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Now showing items 5247-5266 of 39124
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(2003)The objective of this study was to discern the source of higher than usual concentrations of chloride in drainage water collected from experimental forest plots after clear-cutting. When the sandbox experiments were initiated ...
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(2001)The compositionally typical H5 chondrite St-Robert has an exposure age, 7.8 Ma, indistinguishable from that of the main cluster of H chondrites. Small values of the cosmogenic 22Ne/21Ne ratio in interior samples imply a ...
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(2003)Exsolution and coarsening in Fe-free clinopyroxene of composition En45.1Di54.9 was studied at temperatures of 1300, 1200, and 1100°C, and annealing times between 10 min and 4320 h. Based on the wavelength of the exsolution ...
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(1993)Eclogite xenoliths from the mantle have experienced a wide variety of processes and P-T conditions, many of which are recorded in the mineral compositions and textures. Exsolution of garnet from clinopyroxene is one such ...
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(1997)To understand Cl dissolution in aluminosilicate liquids and the exsolution of Cl-rich magmatic volatile phases, experiments were conducted to determine the solubility of NaCl, KCl, and H2O in felsic liquids at 0.5 and 2 ...
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(1995)In oils and Precambrian- to Miocene-age source rocks from varying depositional environments, we have conclusively identified several novel 3-alkyl sterane and triaromatic steroid series, including (1) 3β-n-pentyl steranes, ...
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(2001)In this paper we demonstrate application of the Extended Self-Similarity (ESS) concept, recently developed in turbulence physics, for geological and geophysical phenomena. The theoretical background is discussed first and ...
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(2000)We have studied with an aspect-ratio four box the thermal–chemical convective evolution with strongly temperature- and depth-dependent viscosity and moving heat sources within the extended-Boussinesq framework, in which ...
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(2004)A new model of the quiet-time, near-Earth magnetic field has been derived using a comprehensive approach, which includes not only POGO and Magsat satellite data, but also data from the Orsted and CHAMP satellites. The ...
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(2001)A new technique that uses multicollector plasma-ionization mass spectrometry (MC-ICP-MS) for the determination of Ag isotopic composition is reported. By correcting for instrument-induced mass fractionation of Ag by ...
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(1987)Extensional processes predominate in the system of island arcs and marginal seas as confirmed by complexes of parallel dikes in the corresponding paleostructures and by seismic and other data in present-day marginal seas ...
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(2004)DaG 896 is an olivine-rich microporphyritic rock of komatiitic composition. Both the olivine composition (Fa17.5±2.1, [Mn/Mg] = 0.0061) and the bulk oxygen isotopic composition (δ O = +2.55, δ O = +3.50) indicate that DaG ...
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(1999)Organic matter loading in continental margin sediments frequently occurs at a concentration equivalent to a monolayer coating of mineral grains, raising the question of whether adsorbed organic matter is indeed dispersed ...
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(2002)One aspect of the inherent disorder in silicate glasses and melts is the intermixing among framework units, which has important implications to the macroscopic properties of silicate magmas. We present experimental evidence ...
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(2003)We have found clear evidence of live 10Be in five normal Type A Calcium-aluminum-rich inclusions (CAIs), one normal Type B CAI, and one FUN Type A CAI, all from CV3 chondrites. The (10Be/9Be)0 ratios range from ∼0.36 × ...
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(2003)The geological history of the families Platanaceae and Hamamelidaceae is studied on the basis of original fossil material and available literature. The evolutionary stages of morphological and taxonomic diversity are ...
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(2003)We present estimates of ''realizable'' influx of selected cosmogenic isotopes, 3He, 10Be, 26Al, and 14C, and platinum group elements, Ir, Os, and Re on the earth via influx of meteoroids. We define realizable as the ...
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(1988)Magnetic fractions separated from four deep sea sediments from the Pacific Ocean were analysed for elemental abundances and isotopic ratios of noble gases by stepwise heating. A ratio of (1.8 ± 0.4) × 10−4 was observed in ...
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(2001)The relationship between the K-Ar dates of mixed natural clays and the ratios of detrital and diagenetic components follows in most cases a linear trend, which agrees with the theory when the K2O contents of the end-members ...
Now showing items 5247-5266 of 39124