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Now showing items 10872-10891 of 43490
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(1999)Some reactions that control the dissolution of bayerite [β-Al(OH)3(s)] and boehmite [γ-AlOOH] were identified by comparing the adsorption chemistry, the dissolution rates, and solid-state 19F-NMR spectra of the reacting ...
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(1981)Artyushkov, E.V., 1981. Mechanisms of continental riftogenesis. In: J.H. Illies (Editor), Mechanism of Graben Formation. Tectonophysics, 73: 9–14. Rift valleys are formed along high and strongly elongated uplifts on the ...
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(2006)Aragonite was precipitated in the laboratory at 25 °C in isotopic equilibrium with Na-Ca-Mg-Cl-CO3 solutions at two different pH values (i.e., pH = ?8.2 and ?10.8) by the constant addition method. On the basis of the oxygen ...
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(2006)The incorporation and diffusion of hydrogen in San Carlos olivine (Fo90) single crystals were studied by performing experiments under hydrothermal conditions. The experiments were carried out either at 1.5 GPa, 1,000°C for ...
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(2006)Mechanisms of the incorporation of isomorphic impurities of Al, Ti, and Ge into quartz were studied by EPR techniques. For this purpose, laboratory experiments were carried out on quartz annealing, which allowed us to model ...
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(2001)Gravitational instability of the continental lithospheric mantle is often associated with orogenic activity. Recent theoretical and experimental developments in the understanding of the convective instability of a dense ...
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(2003)It has been proposed that the high concentrations of moderately siderophile elements (e.g. Ni and Co) in the Earth's mantle are the result of metal-silicate equilibration at the base of a deep magma ocean that formed during ...
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(1998)Experiments dissolving orthopyroxene (En93) in a variety of Si-undersaturated alkaline melts at 1 atmosphere and variable f O2 demonstrate that orthopyroxene dissolves to form olivine, Si-rich melt and clinopyroxene. These ...
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(1997)Ni-Fe pyroaurite-type hydroxychlorides were prepared by aerial oxidation of Ni(II)-Fe(II) hydroxides precipitated in aqueous solution with various P = Fe/Ni ratios. When P≥ 1/3, Ni(II)-Fe(II)-Fe(III) hydroxychlorides ...
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(1999)Slip nucleation during earthquakes is apparently analogous to rupture nucleation within an intact rock sample subjected to triaxial loading. The observations indicate that both these nucleation processes initiate within a ...
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(2006)Pyramid Mountain is a subglacial volcano in Wells Gray Provincial Park in east-central British Columbia. Landslides deform the north and east flanks of the volcano. Field strength testing and rock mass classification ...
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(2004)Organic sulfur in marine sediment is 34S enriched relative to the co-existing pyrite. This phenomenon is still enigmatic. Timing of the sulfur incorporation, immobilization and different sulfur species involved are part ...
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(2005)We determined the association of uranium in yeast cells S. cerevisiae grown in medium containing high (1 g · L-1) or low (0.2 g · L-1) concentrations of phosphate after exposure for 96 h to a 4 × 10-4 mol · L-1 U(VI) ...
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(2004)Petrographic, mineralogical and chemical analysis of naturally weathered equilibrated ordinary chondrites collected from ‘ hot’ deserts and Antarctica has revealed striking similarities and also pronounced differences in ...
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MECHANISMS RESPONSIBLE FOR THE INCREASE IN THE TAXONOMIC DIVERSITY IN THE PHANEROZOIC MARINE BIOTA (2002)Taxonomic diversity dynamics traditionally interpreted using exponential or logistic models of diversification, both of which are based on the assumption that the rate of origination (and sometimes also the rate of extinction) ...
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(2004)Data obtained from the low-elevation Khibiny Mountains (ca. 67–68°N; 33–34°E) on the Kola Peninsula, northwest Russia, indicate a period of exceptionally warm and dry conditions commenced at ca. AD 600 and was most pronounced ...
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MEDIEVAL LEAD MAKING ON MONT-LOZèRE MASSIF (CÉVENNES-FRANCE): TRACING ORE SOURCES USING PB ISOTOPES (2006)This study aims to document the origin of metallurgical activities on the Mont-Lozère Massif (Cévennes Mountains, South of Massif Central, France), which is the largest medieval site of Pb-Ag metallurgical activities in ...
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(2005)This paper presents results obtained in 1980-2002 from studies of various aspects of earthquake prediction in relation to the development of a method of medium-term prediction from a set of criteria.
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(1998)A petrographic-microprobe study of large, metal-poor, igneous-textured objects in Julesberg (L3) and other ordinary chondrites suggests that they can be classified into two petrographic types: megachondrules and large ...
Now showing items 10872-10891 of 43490