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Browsing ELibrary by Title
Now showing items 11657-11676 of 21936
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(2001)Isotopic compositions of biogenic iron minerals may be used to infer environmental conditions under which bacterial iron reduction occurs. The major goal of this study is to examine temperature-dependent isotope fractionations ...
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(2001)We present a numerical scheme for the computation of conservative fluid velocity, pressure and temperature fields in a porous medium. For the velocity and pressure we use the primal-dual mixed finite element method of ...
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(1995)Rapid conduction of heat through the top surface of young oceanic lithosphere can contribute at least some of the heat necessary for high-temperature-low-pressure metamorphism of rock buried in subduction zones and, perhaps, ...
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(2003)This study assesses temperatures of formation of common granulites by combining experimental constraints on the P–T stability of granulite-facies mineral associations with a garnet–orthopyroxene (Grt–Opx) thermobarometry ...
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(2003)An in situ method for estimating parameters necessary for characterizing unsaturated flow in porous media has been applied to 37 individual data sets from the same study site (a sand dune on the edge of a wetland). The ...
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(2004)Variation of CH4 emissions over a three-year period was studied in a reed-dominated (Phragmites australis) littoral transect of a boreal lake undergoing shoreline displacement due to postglacial rebound. The seasonal ...
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(2002)A record of changes in Pb and Sr isotopic composition of two cores (DSDP 86 576A and LL44 GPC3) from the red clay region of the central North Pacific has been determined for the past 60–65 million years. The isotope records ...
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(2002)Photosynthetic pigments and other indicators of phytoplankton were analyzed in a dated undisturbed sediment core obtained from the southern basin of Lake Baikal to reveal temporal changes in the phytoplankton community in ...
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(2002)We compare the aftershock decay rate in natural data with predictions from a stochastic analytical model based on a Markov process with stationary transition rates. These transition rates vary according to the magnitude ...
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(1992)The Sr-, Nd- and Pb-isotopic compositions of lavas from the 248-Ma-old Siberian Flood Basalt Province (SFBP) become increasingly uniform with height as the main phase of volcanic activity is approached. The late-stage lava ...
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(1998)The concentration and δ15N of NO3- in leachate from two undisturbed and unfertilized soil lysimeters, one conventionally tilled and one with no tillage, was determined on a bi-weekly basis from March through November, 1993 ...
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(2000)A fundamental issue in aquifer biogeochemistry is the means by which solute transport, geochemical processes, and microbiological activity combine to produce spatial and temporal variations in redox zonation. In this paper, ...
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(1996)Redistribution of mass both on and within the Earth due to the direct and indirect effects of the late Pleistocene glaciation-deglaciation process changes the principal moments of inertia of the planet, and consequently ...
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(1992)A microscopic study of ores of the Kedabek deposit revealed unusual microtextures of intimate intergrowths of fine grains of chalcopyrite, fahlore (tetrahedrite), arsenopyrite and sphalerite. These textures result from ...
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(2001)Volcanic ash layers in North Pacific deep-sea sediment provide a record of episodic explosive volcanism in the Kamchatka–Kurile and Aleutian arcs over the past five million years. We counted 450 ash layers, determined layer ...
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(2001)Humic acid adsorption onto the bacterial surface of Bacillus subtilis was measured with and without Cd, as a function of pH and humic-bacteria-Cd ratios. These experiments tested for the existence of ternary interactions ...
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(2000)The former decay of 182Hf to 182W (T1/2=9 Myr) has resulted in variations in W isotope composition that reflect early solar system time-integrated Hf/W ratios. The bulk silicate Earth (BSE) has non-chondritic Hf/W because ...
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(2004)This paper presents a critical evaluation of popular concepts on the 143Nd/144Nd, 176Hf/177Hf, 87Sr/86Sr, Sm/Nd, Lu/Hf, and Rb/Sr ratios in the Earth's primitive mantle. We examined the major controversies ensuing from the ...
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(2001)Cosmogenically enriched 38Ar/36Ar ratios are detectable in Ca-bearing terrestrial samples, and are resolvable from a uniform background value of 0.18826+/-0.00018 for materials lacking nucleogenic or kinetic mass fractionation ...
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(1995)Calculations for the production of cosmogenic nuclides in the Earth's atmospheric and in-situ in the surface are reported and discussed. We calculated production rates of 3H, 7Be, 10Be, 14C, and 36Cl in the atmosphere by ...
Now showing items 11657-11676 of 21936