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Browsing ELibrary by Title
Now showing items 7268-7287 of 21768
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(2002)A new probe for autonomous high precision temperature measurements in deep sea sediments has been developed by Fa. Antares and the University of Bremen and extensively tested during several expeditions. The miniaturized ...
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(2001)Calculation of complete and constrained chemical equilibrium in multicomponent multiphase and heterogeneous systems is reduced to the problem of convex programming. A set-theory system of notation is introduced for ...
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(1987)The paper discusses the shallowest possible sea depths at which copper-zinc sulfide mineralization is emplaced from hydrothermal solutions, given the possible effect of flashing of these solutions on ore genesis. Massive ...
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(2001)Review of international practical experience in mining the gold by methods of heap and underground leaching has been presented. Brief characteristics of production processes at particular enterprises have been considered. ...
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(1997)Minor and trace element (Na, Cl, Mg, K, Sr) abundances in gypsum and anhydrite can be used to help elucidate paleosalinity and depositional environments. However, sulfates may contain abundant fluid and solid inclusions ...
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(1997)Regular, geometric, apparently crystallographically-controlled, sector zoning has been produced in synthetic anorthite crystallized from a liquid of Type B Ca,Al-rich inclusion (CAI) composition. Cathodoluminescence (CL) ...
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(2001)More than 19,000 analytical data mainly from the literature were used to study statistically the distribution patterns of F and the oxides of minor and trace elements (Ti, Sn, Sc, V, Cr, Ga, Mn, Co, Ni, Zn, Sr, Ba, Rb, Cs) ...
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(2001)The diatom flora from the Miocene deposits of Ukraine was studied. Diatom zonation for the Early Miocene to Late Miocene is proposed. The first and last occurrences of diatoms, mass development of taxa, and level of ...
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(2000)Local Miocene Stratigraphic Schemes for different plain areas in the Crimea are substantiated and correlated with the Crimea-Caucasus regional scale validated in adjacent territories. New data are used to elucidate the ...
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(1999)The Matuyama–Brunhes boundary (MBB) where the Earth's magnetic field changed to its present orientation is one of the most frequently used time markers in continental Quaternary stratigraphy. Although magnetic signals have ...
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(1997)Experiments with gypsum in aqueous solutions at 25°C, low ionic strengths, and a range of saturation states indicate a mixed surface reaction and diffusional transport control of gypsum dissolution kinetics. Dissolution ...
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(1999)We present the first study of present-day mixing efficiency of the Earth that is based on a 3D spherical model of convection in the Earth's mantle. The stationary model we employ is derived from the present-day slab buoyancy ...
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(2001)Measured values of mol fraction (X) and δ13C in the Fe(CO3)OH component of 49 samples of goethite (α-FeOOH) from a wide variety of environments range from 0.0015 to 0.0182 and from -21.7 to +3.3%%, respectively. The ...
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(2003)A detailed geochemical study of fluids from representative quartz-sealed faults hosting late Hercynian gold concentrations shows that fluids percolating the mineralised faults had two main distinct reservoirs: one was a ...
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(1989)The postsedimentation process of greatest extent in the ocean, occurring nearly everywhere, is mixing of the upper layer of bottom sediments by benthic organisms. The number of radioactive elements with steady fluxes into ...
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(2001)New biostratigraphic evidences from a core drilled in the central part of the 40 km diameter submarine Mjølnir meteorite crater on the Barents Shelf are presented. The data suggest a stratigraphical age for the meteorite ...
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(2000)During spiral growth of the calcite rhombohedron {1014}, divalent metals substituting for Ca2+ are differentially incorporated due to steric differences inherent to the asymmetric kink sites exposed at nonequivalent growth ...
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(2004)A study on Zn replacement in sphalerite by divalent Mn has been performed by using EPR spectroscopy. Twelve natural and synthetic samples with different Mn-contents were selected for the spectroscopic investigation. The ...
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(2004)The speciation of Mn, Fe, As, and Zn in a fast-growing (0.02mm/yr), shallow-marine, ferromanganese nodule has been examined by micro X-ray fluorescence, micro X-ray diffraction, and micro X-ray absorption spectroscopy. ...
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(2004)We have conducted a detailed study of the Mn-Cr systematics of the angrite D'Orbigny. Here, we report Cr isotopic abundances and Mn/Cr ratios in olivine, pyroxene, glass, chromite, and bulk rock samples from D'Orbigny. ...
Now showing items 7268-7287 of 21768