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Browsing ELibrary by Title
Now showing items 13733-13752 of 21879
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(1997)We have analyzed the stable carbon isotope ratios of various organic-walled microfossils preserved in marine sediments of Silurian and Devonian age. The aim of this study is to determine the amplitude of isotopic fractionations ...
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(2004)Variability in sorbed water content was studied on several standard smectites, as dependent on the relative humidity (RH=0.5, 0.95 and 1.0), on temperature (constant 30 °C and variable room temperature) and on sorption ...
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(2000)Three sediment cores from the Laptev Sea continental margin were investigated for their clay mineralogy by X-ray diffraction to study the fluvial sediment supply since the late Weichselian. In the study area, the clay-mineral ...
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(2000)In order to reconstruct the depositional environment from the Laptev Sea continental slope and shelf during the past ~15,000 years BP maceral analysis was carried out on two sediment cores (PS2458-4, PS2725-5) and compared ...
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(1996)Reinterpretation of field studies of bedload transport allowed some power-law relations to be obtained between different quantities. They were taken as a basis for the construction of a numerical model simulating bedload ...
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(1998)The isotopic characterization of trace organic species produced during biomass burning may allow a better understanding of the source and fate of combustion-derived organic matter. In order to assess the utility of compound ...
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(1993)This paper discusses the distribution of trace element concentrations in cogenetic suites of lavas, based on the study of trace element histograms. For each histogram, the variability is calculated (V = s/m, where m is the ...
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(1992)The ratio has been measured in Hg fractions released by stepwise heating (and in four cases in solvent extracts) from bulk samples of 17 different stone meteorites using the radiochemical neutron activation (RNA) method. ...
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(2004)Major and trace element compositions and Sr, Nd, Pb, and Hf isotope ratios of Aleutian island arc lavas from Kanaga, Roundhead, Seguam, and Shishaldin volcanoes provide constraints on the composition and origin of the ...
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(2003)Predictive thermal history modelling using apatite fission-track (FT) data is dependent on an algorithm to describe the time and temperature dependency of FT annealing which, in turn, relies on the empirical determination ...
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(2003)A comparison of published calcite dissolution rates measured far from equilibrium at a pH of ~ 6 and above shows well over an order of magnitude in variation. Recently published AFM step velocities extend this range further ...
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(2002)Far-from-equilibrium batch dissolution experiments were carried out on the 2000-500, 500-250, 250-53 and 53-2 μm size fractions of the mineral component of the B horizon of a granitic iron humus podzol after removal of ...
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(2001)The structures and concentrations of hopanoids, a family of pentacyclic triterpenoids, were analysed to determine their contribution to the alkyl carbon with increasing soil depth of a Haplic Podzol (from the Oi to the Bs ...
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(1987)The paper reports on a study whose results indicate that the Oligocene ocean was colder than the present-day ocean in this latitude belt. But this does not mean that the global mean temperature in the Oligocene was lower ...
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(1990)To determine whether the dynamics of variation in chemical composition of ferromanganese nodules (PMN) depends on their geologic age, the authors used the composition of nodules growing on shark teeth. The latter have ...
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(1988)Most oceanic hotspot swells are associated with anomalously shallow seafloor and broad geoid anomalies. These depth and geoid anomalies are generally positively correlated and linearly related. The linear relationship can ...
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(2002)The variation of the oxygen content in olivines, (FexMg1-x)2SiO4, with 0.2 ≤ x ≤ 1.0, was investigated by thermogravimetric measurements. Mass changes occurring upon oxygen activity changes were measured as a function of ...
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(1982)The kinetics of metamorphism of the Staroe Boriskino C2 chondrite heated at 450°C in an inert atmosphere of helium flow was investigated. After being heated at 450°C during 160 minutes one specimen was moreover heated for ...
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(1987)The distribution of the macrocomponents of sea water is governed primarily by salinity. But several investigators have found a variation in the cation-chloride ratios, ranging from 1 to several percent (see, e.g., [1-8]). ...
Now showing items 13733-13752 of 21879