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Browsing Геология России by Title
Now showing items 2975-2994 of 39126
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(2003)A geochemical, geochronological, and isotopic study of rocks from the Panozero pluton in central Karelia was carried out. It was shown that the rocks make up a common subalkaline plutonic series and vary in composition ...
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(1990)For complex natural bodies, which undoubtedly include plutons of autometasomatized rare-metal granite, one interpretation of the origin of all rare-metal minerals often cannot be regarded as satisfactory. To determine the ...
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(1999)A new phase isostructural with the minerals of the aenigmatite group Na2Mg41xFe Si61xO20 with x 5 0.25 2 0.5 was synthesized at 13-14 GPa with a split- 31 222x sphere anvil apparatus (USSA-2000). The structure (for x 5 ...
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(1988)This study of lithium micas has shown that the increase in number of occupied octahedral positions in them clearly depends on their lithium content. The sum of octahedral cations (Y) gradually increases from protolithionite, ...
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(1999)Individual chondrules, coarse and fine-grained metal, chondrule rims, and matrix samples were separated from the Renazzo chondrite (CR2) and studied by instrumental neutron activation analysis. Both Renazzo chondrule and ...
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(2003)Geological cooling histories modelled from apatite fission-track (FT) data are dependent upon extrapolated, laboratory-based track annealing data. Annealing in apatite appears to be compositionally controlled. This study ...
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(2003)Lake Khubsugul is a Cenozoic rift representing a structural element of the Baikal rift zone (BRZ), which extends some 1500 km from the Eastern Sayan in the southwest to the Kodar Ridge in the northwest. It consists of ...
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(2004)This study investigates the compositional characteristics, parageneses, and stability relations of some högbomite-bearing assemblages in coarse-grained corundum-garnet amphibolites from a blackwall zone that separates ...
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(2004)Ilmenite is one of the common kimberlitic indicator minerals recovered during diamond exploration, and its distinction from non-kimberlitic rock types is important. This is particularly true for regions where these minerals ...
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(2001)By extrapolating the lower mantle equation of state (EoS) to P=0, T=290 K, we determine the EoS parameters that are compatible with a mixture of (Mg, Fe)SiO3 perovskite (with a small admixture of Al2O3), (Mg, Fe)O ...
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(1997)Chemical compositions of eleven enstatite chondrites (1 EH5, 4 EH3, 3 EL3, 1 EL5, and 2 EL6) and their metal and nonmagnetic fractions determined by instrumental neutron activation analysis are reported. The abundances of ...
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(1987)In the sedimentary sequence of the Ustarasay-Brichmulla ore district there are three members that consist of alternating thin beds and differ in composition of their constituent rocks. Thus, the lower member is dominated ...
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(1994)The partitioning of U, Th, Pb, Sr, Zr and Ba between coexisting chromian diopsides and haplobasaltic liquids at oxygen fugacities between the iron-wüstite buffer and air at 1285°C has been characterized using secondary ion ...
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(2001)The compositional dependence of the intracrystalline cation distribution was investigated in four synthetic spinels belonging to binary solid solutions. Spinel single crystals were flux-grown in the (Mg,Zn)(Al,Fe3+)(2)O-4 ...
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(2001)The compressional (vP5) and shear (vS5) wave velocities of 20 glasses in the pseudoternary system anorthite (An)-diopside (Di)-forsterite (Fo) were measured by Brillouin spectroscopy as a means of constraining the effect ...
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(1996)The composition-dependence of the solubility of H2O in silicate melts along the binary joins NaAlSi3O8-KAlSi3O8, NaAlSi3O8-LiAlSi3O8, and KAlSi3O8-LiAlSi3O8 has been determined at 2 kbar and 1040°C. The study involved 1 ...
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(2001)Molar absorption coefficients (molar absorptivities) of the near infrared combination bands at 4500 and 5200 cm-1 assigned to OH groups and H2O molecules, respectively, were determined for glasses of dacitic, andesitic and ...
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(1998)The effects of composition on pyroxene-melt partitioning of several REE (rare earth elements), Y, and Sr were experimentally evaluated. Using the synthetic model systems anorthite–diopside, diopside–titanite and ...
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(1997)The effect of melt composition on the solubility of Ni in haplobasaltic melts was investigated at 1 atm via additions of SiO2 (Quartz), Mg2SiO4 (Forsterite), and Na2SiO3 (Na-metasilicate) to the 1 atm diopside-anorthite ...
Now showing items 2975-2994 of 39126