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Browsing ELibrary by Title
Now showing items 3835-3854 of 21934
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(1999)Insoluble fluoride precipitates which form during HF digestion of mafic silicate rocks coprecipitate in their structures the trace elements such as Rb, Sr, Y, Cs, Ba, REE, Pb, Th and U, thus hindering their accurate ...
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(1989)This paper describes a method of analyzing the fine structure of seismic spectra recorded with bottom seismographs (BS). This technique can be used to evaluate the distortions of the signal spectrum introduced by the ...
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(1986)In the majority of cases, new auriferous deposits, including some which are unique, are being discovered in regions with, at the most, only a thin allochthonous (transported) cover and this trend is likely to continue. ...
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(2002)A stochastic channel embedded in a background facies is conditioned to data observed at wells. The background facies is a fixed rectangular box. The model parameters consist of geometric parameters that describe the shape, ...
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(2000)Mathematical modeling was used to study the growth of crustal magma chambers beneath volcanoes due to the melting of the surrounding rocks and the discharge of the molten material during volcanic eruptions. The sizes of ...
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(1989)The effect of the stress in a rock medium on the seismic velocity in it can be predicted from a model of the elastic medium that assumes it to be physically nonlinear. Thus, to define the stress state of the given point ...
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(1999)Sulfur isotopic analysis of the elemental sulfur reference material Soufre de Lacq, prepared as silver sulfide by chromous chloride reduction and as copper sulfide by sealed-tube synthesis, indicates that Soufre de Lacq ...
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(2003)A method to quantify the exchange of water between surface water channels and the groundwater aquifer based on the concept of reach transmissivity was evaluated for use under transient conditions and incorporated into a ...
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(2000)Volumes of various trap-magmatic facies have been evaluated by invoking deep-drilling data, geophysical data, field studies, and recent notions of the geodynamic settings of their formation at the Permo-Triassic boundary. ...
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(2004)Laboratory experiments proved that during loading of rock samples the migration of ultrasound signals (US) foci occurred in the volume of sample. There is distribution of US foci analysed in this paper. On the base of ...
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(1996)Kinetics of evaporation of forsterite in hydrogen gas was investigated by high temperature vacuum experiments in the pressure range plausible for the solar nebula. The evaporation rate at total pressure (Ptot) below 10-6 ...
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(1999)Evaporation rates of forsterite in the primordial solar nebula were modeled. There are 3 evaporation regimes expected: 1. free evaporation-dominated (FED) regime, where forsterite evaporates as free evaporation, 2. hydrogen ...
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(1999)Single crystals of forsterite were evaporated in a vacuum furnace at temperatures of 1500-1800°C to study evaporation kinetics, magnesium isotopic fractionation, and magnesium diffusion in forsterite. The evaporation of ...
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(1996)Synchronous occurrence of three large event borderlines at 1.100, 850, and 650 Ma in the Neoproterozoic is shown for the Siberian Platform in the northern part of the Central-Asian foldbelt and Chinese Platform. They ...
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(2001)In the history of the Kazanian sea basin in the Russian plate, periods of quasi-stationary shoreline position alternated with quick phases of transgressions and regressions. The last events were responsible for appearance ...
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(2003)The presence of event beds in the shallow-marine stratigraphic record indicates formation is governed by high magnitude-low frequency processes rather than low magnitude-high frequency processes. In this paper, a 2-D ...
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(2001)Petroleum-geochemical analyses of carbonaceous regionally metamorphosed rocks, carbonaceous rocks from ore deposits, and alkalic plutonic rocks from diverse settings, demonstrated the presence of very low to moderately low ...
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(2001)Upper Cambrian to Lower Ordovician radiolarites (alternations of ribbon-banded radiolarian cherts and siliceous shales) from Kazakhstan are dated accurately by means of conodonts. They represent the only known continuous ...
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(2002)In the seventeenth century, two tsunamis that were generated by earthquakes on the Kuril-Kamchatka subduction zone inundated the eastern coast of Hokkaido, northern Japan. Stratigraphic evidence for these two tsunamis and ...
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(1996)We present evidence from tungsten (W) isotopic measurements consistent with the presence of live 182Hf (T1 = 9 Ma) in the early solar system. This is based on the observation of a well-resolved deficit of about four parts ...
Now showing items 3835-3854 of 21934