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Browsing ELibrary by Title
Now showing items 3215-3234 of 22187
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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 ...
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(1998)The Fe, Mg, and vacancy distributions in oxidized olivine of intermediate composition and the crystal structures of associated planar defects were examined by a combination of atomic-resolution transmission electron ...
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(2001)A variety of geological, petrological, and geochemical techniques were used in examining the internal structure of the Kivakka layered intrusion, whose thickness attains 2000 m. The following zones were distinguished in ...
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(2004)The distribution of Fe-Ni-Cu sulfide mineral in the section of the layered complex and their characteristics were discussed. The intercalation of low- and high-sulfur sulfide assemblages in the rocks of the Aganozerskiǐ ...
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(2002)The Mossbauer spectra of one chromite at 298 K and one chromite at 298, 200, 170, 140 and 90 K have been analyzed in this study. A Voigt-based quadrupole splitting distribution (QSD) method was used to analyze the spectra. ...
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(1996)The distribution of ferric iron among the phases of upper-mantle rocks, as a function of pressure (P), temperature (T) and bulk composition, has been studied using 57Fe Mössbauer spectroscopy to determine the Fe3+/ΣFe ...
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(1990)We have attempted to study the greenschist rocks of the ZGSFZ in the Tagobikul-Uch Kado-Kumarkh, Sardai Miena-Yagnob-Unzud, Barzangi-Zakhob, Barzangi-Kanyaz, and Dashtikhirson river basins. Au and Ag were determined using ...
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(2000)The distribution of isotopic water molecules, H2O, HDO, and D2O, in vapor and liquid phases in pure water and aqueous solution systems is related to the D/H fractionation factor between liquid and vapor phases, αL-V, and ...
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(1989)The authors analyzed statistically the distribution of zones of low and high elasticity in the earth's mantle, using as inputs the charts of velocity vS of transverse (S) waves at depths of 50, 150, 350, 550, 570, 1000, ...
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(1995)The concentrations of Ni, Cu, Zn, Ga, Ge, and Se in five, fine-grained chondrule rims in the highly unequilibrated CO3 chondrite ALH A77307 (3.0) have been determined for the first time by synchrotron X-ray fluorescence ...
Now showing items 3215-3234 of 22187