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Browsing ELibrary by Title
Now showing items 3194-3213 of 21936
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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 ...
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(1998)In the Pleistocene-Holocene section of the Baikal deep-water sediments shales are periodically enriched with the siliceous shells of diatomic algae up to nearly pure diatomite. As the terrigenous shale-silty material is ...
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(2000)Solution 31P NMR spectroscopy has been used for the characterization of different classes of organic and inorganic phosphorus compounds in a number of different marine and lacustrine sediment environments. All samples ...
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(1994)Experiments have been conducted on the partitioning of noble metals in the presence of an H-O-C-S fluid in a high pressure gas apparatus at 1200-1300°C and 1-4 kbar fluid pressure. The fugacities of oxygen and sulfur, and ...
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(2001)We have investigated the distribution of photosynthetic pigments (chlorophyll and carotenoids), total organic carbon (TOC), and biogenic silica in the surface sediments throughout Lake Baikal and suggested factors controlling ...
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(1997)In situ measurement of the platinum group elements (PGE) and Re by laser ablation-ICPMS allows fractionation patterns to be established between host (kamacite) and Ni-rich exsolved phases (taenite and plessite). Measurements ...
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(2004)Bacteria and dissolved humic substances are capable of binding significant concentrations of metals in natural environments. Recent advances in understanding bacteria-metal and humic-metal complexation have provided a ...
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(1988)In this paper we discuss a continental crust section for S waves, based on data not previously used for the purpose. These are observations of waves converted from P into S waves in the lower continental crust (Ps converted ...
Now showing items 3194-3213 of 21936