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Browsing ELibrary by Title
Now showing items 3013-3032 of 21934
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(2002)We report for the first time experimental evidence for the nucleation and growth of diamonds from carbonatitic melts by reduction in reactions with silicon metal or silicon carbide. Experiments were carried out in the ...
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(2004)Experimental results are presented on the etching of diamond crystals in a system including silicate minerals from mantle xenoliths and C-O-H fluid at 5.5-6.0 GPa and 1450-1500°C. Slight etching patterns were established ...
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(2000)Diamond-bearing kimberlite fields accounts for about 15% of the total number of kimberlite fields of the Siberian Craton (SC). Diamond-bearing kimberlites are invariably located above the high density rock masses identified ...
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DIAMOND-FORMING MEDIA IN THE SYSTEM ECLOGITE-CARBONATITE-SULFIDE-CARBON: EXPERIMENTS AT 6.0-8.5 GPA (2004)Processes of diamond crystallization were experimentally studied in the model system eclogite-carbonatite-sulfide-carbon at pressures of 6.0-8.5 GPa. Diamond was synthesized for the first time in the sulfide-carbon and the ...
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(1994)We have investigated eight diamond-bearing bimineralic eclogite xenoliths from the Udachnaya Mine, Yakutia, Siberia, in terms of major elements, , and oxygen isotopic ratios. The β18O-values, measured with the new ...
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(1993)Major-element and REE compositions of 14 diamondiferous eclogites from the Udachnaya kimberlite in Yakutia, Siberia have been determined by electron microprobe and secondary ion mass spectrometer (SIMS). Based on previous ...
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(1997)Diamonds were found in impact melt rocks and breccias at the Popigai impact structure in Siberia. The diamonds preserve the crystallographic habit and twinning of graphites in the preimpact target rocks, from which they ...
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(1995)One consequence of partial melting of the lower crust by heat transfer from a mantle-derived underplate is that the resultant buoyant, felsic magma layer (density ρ2, viscosity μ2, thickness h2) will overlie a denser mafic ...
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(2003)The lower Paleogene sequence in the Middle Povolzhie (Ulyanovsk-Saratov syncline) of Russia is dominated by a terrigenous-rich siliceous facies with abundant and well-preserved siliceous plankton. Calcareous microfossils ...
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(1993)Low paleolatitudes are very frequent in Eocene to Oligocene formations, particularly in the Tethyan mobile belt. These anomalies and their possible sources are discussed. They are neither due to unreliable results nor to ...
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(2004)In recent years, it has become popular to attribute faunal change and mass extinction to impacts, volcanic eruptions, or climatic change. How well do these supposed causes compare to the excellent record of Cenozoic life, ...
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(1997)The potential role of large earthquakes on the excitation of the Earth's free wobble has been the subject of various investigations. It is nowadays recognized that the coseismic moment released by large earthquakes is not ...
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(2005)Diel (24-h) changes in concentrations of rare earth elements (REE) were investigated in Fisher Creek, a mountain stream in Montana that receives acid mine drainage in its headwaters. Three simultaneous 24-h samplings were ...
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(2001)A physiochemical model for the complex dielectric response of sedimentary rocks is used to invert broadband dielectric spectra for effective grain size distributions. The complex dielectric response of each grain within ...
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(2000)The dielectric behavior of kaolinite, montmorillonite, allophane, and imogolite samples ad-justed to a water potential of 33 kPa was examined using a time-domain reflectometry method over a wide frequency range of 103-10 ...
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(2004)DIFFaX simulations show that the 3R1 and 3R2 polytypes of hydrotalcites (HT) have distinctly different X-ray powder diffraction (XRPD) patterns. The HT samples obtained by coprecipitation as well as those subjected to a ...
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(2005)Carbonate-intercalated layered double hydroxides of Co(II) and Ni(II) with Fe(III) and Al(III) were precipitated under different conditions (pH = 8-12; T= 25-80°C). All the samples are replete with stacking faults which ...
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(2003)The quartz-water reaction SiO2 + 2H2O = H 4SiO40 is usually described by the following rate law: dm/dt = kd(S/M)(1 - m/meq , where m and meq are the real and equilibrium concentrations of silica in the solution, t is the ...
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(2003)Elastic moduli are controlled mainly by the viscoelastic and microplastic behavior of rocks if stress and strain remain below the proportionality limit. Differences between measured static and dynamic elastic moduli are ...
Now showing items 3013-3032 of 21934