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 4256-4275 of 21934
-
(1988)Magnetic fractions separated from four deep sea sediments from the Pacific Ocean were analysed for elemental abundances and isotopic ratios of noble gases by stepwise heating. A ratio of (1.8 ± 0.4) × 10−4 was observed in ...
-
(2001)The relationship between the K-Ar dates of mixed natural clays and the ratios of detrital and diagenetic components follows in most cases a linear trend, which agrees with the theory when the K2O contents of the end-members ...
-
(2000)The based membrane extraction of Th4+ and Yb3+ was studied in HBTMPP-heptane using a hollow fibber membrane. The separation method of Th4+ and Yb3+ was proposed by kinetics competition. The separation operation of Th4+ and ...
-
(1999)The geoid, an equipotential surface of Earth's gravity field, reflects the distribution of mass within the planet and hence a variety of geodynamic processes. Because these data are dominated by sublithospheric processes, ...
-
(1989)Recently, there is a significant interest in prospecting for and developing non-traditional types of hydrocarbon resources, as petroleum bitumens, gas hydrates, oil shales, and ozokerite. Significant reserves of such ...
-
(1995)An atomic absorption method (graphite furnace) has been developed for the determination of 0.01--100 μg g-1 As, Sb, Se and Te in rocks, minerals and ores. It is based on extractive preconcentration of these elements by a ...
-
(2002)We use time series analysis to compare the impact histories of the Earth and Moon with the record of mantle plume activity. We use events with errors in their ages of =<150 Ma. The terrestrial and lunar impact records, ...
-
(1999)The Palaeoproterozoic positive excursion of δ 13Ccarb is now considered as three positive shifts of δ 13Ccarb separated by returns to 0‰, which all occurred between 2.40 and 2.06 Ma. This isotopic event is unique in terms ...
-
(2002)Magma-derived fluids are important in geologic processes (e.g., metal sequestration and ore deposition) but are intrinsically transient. Samples of magmatic fluids represented by fluid inclusions in a single zoned quartz ...
-
(1999)Djerfisherite [K6(Cu,Fe,Ni)25S26Cl] has been found as a daughter mineral in melt inclusions in melilite from a Kugda melilitolite. The inclusion mineral assemblage includes pyrrhotite, pentlandite, forsterite, diopside, ...
-
(1998)The viscosities of a series of water-bearing peralkaline rhyolitic melts have been experimentally determined. The dry melt compositions are composed of a series of additions of Na2O to a metaluminous base composition. The ...
-
(2002)We describe a phenocryst in a CO-chondrite type-II chondrule that we infer to have formed by melting an amoeboid olivine aggregate (AOA). This magnesian olivine phenocryst has an extremely 16O-rich composition Δ17O (=δ17O ...
-
EXTRINSIC AND INTRINSIC MODE OF HYDROGEN OCCURENCE IN NATURAL OLIVINES: FTIR AND TEM INVESTIGATION (2001)Olivine crystals from two mantle nodules in kimberlites (pipe Udachnaya and pipe Obnazennaya, Yakutiya, Siberia) were investigated using EMP, TEM, AEM and FTIR techniques to determine the mode of hydrogen occurrence in ...
-
(2004)3D numerical studies have shown that the vertical voltage above the Baikal deep-water fault is detectable and that respective transfer functions, Ez-responses, are sensitive to the electrical resistivity changes of the ...
-
(2004)In an early attempt to incorporate infraspecific, varietal categories into conventional, morphodescriptive Linnaean taxonomy, Quenstedt in 1845 introduced an idiosyncratic trinominal nomenclature that has bedevilled ammonite ...
-
(2002)Polycrystals undergoing ductile deformation develop lattice-preferred orientation (fabric) as a result of intracrystalline slip. A consequence of fabric development is that bulk physical properties become anisotropic. ...
-
(2002)A practical and reliable method for the preparation of fine-grained forsterite and forsterite-enstatite polycrystals, in the system MgO-SiO2s described. The method employs state-of-the-art techniques from materials science, ...
-
(1999)Detailed analysis of the crystal structures of minerals and inorganic compounds containing oxocentred [OCu 4 ] tetrahedra reveals the following principle for relationships between oxocentred tetrahedra and tetrahedral ...
-
(1996)Neoproterozoic–Cambrian rocks of the Zavkhan Basin (Govi-Altay, western Mongolia) comprise large-scale alternations of siliciclastic- and carbonate-dominated units (cf. ‘Grand Cycles’). Analysis of such depositional sequences ...
Now showing items 4256-4275 of 21934