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Now showing items 5783-5802 of 39004
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(2004)We report new absolute palaeointensity estimates using basalts from northeastern China (K/Ar age, 125-120 Ma) using the modified Shaw method in conjunction with the microwave technique. Samples for the palaeointensity ...
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(1993)The experimental study of the miscibility gap in the FeS2CoS2 system at different particle sizes with previously reported theoretical data on the miscibility in small-crystallite binary systems gives evidence for a ...
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(2003)In the present paper, we further examine the optimum conditions for rapid, precise and accurate determination of 234U/238U ratios in geological materials by multiple collector (magnetic-sector) inductively coupled plasma ...
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(2000)Introduction of the Melekhov Horizon into the regional stratigraphic scale for the Upper Carboniferous of the Russian Platform is discussed. The new horizon corresponds to a separate regional sedimentation cycle that ...
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(2004)The curve depicting generic diversity of Permian fusulinids has two distinct peaks: the Asselian-Sakmarian and Midian. The in-between minimum corresponds to the end of the Bolorian Age. The most significant extinctions of ...
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(2001)A fuzzy conceptual rainfall-runoff (CRR) framework is proposed herein to deal with those parameter uncertainties of conceptual rainfall-runoff models, that are related to data and/or model structure: with every element of ...
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(2003)Gabbroids were dredged together with ultrabasic rocks from the lower portion of the section of a large transverse ridge in the southern flank of the Vema Fracture Zone valley in the Central Atlantic. Their petrographic ...
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(1997)The solubility of α-GaOOH was measured in low ionic strength (0.025 M) HClNaCl solutions over the pH range 1.6–4.1 at 150, 200, and 250°C. A least squares linear regression of these data was used to determine the dissociation ...
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(1997)The solubility of α-GaOOH was measured in low ionic strength (0.025 M) HCl-NaCl solutions over the pH range 1.6–4.1 at 150, 200, and 250°C. A least squares linear regression of these data was used to determine the dissociation ...
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(2002)Results derived from gamma-ray spectrometry studies of volcanic rocks in a depth interval of 3540-8150 m are presented. The rocks are shown to have low concentrations of radioactive elements, which is consistent with the ...
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(2000)Rocks consisting almost entirely of diamonds (diamondites) that contain minor amounts of silicates were analyzed for trace element abundances in the silicates by Laser Ablation ICP Mass Spectrometry for the first time. ...
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(2000)Melting experiments of a representative mantle composition doped with some key trace elements were conducted under hydrous conditions at pressures to 20 GPa. The results demonstrate that only ~5-25% of garnet fractionation ...
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(2001)Garnet granulite facies xenoliths hosted in Devonian lamprophyres from the Kola Peninsula are interpreted to represent the high-grade metamorphic equivalents of continental flood tholeiites, emplaced into the Baltic Shield ...
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(1988)Finds of garnet peridotite xenoliths in Cenozoic volcanics are fairly rare. Until recently, only three such finds were known on the Vitim plateau, in Pliocene rocks of the Kandiduskha and the Yasha paleo-volcanoes. We give ...
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(1993)A suite of large and fresh peridotite xenoliths from a picrite tuff deposit in the Cenozoic Vitim volcanic field, {small tilde}200 km east of Lake Baikal, shows a continuous gradation from protogranular spinel through ...
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(2003)Detailed 3-D analysis of inclusion trails in garnet porphyroblasts and matrix foliations preserved around a hand-sample scale, tight, upright fold has revealed a complex deformation history. The fold, dominated by interlayered ...
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(2004)Some new data concerning the chemical composition of postmagmatic garnets and associating minerals from various alteration zones of potassic rhyolites and granites in the central part of the Au-Ag Dukat ore field are ...
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(2002)Clinozoisite gneisses were studied from the Barchi-Kol area, located 17 km to the west of the Kumdy-Kol microdiamond deposit at Kokchetav massif (Northern Kazakhstan). As distinct from the deposit, the studied rocks are ...
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(1986)New experimental data on compositions of garnets in two-pyroxene — garnet assemblages in the system CaO −MgO −Al2O3 −SiO2 (CMAS) are presented for conditions between 1,100 and 1,570° C and 30 to 50 kb. Garnets in these ...
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(1999)Experiments in the FMASCr system at pressures of 30-50 kbar and temperatures of 1200-1500°C model mineral equilibria in depleted mantle harzburgite. Special emphasis was on the partitioning of chromium between garnet, ...
Now showing items 5783-5802 of 39004