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Browsing ELibrary by Title
Now showing items 260-279 of 21936
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(1986)This study, largely based on field observations in various peridotite massifs and on basalt xenoliths, traces the successive stages of melt extraction from mantle diapirs. The first stage, initiated in the garnet lherzolite ...
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(2005)Morphologies, petrographic settings and carbon and nitrogen isotopic compositions of graphites in the Acapulco meteorite, the latter determined by secondary ionization mass spectrometry, are reported. Seven different ...
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(1999)We describe a new technique for analyzing 231Pa in silicate rocks by isotope dilution mass spectrometry. This technique is different from the technique developed by previous studies () and also permits the determination ...
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(2004)Quantitative P -T path determination in metamorphic rocks is commonly based on the variation in composition of growth-zoned garnet. However, some component of growth zoning in garnet is necessarily the result of an effective ...
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(2001)The deformability of jointed rock masses is associated with the elastic properties of the intact rocks as well as the geometric structure and the stiness of the geo- logical discontinuities within the rock masses. Determination ...
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(2002)A method for conodont identification in thin and polished sections based on morphological and histological features is discussed. The diagnostic key and examples from the Lower Carboniferous of the Subpolar Ural Mountains ...
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(2000)The increasing analytical precision of 40Ar-39Ar geochronological data and its use in studies that combine U-Pb and 40Ar-39Ar data has necessitated derivation of a means to intercalibrate ages between the two isotopic ...
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(2002)A method is proposed for measuring the modulus of the geomagnetic flux through an arbitrary contour on the Earth''s surface and its relatively slow variations with the help of a multicoil loop, the number of its coils ...
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(1986)Analyses of more than 1800 basaltic rocks from different geotectonic settings define a new discrimination diagram using the immobile trace elements Nb, Zr and Y. The diagram distinguishes between different types of mid-ocean ...
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(2002)A field test and analysis method has been developed to estimate the vertical distribution of hydraulic conductivity in shallow unconsolidated aquifers. The field method uses fluid injection ports and pressure transducers ...
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(2003)We highlight benefits resulting from a simple modification to the conventional Thellier–Coe (CTC) method of palaeointensity determination. A consideration of current theory pertaining to partial thermoremanence (pTRM) ...
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(2003)A reliability-based methodology for the design of rock slopes, that can easily be implemented by the practicing engineers is proposed. The advanced first-order second-moment (AFOSM) method is adopted as the reliability ...
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(1999)During the last 12 thousand years the Udokan volcan oes erupted alkaline basalts and trachites. The strike of the fissure magma channels changed fr om NW to NE during the Middle Holocene in the interval of 7.9-4.6 thousand ...
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(1996)Establishing an accurate and precise age for Siberian flood-basalt volcanism is of great importance in evaluating causes for the unequaled mass extinction of flora and fauna at the Permian-Triassic boundary. We report a ...
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(2001)Opening mode of the Japan Sea is studied from the viewpoint of geologic structure around the western marginal fault zone of the back-arc basin. Latest reflection seismic survey in the Fukue Basin, located at the western ...
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(2003)The evolution of permeability and flow in a karst aquifer is studied by numerical simulations. The aquifer considered consists of a large central fracture, a network of finer fissures, and a porous rock matrix. Enlargement ...
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(2003)“Plateau” δ18O values of CO2 that evolved from the Fe(CO3)OH component during isothermal vacuum dehydrations (200–230 °C) of 18 natural goethites range from 8.2 to 28.1‰. In contrast, the measured δ18O values of the goethite ...
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(1993)Infrared spectra of H 2 O - and D 2 O - NaAlSi 3 O 8 (albite) glasses were measured and contain two major differences from the anhydrous glass spectra. The first is the presence of a number of bands above 3000 cm -1 arising ...
Now showing items 260-279 of 21936