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Browsing ELibrary by Title
Now showing items 2388-2407 of 21934
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(2001)A numerical cladistic analysis of the conodont family Palmatolepidae has been undertaken to determine the applicability of the technique to group-wide systematic revision. Results suggest a new hypothesis of relationships ...
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(1988)Fields of granitic pegmatites containing rare metals in industrially important Precambrian zones are accompanied by regional zones of hydrothermally-altered rocks containing high concentrations of hydromagmatophilic elements ...
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(2002)Magmas erupted at mid-ocean ridges (MORB) result from decompression melting of upwelling mantle. However, the mechanism of melt transport from the source region to the surface is poorly understood. It is debated whether ...
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CONSIDERATION ON THE OCCURRENCE OF THE AL13 POLYCATION IN NATURAL SOIL SOLUTIONS AND SURFACE WATERS (2001)Equilibrium speciation calculations were performed (1) for soil solutions and streamwaters collected in central and eastern France and (2) for simulated waters at 0 and 25°C, to assess the highest concentration of Al13 ...
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(2001)This paper considers the factors that influence ground CO2 fluxes as measured by the chamber method. New data and published results are used to illustrate the effects of various factors on CO2 emissions from the ground. ...
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(1990)A "double dipole" model with a zero moment was first used to describe faults in an earthquake focus by Honda and Vvedenskaya [l]. But until recently, publications dealing with alternative models continued to appear [2]. ...
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(1990)The existence of anomalously high heat flows near the surface would make it fundamentally impossible to solve the inverse problem of geothermometry, i.e., the determination on the basis of the heat flow, of the temperatures ...
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(2004)A disadvantage of fully non-linear methods of inversion, through exploitation of the properties of model space, is the absence of a well-developed framework for error assessment. To rectify this problem an auxiliary weighting ...
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(2004)Earth orientation parameters as observed by space-geodetic techniques show a broad spectrum of frequencies. Many efforts have been made to relate spectral peaks to geophysical processes, such as atmospheric or oceanic ...
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(2004)The Markovian model of mixed-layering that has been used until now for the modeling of X-ray diffraction (XRD) patterns of 2:1 phyllosilicates describes the mixed-layer crystals as stacks of 'layer units' (LUs) that associate ...
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CONSOLIDATION OF CONTINENTAL CRUST IN LATE ARCHAEAN-EARLY PROTEROZOIC TIMES: A PALAEOMAGNETIC TEST (2003)The proposition that continental crust consolidated during late Archaean-early Proterozoic times as spatially distinct groups of cratons is tested using palaeomagnetic results assigned to the interval 2900-2200 Ma. Geological ...
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(2004)The constitutive coupled equations describing ionic transport in a porous shale are obtained at the scale of a representative elementary volume by volume averaging the local Nernst-Planck and Stokes equations. The final ...
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(2001)Modeling water flow in unsaturated fractured rocks is of interest to many areas of active research, including geological disposal of nuclear waste and subsurface contaminant transport. A commonly used approach for modeling ...
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(2003)Results from a small set of laboratory experiments are presented here that help further constrain the processes governing the production of turbidity currents from impulsive failures of continental shelf and slope deposits. ...
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(2004)The study presented here sought to determine the PVT properties of Ice VII at elevated temperatures and pressures up to 60 GPa using a Mao-Bell type diamond anvil cell with an external Mo-wire resistance heater. The unit ...
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(1997)A method is proposed for calculating freezing point depressions in silicate systems of geologic interest using molecular dynamics simulations. The method directly determines the slope of the liquidus at a given composition ...
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(2000)We develop a new method, based on interference patterns between the precession and obliquity components of geological data from Ocean Drilling Program (ODP) Leg 154 and astronomical solutions, to extract small changes in ...
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(2002)New cores from the upper continental slope off Romania in the western Black Sea provide a continuous, high-resolution record of sedimentation rates, clay mineralogy, calcium carbonate content, and stable isotopes of oxygen ...
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(2004)Earlier piston-cylinder experiments in our laboratory produced a collection of mantle melting run products at 1.0 GPa that have now been analyzed by ion probe for selected REE, Ti, Cr, Rb, Sr, Y, Zr, and Nb. Natural starting ...
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(2004)The density jump $(ΔρICB )$ at the inner core boundary (ICB) is an important constraint on the dynamics and history of the Earth's core. Two types of seismological data sensitive to $ΔρICB $ have been studied since the ...
Now showing items 2388-2407 of 21934