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Browsing ELibrary by Title
Now showing items 2575-2594 of 21934
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(2002)Since the mid-1980s, cosmogenic 10Be, with a 1.5 Myr half-life, has proven to be an extremely useful tool for studies of the solid Earth and surface processes. Measured at very low concentrations ...
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(1996)Calcium is a major target element for cosmogenic 36Cl production. Consequently 36Cl rapidly reaches detectable levels in minerals such as calcite and calcium feldspar exposed at the Earth's surface. Spallation of calcium ...
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(1998)At depths below a few metres, 36Cl production in calcite is initiated almost entirely by cosmic ray muons. The principal reactions are (1) direct negative muon capture by Ca; 40Ca(μ-,α)36Cl, and (2) capture by 35Cl of ...
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(2002)The decay of formerly live 182Hf with a half-life of 9 Myr results in variations in the abundance of 182W in early solar system objects. Here we demonstrate that major excesses in 182W in some lunar samples are the results ...
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(2002)Since the mid-1980s, cosmogenic 10Be, with a 1.5 Myr half-life, has proven to be an extremely useful tool for studies of the solid Earth and surface processes. Measured at very low concentrations using a particle accelerator, ...
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(2004)Counts of taxonomic richness and derivates such as origination and extinction rates should ideally be scaled against absolute time. However, calibration of the fossil record with absolute time is often wanting or lacking ...
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(2003)Recent developments in multiple-collector magnetic-sector ICP-MS (inductively coupled plasma-mass spectrometry) have permitted the relative abundances of the two isotopes 63 and 65 of copper to be measured with unprecedented ...
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(2002)138Ce/142Ce and 143Nd/144Nd isotope ratios of lunar samples are determined to constrain the petrogenetic differentiation and evolution of the moon. High-precision Ce-Nd isotope data, well-defined Rb-Sr isochrons, and rare ...
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(1999)Experiments on degassing of water-saturated granite melts with a pressure drop from 100 and 450 MPa to 40 and 120 MPa, respectively, at temperatures close to feldspar liquidus (750–700 °C), were carried out to determine ...
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(2002)We report major-element, trace-element and isotopic data of volcanic rocks from the late-Neoproterozoic (570 Ma) Agardagh Tes-Chem ophiolite in Central Asia, south-west of Lake Baikal (50.5N, 95E). The majority of samples ...
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(2004)We address the gradual transition from brittle failure to cataclastic flow under increasing pressures by a new model, incorporating damage rheology with Biot’s poroelasticity. Deformation of porous rocks is associated with ...
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(2001)An 11-meter-wide alkalic monchiquite dike recovered from the subsurface of Louisiana has produced a metasomatic aureole in the adjacent interbedded carbonate mudstones and siltstones. The asymmetric contact aureole, which ...
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COUPLED INVERSE MODELLING OF GROUNDWATER FLOW AND MASS TRANSPORT AND THE WORTH OF CONCENTRATION DATA (2003)This paper presents the extension of the self-calibrating method to the coupled inverse modelling of groundwater flow and mass transport. The method generates equally likely solutions to the inverse problem that display ...
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(2004)The hypothesis that the soluble fraction of the organic compounds present in carbonaceous chondrite meteorites was formed during aqueous alteration of the parent body was tested with mass-transfer, reaction-path calculations. ...
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(2003)A Landau potential with linear-quadratic coupling has been developed to describe interactions between a non-convergent order parameter, QOD, for Fe/Mg ordering, and the order parameter, QD, for the C2/c-P21/c phase transition ...
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(2005)Advances in field observations and experimental petrology on anatectic products have motivated us to investigate the geochemical consequences of accessory mineral dissolution and nonmodal partial melting processes. ...
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(2001)The coupling of viscosity and diffusivity during explosive volcanic degassing is investigated using a numerical model of bubble growth in rhyolitic melts. The model allows melt viscosity and water diffusivity to vary ...
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(2001)The applicability of size-exclusion chromatography (SEC) coupled online with a high resolution ICP-MS (HR-ICP-MS) to investigate the speciation of the platinum-group elements (PGE), Rh, Pd and Pt, was evaluated. Experiments ...
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(2003)We present an extension to the coupling scheme of the spectral element method (SEM) with a normal-mode solution in spherical geometry. This extension allows us to consider a thin spherical shell of spectral elements between ...
Now showing items 2575-2594 of 21934