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Browsing ELibrary by Title
Now showing items 5004-5023 of 21821
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(2003)The paper analyzes the geological structure, mineral parageneses, and composition of minerals of mantle rocks and the kimberlite groundmass, as well as the conditions of formation and the technique, of development of the ...
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(2004)The Kärdla crater is a 4 km-wide impact structure of Late Ordovician age located on Hiiumaa Island, Estonia. The 455 Ma‐old buried crater was formed in shallow seawater in Precambrian crystalline target rocks that were ...
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(2002)Since the opening of the Space Age, images from spacecraft have enabled us to map the surfaces of all the rocky planets and satellites in the Solar System, thus transforming them from astronomical to geological objects. ...
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(2004)Production of cosmogenic nuclides (CNs) in geologic material is a function of the cosmic-ray flux at the Earth's surface, which in turn is a function of the intensity and orientation of the Earth's geomagnetic field. ...
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(2006)The aim of this study was to generalize the data available for the paleointensity, polarity, and frequency of reversals, and variations in the direction of the geomagnetic field in the vicinity of the Paleozoic and Mesozoic ...
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(2005)The aim of this paper is to analyze the data available for the characteristics of the geomagnetic field during its reversals using the latest results. The main attention is given to the problems that arise during the ...
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(2005)The analysis of cosmogenic nuclides in an eroding surface yields information concerning erosion rates and exposure times. Such analysis requires accurate knowledge of the nuclide production rate at the site in question. ...
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(2004)A combined paleomagnetic and geochronologic study has been conducted on an andesite lava sequence at Jianguo (Liaoning province, northeastern China). Thermal demagnetization and thermomagnetic analysis revealed that natural ...
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(2000)We analyzed records of geomagnetic field intensity (paleointensity) during the last 700 kyr in five sediment cores from a wide region of the Pacific Ocean. A global paleointensity variation with a 100 kyr quasi-period was ...
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(2001)Existing geomagnetic main field models do not take adequate account of constraints implied by the magnetohydrodynamics of the core surface. Yet the flow is likely to be tangentially geostrophic in a region that is located ...
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(2004)Two assumptions are often made when computing Earth's core surface flows from geomagnetic data: the frozen-flux assumption and the tangentially geostrophic assumption. These assumptions impose some integral constraints on ...
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(2001)Methodology of determining the slope of pit edge has been considered. New approaches to controlling the stability of pit edge have been discussed. Initial tectonic stresses and secondary stresses in rock mass have been ...
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(2003)The detailed 3D geometry of normal fault planes is described and analysed using datasets from outcrop studies (2D), seismic surveys (3D) and analogue models (4D). Different geometric configurations of simple isolated normal ...
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(2004)Perovskite-type oxides are important in material sciences, physics and earth sciences. The ideal perovskite structure has an ABX3, stoichiometry and belongs to the cubic space group Pm3m. However, there are several structural ...
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(2000)Based on the data available for the recent vertical movements of the Earth crust (VMEC), depicted in the Map of Recent Tectonics, scale 1:5 000 000, the geometric characteristics of the recent deformations of the North ...
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(2002)There are very few field measurements of nearshore bedforms and grain-size distribution on low-energy microtidal beaches that experience low-amplitude, long-period waves. Field observations are needed to determine grain-size ...
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(2002)The paper addresses parametric resonances, the phenomena fraught with natural and technical risk which arise only in cracked solids and never in classical continuous media. The resonances are induced by periodic oscillations ...
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(1995)Manceau's (1995) reinterpretation of some of our EXAFS results (Waychunas et al., 1993) has been analyzed using both old and newly collected data in an attempt to clarify the nature of proposed monodentate and edge-sharing ...
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(2004)In most geological instances, 2-D or 3-D fracture distributions are not available from field data. We show here that when data relative to fractures are collected along a line such as a road or a well, estimations can be ...
Now showing items 5004-5023 of 21821