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Now showing items 13942-13961 of 41800
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(2003)Geochemical speciation and reaction path modelling with the Geochemists Workbench (GWB) software was used to investigate zonal As sulphide mineral precipitation and As transport in an active geothermal field, the Uzon ...
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(2002)The transformation from smectite to chlorite has been interpreted as involving either a disequilibrium chlorite/smectite mixed-layering sequence, or an equilibrated discontinuous sequence involving smectite-corrensite-chlorite. ...
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(2000)The formation pathways of pyrite are controversial. Time resolved experiments show that in reduced sulphur solutions at low temperature, the iron monosulphide mackinawite is stable for up to 4 months. Below 100°C, the rate ...
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(2002)The oxidation rate of natural orpiment from Carlin-type deposits was measured at 25 to 40°C in a mixed flow reactor as a function of pH (6.8 to 8.2) and dissolved oxygen concentration (6.4 to 17.4 ppm) with a starting ionic ...
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(2003)This paper presents and validates a new paradigm for modeling complex biogeochemical systems using a diagonalized reaction-based approach. The bioreduction kinetics of hematite (α-Fe2O3) by the dissimilatory metal-reducing ...
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(2000)Permeability was measured during decarbonation reaction of calcite + quartz → wollastonite + CO2 in the presence of water. The aggregate used for measurement was initially composed of 90 wt % calcite and 10 wt% quartz. At ...
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(2003)Fluid mobilization during prograde metamorphic reactions is a poorly understood, yet crucial, phenomenon that has implications for a number of geologic problems. Here we present the first experiments to characterize ...
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(2003)The reaction kinetics and fluid expulsion during the decarbonation reaction of calcite+quartz=wollastonite+CO2 in water-absent conditions were experimentally investigated using a Paterson-type gas apparatus. Starting ...
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(2001)Significant loss of coking ability resulted from the aerial oxidation of a coking coal for 49 days at 60<space>°C and 32 days at 80<space>°C. No detectable change in the distribution of the extractable aliphatic hydrocarbons ...
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(1996)This study evaluates the processes that form smythite, a mineral associated normally either with siderite in sedimentary iron formations and hydrothermal carbonate veins, or with pyrrhotite in nickel sulfide ore deposits. ...
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(1998)The reactivity of aqueous Au (super 1+) sulfides with FeS 2 at pH = 3 and 6 for temperatures of 25 and 90 degrees C has been investigated using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy with ...
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(2006)Reactions involving feldspars are of great importance in the environment, influencing geochemical cycles in many ways. Dissolution of feldspars has been widely studied in the laboratory, with attempts being made to reproduce ...
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(1998)The process of reactive dispersion is introduced whereby reaction in one chemical system imparts hydrodynamic dispersion to another apparently unrelated reactive transport system. Reactive dispersion is illustrated with a ...
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(2001)The distribution of reactive iron in sediments of the northwestern shelf, the shelf edge and the abyssal part of the Black Sea has been studied. In the euxinic Black Sea, iron sulfides (pyrite and iron monosulfide) are ...
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(2006)The availability of particulate Fe(III) to iron reducing microbial communities in sediments and soils is generally inferred indirectly by performing chemical extractions. In this study, the bioavailability of mineral-bound ...
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(2001)There is a large body of evidence which indicates that the concentration of many aqueous components in shallow crustal waters is controlled at least in part by mineral-buffering, even at relatively low temperatures. ...
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(1998)We investigated the adsorption of uranium(VI) at atmospheric CO2 partial pressure in a bicarbonate background ionic medium (pH 9.0+/-0.2). Goethite-coated sand was used as mine tailings model material. Both static, i.e., ...
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(1996)Reaction of iodide [I-(aq)] with a series of volcanic-ash soils was compared with reaction onto noncrystalline materials that constitute much of the inorganic fraction of these soils. Our hypothesis is that these ...
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(2001)Monocyclic aromatic compounds (MAC) represent a significant fraction of the total organic carbon in many geologic environments such as hydrothermal systems and petroleum reservoirs, yet the factors that control their ...
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(2004)Reduction rates in aquifers are commonly carbon limited, but little is known about the molecular composition and degradability of sedimentary organic matter (SOM) in aquifer sediments. The composition, source and degradation ...
Now showing items 13942-13961 of 41800