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Now showing items 16623-16642 of 39124
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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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(PANGAEA, 2004-11-19)
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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]). ...
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VARIATIONS IN 129I/127I RATIOS IN RECENT MARINE SEDIMENTS: EVIDENCE FOR A FOSSIL ORGANIC COMPONENT (1998)The value of the pre-bomb 129I/127I ratio in the hydrosphere is important for the use of this isotope system for dating and tracing purposes. In order to determine this value and to examine spatial variability, 129I/127I ...
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(2003)We report here a signal in the temporal variation of stable isotopes in protein from surviving animal bone in Northwest Europe over the past glacial cycle. There is a change in the average δ13C values of fauna in the ...
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(2004)A collection of 55 samples of Yakutian kimberlites was studied using various methods (ICP-MS, XRF, determination of Pb, Nd, and Sr isotopic ratios, and others). According to indicative chemical parameters (TiO2-K2O, ...
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(1990)Time-dependent variations in the chemical and even isotopic compositions of natural hydrocarbon gases released into the atmosphere from mineral springs and out-gassing wells have been reported before. This effect is ...
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(2000)Two associations were revealed among the Northern group volcanoes in Kamchatka by study of chemical and isotopic composition of their lavas. The first association includes volcanoes located north of the Kamchatka River, ...
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(2001)We made a systematic examination into the effects of chemical treatments on Mg/Ca, Na/Ca, and Sr/Ca ratios of coral skeletons. Five skeletal samples were cut from modern and fossil corals of the genus Porites. Each sample ...
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(2001)Time-dependent variations in the physicochemical properties of pyrite were investigated in four sediment cores from the Black Sea. In the laminated, deep-basin sediments of Unit I and Unit II, >86% of pyrite particles are ...
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(2002)The production of 10Be in the Earth’s atmosphere depends on the galactic cosmic ray influx that, in turn, is affected by the solar surface magnetic activity and the geomagnetic dipole strength. Using the estimated changes ...
Now showing items 16623-16642 of 39124