated chromatographic equipment, the system chemically removes contaminant phases from the shells. The cleaned calcite ...
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(2001)Six carbonate samples of different origin were investigated for their properties: composition, grain size (Mz), specific surface area (SSA) and electrokinetic (ζ) potential. Four of the samples were of natural origin-one ...
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(2002)Equilibrium constants for modeling surface precipitation of divalent metals, M2+, onto hydrous ferric oxide and calcite were estimated from linear correlations of standard state Gibbs free energy of formation, ΔGf°, of the ...
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(1997)Re-examination of an experimental determination of the dissolution rate of reagent-grade calcite in seawater shows that the original conclusion of a rate law with 4.5-order dependence on undersaturation was very sensitive ...
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(2002)Stable isotopic compositions of bivalve shells have often been used for the reconstruction of high-resolution records of palaeotemperature and palaeoproductivity cycles. A major assumption in such studies is that isotopic ...
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(2001)Natural deformation in carbonate mylonites bearing sheet silicates occurs via a complex interaction of granular flow and solution transfer processes and involves continuous cycles of dissolution, grain boundary diffusion, ...
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(2001)The impact of carbo-gazeous saline spring waters, rich in Ca, Fe, As and P and chemically stable through time, on the chemistry (major and trace elements) and mineralogy of soils developed from anatexite is presented. The ...
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INHIBITION OF CALCITE PRECIPITATION BY ORTHOPHOSPHATE: SPECIATION AND THERMODYNAMIC CONSIDERATIONS (2006)The inhibition of heterogeneous calcite precipitation by orthophosphate was investigated under four different solution compositions using a pH-stat system. The system composition was designed to maintain a constant degree ...
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(2003)Intragranular microshear zones within a greenschist facies calcite marble were studied to try to constrain better the processes of dynamic recrystallization as well as the deformation processes that occur within newly ...
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(2006)We present evidence of inhibition of calcite dissolution by dissolved magnesium through direct observations of the (104) surface using atomic force microscopy (AFM) and vertical scanning interferometry (VSI). Far from ...
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(2002)In situ atomic force microscopy (AFM) experiments, scanning electron microscopy (SEM) imaging and composition analysis, and X-ray diffraction have provided information about the growth, dissolution and transformation ...
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(2002)The carbonate biominerals formed in the oogonial cells and on stems of charophytes reveal intra-specific and species-to-species variations within the genus Chara. Calcite, high-magnesian calcite (HMC) and aragonite may be ...
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(2001)Pore-water profiles of CO2, pH, Ca2+ and O2 in situ concentrations were measured at two stations on the upper continental slope off Gabon. The present study evaluates these measurements concerning their implications for ...
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(2006)Cation binding by polysaccharides is observed in many environments and is important for predictive environmental modeling, and numerous industrial and food technology applications. The complexities of these cation-organic ...
Now showing items 1-20 of 37