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Browsing ELibrary by Title
Now showing items 71-90 of 21821
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(2004)Using classical diffusion theory, we present a mathematical technique for the determination of 4He concentration profiles in minerals. This approach should prove useful for constraining the low-temperature cooling histories ...
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(2002)5-n-Alkylresorcinols with alkyl chain lengths varying from C19 to C25 were identified solely in bog-forming plant species classified as sedges (Eriophorum vaginatum, E. angustifolium, Trichophorum cespitosum and Rhynchospora ...
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(1999)The model of Cr isotopic evolution presented here, relies on the relative volatility properties of the two elements: Mn-Cr in planetary formation processes. The Mn/Cr ratio of the respective parent bodies correlate in most ...
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(2003)Mössbauer spectra (MS) of two natural magnesian hedenbergite samples (hereafter HED1 and HED2) were collected at temperatures in the range 35 to 800 K. At selected temperatures a longitudinal external field of 60 kOe was ...
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(2003)The magnetic properties of two natural magnesian hedenbergite samples with slightly different Fe contents (hereafter denoted HED1 and HED2) were studied by transmission 57 Fe Mö ssbauer spectroscopy within the temperature ...
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(2003)Three natural Fe-bearing diopside samples, hereafter labeled Dp1, Dp2, and Dp3, have been examined by Mössbauer spectroscopy at temperatures from 4.2-800 K. The Fe contents are 0.01, 0.06, and 0.30 atoms per formula unit ...
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(1998)Three excentroradial pyroxene chondrules from the Semarkona unequilibrated chondrite were analysed by ion microprobe mass spectrometry for their Li-Be-B concentrations and Li and B isotopic compositions. The concentrations ...
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(2003)We demonstrate the use of the disequilibrium between 90Sr (t1/2=29.1 yr) and its particle-reactive daughter 90Y (t1/2=64 h) to estimate particle removal rates and settling velocities in the epilimnion of a freshwater lake ...
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(2005)Metallogenic provinces in Europe range in age from the Archaean to the Neogene. Deposit types include porphyry copper and epithermal Cu–Au, volcanic-hosted massive sulphide (VMS), orogenic gold, Fe-oxide–Cu–Au, anorthosite ...
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(2002)A possible mesosiderite meteorite was found in the area of the Putorana Plateau, Noril'sk district, Siberia, Russia. Although this rock resembles a mesosiderite in its hand-sample aspect and in having Ni-bearing iron metal, ...
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(1996)Continental records of Plio-Pleistocene climatic fluctuations are often confined to fragmentary, localized basins, and not easily dated. One exception is the Confidence Hills of Southern Death Valley. In this study, we ...
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(2001)The Kolvitsa Belt in the south-western Kola Peninsula formed coeval with the earliest Palaeoproterozoic rift-belts in the Fennoscandian Shield. The Palaeoproterozoic history of this belt comprises the deposition of the ...
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(1997)The reconstruction of geomagnetic field intensity variations during the last 200 kyr from paleomagnetic data is at present the subject of numerous studies and major debate. There is currently no generally accepted record. ...
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(2003)An accurate and efficient 3-D finite-element (FE) forward algorithm for DC resistivity modelling is developed. First, the total potential is decomposed into the primary potential caused by the source current and the secondary ...
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(1995)Three-dimensional (3-D) numerical modelling in a rectangular box is provided for the evolution of mantle structure induced by two floating continents. As initial state we take quasi-steady state mantle convection with many ...
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(2000)Acid volatile sulfur extracted from ureilite meteorites carries a small 33S enrichment relative to carbonaceous chondrites, enstatite chondrites, ordinary chondrites, and troilite from iron meteorites: Δ33S (=δ33S - 1,000 ...
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(2002)A high resolution, cross-borehole, 3D electrical resistivity tomography (ERT) study of solute transport was conducted in a large experimental tank. ERT voxels comprising the time sequence of electrical images were converted ...
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(1986)New barometer based on the equilibrium: CaFe 2 Al 2 Si 3 O 12+2 \hspace{0.17em} TiO 2=2 \hspace{0.17em} FeTiO 3+ CaAl 2 Si 2 O 8+ SiO 2 garnet ( Gr 1 Alm 2) \hspace{0.17em} rutile \hspace{0.17em} Ilmeoite \hspace{0.17em} ...
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(2002)We introduce a dynamic linear model in which the observation equations are perturbed by a form that has constant (over time), non-random coefficients and may represent the disturbing gravity field under investigation. ...
Now showing items 71-90 of 21821