Browsing ELibrary by Title
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- Browsing ELibrary by Title
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing ELibrary by Title
Now showing items 2488-2507 of 21768
-
(1996)Acanthite (Ag2S), calcite (CaCO3), covellite (CuS), galena (PbS), and sphalerite (ZnS) have been crystallized via the diffusion of H2S or CO2 through polyethylene into metal chloride, metal sulfate or metal nitrate solutions. ...
-
(2001)X-ray absorption and luminescence spectroscopies have been used to characterize the local structure and coordination of uranium(VI) species coprecipitated with calcite (CaCO3) from room-temperature aqueous solutions. ...
-
(1996)Cordierite can contain variable amounts of H2O and CO2, and the total amount and relative proportions of these volatiles reflect the environment in which the cordierite was formed. In this study, cordierite has been ...
-
(1996)Cordierite can contain variable amounts of H2O and CO2, and the total amount and relative proportions of these volatiles reflect the environment in which the cordierite was formed. In this study, cordierite has been ...
-
(2002)Cordierite H2O and CO2 volatile saturation surfaces derived from recent experimental studies are presented for P–T conditions relevant to high-grade metamorphism and used to evaluate fluid conditions attending partial ...
-
(2000)Polarized single-crystal Raman spectra at room temperature and 5 K and polarized infrared spectra at room temperature were obtained from four natural cordierites of different compositions in the wave number region of the ...
-
(2000)Cordierite has the ideal formula (Mg,Fe)2Al4Si5O18.x(H2O,CO2), but it must contain some Fe^3+ to account for its blue color and strong pleochroism. The site occupation and concentration of Fe^3+ in two Mg-rich natural ...
-
(2003)The local structural heterogeneity and energetic properties of 22 natural Mg–Fe cordierites, ideal formula (Mg,Fe)2Al4Si5O18·x(H2O,CO2), were investigated at length scales given by powder infrared spectroscopy (IR) and ...
-
(1996)We have analyzed metallic and silicate phases in the IVA iron meteorites and two related stony irons, Steinbach and Sao Joao Nepomuceno. Analyses of bulk metal phases in the two stony irons using INAA show that they plot ...
-
(2003)The mantles of the Earth and Moon are similarly depleted in V, Cr, and Mn relative to the concentrations of these elements in chondritic meteorites. The similar depletions have been used as evidence that the Moon inherited ...
-
(1999)The impact of various mixtures of CO2, H2O, H2, and CH4 upon Fe, Ni, Co, W. Ge, P, and Mo partitioning between silicate and metal alloy liquids was evaluated experimentally at 1400°C and 10 kb in graphite. The effects ...
-
(1993)A simple mechanism is put forward to explain the abundances of siderophile elements in the Earth's mantle. Within the frame of a homogeneous accretion hypothesis, the model involves repeated equilibrium fractionation, in ...
-
(2000)The siderophile element problem in mantle geochemistry has not been solved by treating the mantle as the residue of core formation in a closed system. Conventional solutions to the problem involve the addition of new ...
-
(2004)Core motion induced by lunisolar precession of the mantle is analysed and compared with experiments and Earth observations. First-order motion has the core axis lagging the mantle axis in precession by a small angle. This ...
-
(2002)This paper applies the relationship between the matrix multivariate covariance and the covariance of a linear combination of a single attribute to analyze modeling with nested structures. This analysis for modeling of ...
-
(1990)We have identified for the first time a specific sign of the existence of a definite 'biolithogenic character' of the material of bauxite, which allows realistic study and genetic testing of the different stages in the ...
-
(2001)Accurate relative noble gas abundances of mantle-derived melts are required in order to further understand the distribution of noble gases in the mantle and fractionation of noble gases during the melting process. Noble ...
-
(2002)The presence of common lead contamination in zircons used for U-Pb geochronology is a potentially serious source of error. Traditionally, common lead is measured by analysis of 204Pb, and the isotopic composition of lead ...
-
(2001)We present integrated relative production rates for cosmogenic nuclides in rock surfaces, which take into account reported variations of the geomagnetic field intensity during the past 800,000 yr. The calculations are based ...
-
(2003)A correction procedure is proposed to account for the effect of secondary X-ray fluorescence near grain boundaries in electron microprobe analysis. The procedure is based on the Monte Carlo simulation method, which is used ...
Now showing items 2488-2507 of 21768