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Browsing ELibrary by Title
Now showing items 3139-3158 of 21768
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DISSOLUTION OF STRONTIANITE AT HIGH P-T CONDITIONS: AN IN-SITU SYNCHROTRON X-RAY FLUORESCENCE STUDY (2003)In-situ measurements of the amount of dissolution of carbonate minerals at high pressures (up to 3.6 GPa) and temperatures (up to 523 K) are reported. Using an externally heated diamond anvil cell (DAC) and synchrotron ...
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(2001)Previous research by our group (e.g., [Chem. Geol. 132 (1996) 25; Geochim. Cosmochim. Acta 64 (2000) 1363]) has shown that an aerobic Pseudomonas mendocina bacterium enhances Fe(hydr)oxide dissolution in order to obtain ...
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(1999)Experiments describing the extent of dissolution of β-MnOOH(s) suspensions vs. time using measurements of both total dissolved Mn and Mn(III) complex species show that the ligands pyrophosphate (P2O74-), ethyelenediamine ...
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(1998)In the system Di–Ab–An–H2O, melt inclusions in plagioclase were reproducibly formed in a series of partial dissolution experiments, and the compositional differences from the surrounding matrix melt were evaluated. At 200 ...
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(1996)Scanning Force Microscopy (SFM) was used to develop a method which can provide quantitative kinetic data of crystal growth and dissolution. Based on observations of single crystal faces in monolayer resolution, morphology ...
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(1998)This paper reports on our use of scanning force microscopy (SFM) to study calcite dissolution rates. Until now, calculation of rates has been limited to surfaces on which steps retreat at an isotropic velocity. More commonly, ...
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(2002)Experimentally observed dissolution rates of minerals in an aqueous solution are determined by surface reaction rates, mass transport by molecular diffusion through a diffusion boundary layer (DBL) and the morphology of ...
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(2004)To help constrain models involving the chemical stability and lifetime of gas clathrate hydrates exposed at the seafloor, dissolution rates of pure methane and carbon-dioxide hydrates were measured directly on the seafloor ...
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(1986)The dissolution rates of the major upper mantle minerals olivine, orthopyroxene, clinopyroxene, spinel, and garnet have been determined in an alkali basalt melt at superliquidus temperatures and 5, 12, and 30 kb. At low ...
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(1996)Fe(III) and Fe(II) organic complexes were determined by spectroscopic methods after sephadex gel fractionation of salt marsh porewaters during June and July 1993. Fe(III), which is a significant anaerobic oxidant for sulfide ...
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(1999)New experimental amphibole/melt partition coefficients from a variety of geologically relevant amphibole (pargasite, kaersutite, and K-richterite) and melt compositions obtained under conditions of interest to upper-mantle ...
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(2002)The paper reports the results of detailed studies (in 1990-1999) of the fumarolic activity at Kudryavyi volcano. The highest temperature of the fumarolic gages of 940degreesC was registered in 1992, after which the gas ...
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(2002)The genesis of K-rich basites is discussed on the basis of the authors' materials on high-K basalts from the northern Siberian Platform and data compiled from the literature on other areas worldwide. The petrology, ...
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(2004)Elevated gamma-ray emission from discrete beds in sedimentary deposits may conventionally be interpreted as representing flooding surfaces or transgressive beds. Potassium (K), uranium (U), or (less commonly) thorium (Th) ...
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(2005)The infrared absorption spectrum of amethyst in the region of stretching vibrations of X–OH groups reveals several bands that have been used for the separation of natural from synthetic amethyst. The intensity and shape ...
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DISTINGUISHING SHOCKED FROM TECTONICALLY DEFORMED QUARTZ BY THE USE OF THE SEM AND CHEMICAL ETCHING (1996)Multiple sets of crystallographically-oriented planar deformation features (PDFs) are generated by high-strain-rate shock waves at pressures of >12 GPa in naturally shocked quartz samples. On surfaces, PDFs appear as narrow ...
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(2004)Strontium isotope ratios (87Sr/86Sr) of soil solids, soil cation extracts, irrigation water and plant material are used to determine strontium and therefore cation sources and fluxes in irrigated and natural soil-plant ...
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(1993)In this paper we discuss the distribution, geochemical cycle, and evolution of CO2 and N2 in Earth's degassed mantle, atmosphere, and continental crust. We estimate the present distribution of CO2 and N2 in Earth's degassed ...
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(1989)Igneous rocks are currently classified into specific types associated by a common mode of evolution and similar composition. An important aspect of this approach is the identification of groups of igneous rocks with similar ...
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(1999)Biotite and albite grains having a size range from 20 to 124 μm were suspended in Be-bearing solutions at pH 2 to 9 for periods of 30 min to 20 days. The amount of Be sorbed onto biotite is up to 40 times higher than onto ...
Now showing items 3139-3158 of 21768