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Now showing items 12177-12196 of 39126
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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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(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 ...
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(1996)The usefulness of biomarker compounds buried in marine sediments depends upon a quantitative understanding of the effects of early diagenesis on their distribution. To address this, a new experimental approach was utilized ...
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(2001)The observation that inclusion trails in porphyroblasts commonly exhibit a more or less constant orientation over a large area, even though the enclosing rocks have been folded, has been considered puzzling by geologists ...
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(2003)Spinels (Mg,Fe2+)(Cr,Al,Fe3+)2O4 are the most informative minerals for reconstruction of PT crystallization parameters and differentiation conditions of ultramafic melts [1]. It is known that the real structure and physical ...
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(2001)Results of investigations of hydrocarbon gas/liquid mixtures as experiments in the P-V-T bomb and observed in real wells are presented. The different hierarchical levels of the gas/liquid systems, which are similar, ...
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(IOP Publishing, 2015)Unique data of the mineralogical and petrochemical zoning of near- veined metasomatic aureole of mesothermal Zun-Holba gold deposit are presented and discussed. It was established that mineralogical and petrochemical zoning ...
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(2003)Peat samples subjected to thermal oxidation were studied by solid-state 13C- and 15N-NMR spectroscopy, so as to gain information on the thermal alteration of organic matter during processes such as natural fires or prescribed ...
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(2004)Interpretation of new ice core data and reappraisal of existing data, both from the basal part of the Vostok ice core, give strong support to a kind of thermohaline circulation in Lake Vostok. Although the salinity of the ...
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(1995)This is Part 1 of a two-part study on the garnet(Grt)-clinopyroxene(Cpx) Fe−Mg exchange equilibrium widely used in geothermometry of amphibolites, granulites and eclogites. The experimental data set previously published ...
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(1995)The garnet (Grt)-clinopyroxene (Cpx) Fe−Mg exchange thermometer has been re-evaluated through analysis of phase equilibrium experiments defining the Fe−Mg exchange between Grt and Cpx, Grt and Ol (Ol=Olivine), and Cpx and ...
Now showing items 12177-12196 of 39126