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Browsing ELibrary by Title
Now showing items 13997-14016 of 21936
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(1998)Reductive dissolution of synthetic birnessite (MnO1.7(OH)0.25 or MnO1.95) by arsenious acid (H3AsO3) proceeds in two steps. The first entails reduction of Mn(IV) to Mn(III), with stoichiometry: 2MnO2+H3AsO3=2MnOOH*+H3AsO4H3AsO3 ...
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(2000)The present study is an investigation into the surface reactions of synthetic birnessite [Mn(II)0.05Mn(III)0.25Mn(IV)0.7O1.7(OH)0.25] when reacted with dilute (5 × 10−4 M) Na-humate solution using X-ray Photoelectron ...
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(1999)Reductive dissolution of synthetic 7#9-birnessite [MnO1.7(OH)0.25 or MnO1.95] by Na-oxalate produces a Mn(III) intermediate reaction product (here represented as MnOOH*) which subsequently reacts with sorbed (COO)2-2 to ...
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(1997)The standard form of the Scherrer equation, which has been used to calculate the mean thickness of the coherent scattering domain (CSD) of illite crystals from X-ray diffraction (XRD) full width data at half maximum (FWHM) ...
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(1998)A modified version of the Bertaut-Warren-Averbach (BWA) technique (Bertaut 1949, 1950; Warren and Averbach 1950) has been developed to measure coherent scattering domain (CSD) sizes and strains in minerals by analysis of ...
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(2002)Carbonate rocks frequently contain some silicate minerals and various xenoliths. Calcareous mudstone is also widely distributed. There is no report of practical analytical method of mixtures of silicate and carbonate by ...
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(2004)There are two types of sparry magnesite deposits in the Southern Urals province: 1 ) layer-like bodies in the stratigraphic dolostone horizons; 2) lens-like bodies in the dolomitized limestones. The sparry magnesite deposits ...
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(1989)A single crystal X-ray investigation of yafsoanite resulted ina = 12.632(2) , space groupIa3d, cell content 8 Ca3Te2Zn3O12 (with some Pb for Ca),R = 0.075,wR = 0.028 for 186 independent reflections. Contrary to the results ...
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(2002)The Siberian craton has been tectonically regionalized. Comparison of isotopic ages shows that this craton formed in the late Paleoproterozoic (2.0-1.8 Ga) after Archean microcontinents had collided and amalgamated. The ...
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YAMATO 86029: AQUEOUSLY ALTERED AND THERMALLY METAMORPHOSED CI-LIKE CHONDRITE WITH UNUSUAL TEXTURES (2003)We describe the petrologic and trace element characteristics of the Yamato 86029 (Y-86029) meteorite. Y-86029 is a breccia consisting of a variety of clasts, and abundant secondary minerals including coarse- and fine-grained ...
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(2003)Many techniques have been developed to calculate the elastodynamic response of a stack of plane layers to a plane, spectral wave. These variations on the original propagator matrix method, commonly called the Haskell matrix ...
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(2002)The failure behavior of rocks can be quite complex, affected by such factors as stress path, anisotropy, and loading types and conditions. To understand the mechanical behavior of rocks under complex field conditions, the ...
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(1988)In the Udachnaya kimberlite pipe in the Daldyn field, Yakutia, the authors discovered and studied in our Institute the new carbonate Na2Ca(CO3)2, called zemkorite and close in composition to the known carbonate nyerereite, ...
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(2001)Over the past 40 years, two universally accepted maxims of geology dealing with zeolite minerals have been shown to be incorrect: the first is that zeolites occur primarily as cavity fillings in basaltic igneous rocks, and ...
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(2000)A group of low-temperature peridotites with equigranular mosaic texture is distinguished among spinel peridotite xenoliths from Pliocene basanites of the Dzhilinda River. The mineral compositions of these peridotites are ...
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(2005)The mobility and solid-state speciation of zinc in a pseudogley soil (pH = 8.2–8.3) before and after contamination by land-disposition of a dredged sediment ([Zn] = 6600 mg kg−1) affected by smelter operations were studied ...
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(2004)The ‘Snowball Earth’ model of Hoffman et al. [Science 281 (1998) 1342] has stimulated renewed interest in the causes of glaciation in Earth history and the sedimentary, stratigraphic and geochemical response. The model ...
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(2004)(U-Th)/He chronometry of zircon has a wide range of potential applications including thermochronometry, provided the temperature sensitivity (e.g., closure temperature) of the system be accurately constrained. We have ...
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(2004)The Aleksandrov Complex (AC) of metamorphic rocks is restricted to the long-lived Zyuratkul Fault on the western slope of the southem Urals, 2-3 km east of the known Taratash Complex. It makes up a NNE-trending tectonic ...
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(2003)Investigations of zircon geochronology of the Salda metamorphic complex are continued in case of metamorphic rocks in eastern slope of Middle Urals. Results of the investigations make it possible to compare analytic and ...
Now showing items 13997-14016 of 21936