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Browsing Геология России by Title
Now showing items 3809-3828 of 39126
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(1999)Although it is accepted that most natural diamonds crystallized from silicate melts, and P-T conditions of their formation are estimated to be 900-1500°C and 50-60 kbar, no diamonds have been synthesized at such 'low' ...
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(2002)Crystallization of diamond and graphite from the carbon component of magnesite, upon its decarbonation in reactions with coesite and enstatite at pressures of 6–7 GPa and temperatures of 1350–1800 ° C has been accomplished ...
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(2001)A compilation of more than 1200 δ13C–N data from well-characterised diamonds show a correlation of the maximum diamond nitrogen content (i.e. a limit sector) with δ13C over the full diamond δ13C range (i.e. more than 30‰). ...
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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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(PANGAEA, 2010-06-08)
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(PANGAEA, 2003-12-21)Diatom assemblages in 62 surface sediment samples from the outer Ob and Yenisei estuaries and the adjacent inner Kara Sea shelf were examined in relation to environmental conditions. Concentrations of diatoms reflect the ...
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(PANGAEA, 2014-03-12)In order to map the modern distribution of diatoms and to establish a reliable reference data set for paleoenvironmental reconstruction in the northern North Pacific, a new data set including the relative abundance of ...
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(PANGAEA, 2019-01-11)Lake Baikal has been experiencing limnological changes from recent atmospheric warming since the 1950s, with rising lake water temperatures, reduced ice cover duration and reduced lake surface-water mixing due to stronger ...
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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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(PANGAEA, 2003-01-21)Diatom assemblages were employed to study temporal changes of Siberian river runoff on the Laptev Sea shelf. Using a correlation between freshwater diatoms (%) in core-top sediments and summer surface water salinities from ...
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(PANGAEA, 2000-03-09)
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(PANGAEA, 2004-09-14)The present investigation was targeted at diatom composition studies in the surface sediments (0-1 cm) sampled in the Sea of Okhotsk and the northwest Pacific in the depth range from 130 to 6110 m. The taxonomic analysis, ...
Now showing items 3809-3828 of 39126