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Showing 1 to 20 of 58 for “"Carbonate minerals"”.
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Adsorption to and Dissolution of Carbonate Minerals
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The formation of carbonate minerals in laboratory and environmental settings
… processes driving the formation of sedimentary carbonate minerals. While some work has been done exploring the formation of carbonate minerals via microbial sulfate reduction, less attention has been given to the detailed processes involved in this microbially induced carbonate mineral formation …
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The origin and behaviour of carbonate minerals in diverse environments: from subduction zones to asteroids
Carbonate minerals are some of the most important carbon storage materials in both terrestrial and asteroidal settings. Understanding the origin and behaviour of carbonates as a function of pressure, temperature, and composition of coexisting phases is therefore crucial for modelling carbon fluxes. …
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The formation and origin of carbonate minerals in the Darling and Yzerfontein hypersaline pans, Western Cape, South Africa
… has an arid, Mediterranean type climate. The carbonate minerals calcite and dolomite have precipitated in the pans through the evaporation and concentration of ions derived from weathering of bedrock, marine aerosols and coastal rainfall. Five pans were studied, the brine-type pans Rooipan …
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Climate change and anthropogenic effects on shallow-water carbonate biogeochemistry
… state of surface ocean waters with respect to carbonate minerals will decline during the twenty-first century owing to increasing atmospheric CO2. As a result calcareous organisms could have difficulty calcifying, leading to production of weaker skeletons and their greater vulnerability to …
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Carbon and mineral transformations in seafloor serpentinization systems
… dissolved inorganic carbon can precipitate as carbonate minerals or undergo reduction by H2(aq) to form reduced carbon species. In Chapters 2 and 3, I conduct laboratory experiments to assess the relative extents of carbonate formation and CO2 reduction during alteration of peridotite by …
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Carbon and mineral transformations in seafloor serpentinization systems
… dissolved inorganic carbon can precipitate as carbonate minerals or undergo reduction by H2(aq) to form reduced carbon species. In Chapters 2 and 3, I conduct laboratory experiments to assess the relative extents of carbonate formation and CO2 reduction during alteration of peridotite by …
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Permanence and Life Cycle Performance of Biocementation Soil Improvement
… granular soils through the generation of calcium carbonate minerals on soil particles surfaces and at interparticle contacts. The process can offer an environmentally beneficial alternative to conventional ground improvement methods, which have traditionally relied on energy-intensive …
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Application of Foam for Mobility Control in Enhanced Oil Recovery (EOR) Process
… adsorption of cationic surfactants on natural minerals was discussed in a separate chapter, although it is one aspect for evaluating surfactant formulations. A numerical model was used to fit the foam strength for foam flooding at reservoir conditions. The solubility, thermal and chemical …
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Prediction of Mississippi-Valley type ore fluid metal concentrations from solid solution metal concentrations in ore-stage minerals
… solid solution concentrations in the ore-stage minerals calcite and galena. Using experimental partition coefficients from Rimstidt et al. (1998) at ore stage temperatures and measured compositions of ore-stage calcite from the Illinois-Kentucky and Central Tennessee MVT districts, …
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Evaluation of potential acid mine drainage: A case study of the Albert Silver Mine, Mpumalanga Province, South Africa
… mining produces mine wastes that contain sulfide minerals that have potential to produce acid mine drainage. Albert Silver Mine conducted mining of the silver-sulfide bearing ore from 1885 to 1914. However, at the time, little attention was being given to acid mine water generation. This study …
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Organic influences on hydrated magnesium carbonate mineral formation
Carbonate minerals retain organic compounds and preserve textural and chemical evidence of microbial activity early in the geologic record of Earth. For this reason, magnesium carbonates thought to be associated with lacustrine deposits in Jezero Crater are an important target of the Mars Sample …
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Silicate Mineral Dissolution and Associated Carbonate Precipitation at Conditions Relevant to Geologic Carbon Sequestration
… magnesium for subsequent precipitation of Mg-carbonate minerals. This study was conducted at conditions relative to GCS. Under different geological conditions, the thermodynamics and kinetics of both dissolution and precipitation reactions can vary. The overall fate of injected CO2 into porous …
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Carbon Dioxide Flooding Induced Geochemical Changes in a Saline Carbonate Aquifer
… which reacts with the host rock to dissolve carbonate minerals. Dissolution of carbonate minerals may compromise the integrity of the formation, leading to the eventual escape of CO2 to the surface. In order for CO2 sequestration to be effective, CO2 must remain below the surface …
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Microbial-Induced Calcite Precipitation in soils: use of alternative raw materials and analysis of environmental implications
… that induces the precipitation of calcium carbonate minerals as a result of microbial activity. In MICP via urea hydrolysis, urea, calcium, and simple carbon and nitrogen chemical compounds are supplied to stimulate degradation of urea by ureolytic microorganisms to produce carbonates and …
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An Examination of the Mineralogy and Lithology of the Bakken Shale with Implications upon the Bakken Petroleum System, Southeastern Saskatchewan
… comprising quartz, feldspar, mica and heavy minerals; b) detrital clay minerals with minor authigenic clays; c) a mixture of detrital and authigenic carbonate minerals (primarily dolomite and calcite); and d) other minerals of minor abundance (pyrite, sphalerite, anhydrite, and apatite). This …
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Isotopic composition of dissolved inorganic carbon in underground mine discharges of the northern appalachian basin
… sources of carbon could be discriminated, e.g. carbonate minerals, organic carbon from coal and shale, organic carbon from the soil zone, or biogenic methane. Parameters describing hydrogeologic setting resulted in distinct statistical clusters separating fully-flooded, partially-flooded, and …
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Rb-Sr Alter und Sr-Pb Isotopencharakteristik von Gangmineralisationen in paläozoischen Gesteinen am Nordrand des linksrheinischen Schiefergebirges (Raum Stolberg-Aachen-Kelmis) und Vergleich mit den rezenten Thermalwässern von Aachen-Burtscheid
… Carboniferous, Upper Devonian and Lower Devonian carbonate and siliciclastic sediments. Three core cuts display intensive hydrothermal veining with variable orientations. These veins are mm to cm wide and represent extension structures with characteristics of deformation and recrystallization in …
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Characterizing the effects of ocean acidification in larval and juvenile Manila clam, Ruditapes philippinarum, using a transcriptomic approach
… oceans. Increased pCO2 reduces the saturation of carbonate minerals required to form calcified structures. Being able to cope with the increased energetic demand of maintaining these structures, in addition to other vital physiological processes, will be the key driver that determines which …
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On the ability of rocks to conduct heat in the lithosphere
… and improving our understanding of the minerals that compose samples. Using a newly-developed plagioclase interpolation model, and new measurements for the D of common carbonate minerals, we compare measured to calculated D at ambient and elevated temperature (T). For most samples, D at …
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