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1.
Krupskaya V. V. Andreeva I. A. Sergeeva E. I. Cherkashev G. A. 《Lithology and Mineral Resources》2002,37(2):130-137
The submarine Haakon Mosby mud volcano was studied in detail during several cruises, resulting in the collection of an abundant and diverse lithological material. Comprehensive field and laboratory studies made it possible to identify different types of sediments with specific granulometric and pelite fraction (<0.005 mm) compositions, as well as the regularity of their spatial distribution relative to various morphostructural zones of the mud volcano. 相似文献
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B. N. Ryzhenko N. I. Kovalenko N. I. Prisyagina N. P. Starshinova V. V. Krupskaya 《Geochemistry International》2008,46(4):328-339
The solubility of ZrO2(baddeleyite) in HCl, HF, H2SO4, NaOH, and Na2CO3 solutions was determined by the capsule method at 500°C and 1000 bar. Baddeleyite is the only solid phase detected in the experimental products. Based on the ZrO2(baddeleyite) solubility measurements, the values of equilibrium constants at 500°C and 1000 bar (consistent with the Gibbs free energies of all the reactants) were obtained for the following reactions: ZrO2(cr) + H2SO 4 0 = Zr(OH)2OH 4 0 (pKo = 4.95), ZrO2(cr) + 2H2SO 4 0 = Zr(SO4) 2 0 ) + 2H2O (pKo = 3.74), ZrO2(cr) + H2O + HF0 = Zr(OH)3F0 (pKo = 3.35), ZrO2(cr) + 2HF0 = Zr(OH)2F 2 0 (pKo = 2.37), and ZrO2(cr) + 2H2O + OH? = Zr(OH) 5 ? (pKo = 4.39). Ionization constants were estimated for the chloride, fluoride, sulfate, and hydroxo complexes of zirconium. Using the experimental data and thermodynamic information derived from experiments and the electrostatic model of the ionization of electrolytes, it was shown that no more than n mg zirconium per one kilogram H2O can be accumulated in high-temperature fluids at 500°C and 1000 bar. 相似文献
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Integrated geological and geophysical investigation of bottom sediments in the Medvezhii Island region, southwestern margin of the Barents Sea, has made it possible to characterize sediments of diverse types related to the action of hydrocarbon fluids, hemipelagic sedimentation, slope phenomena, and combined influence of all these factors. Relatively homogeneous (in terms of mechanical composition) sediments are subdivided into several lithogenetic types based on the grain size distribution. Relationships of clay minerals, as well as their morphological and structural peculiarities, are described for each type. It is demonstrated that sediments formed under the substantial influence of hydrocarbon fluid fluxes are characterized by a high (relative to hemipelagic sediments) content of smectites and mixed-layer clay minerals of the illite–smectite series. It is assumed that these minerals are authigenic formations in mud volcanic rocks and diapir material. Based on the comparison of clay minerals contents primary source of the material for redeposited sediments has been reconstructed. 相似文献
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Levitan M. A. Bourtman M. V. Demina L. L. Krupskaya V. V. Sedykh E. M. Chudetsky M. Yu. 《Lithology and Mineral Resources》2004,39(6):566-579
Two bottom sediment cores (BP00-23/7 and BP00-7/6) recovered from the Yenisei transect in the southern Kara Sea are described. Data on their grain size composition, clay and heavy mineral assemblages, and distribution of a large group of chemical elements are presented. Radiocarbon dates based on AMS C-14 method suggest the Holocene age of sediments in the cores. Literature data on physical properties and foraminifers have also been analyzed. The facies affiliation of the lithostratigraphic subdivisions has been unraveled. History of the Yenisei River runoff in the Holocene has been reconstructed on the basis of different indicators. 相似文献
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L. P. Ogorodova M. F. Vigasina E. A. Vlasov L. V. Mel’chakova V. V. Krupskaya E. M. Spiridonov 《Geochemistry International》2018,56(3):234-239
The paper reports data obtained in the course of a comprehensive physicochemical study of Li-tosudite, a mixed-layer mineral from hydrothermally altered rocks in western Chukotka, Russia, whose formula was reliably established. The enthalpy of formation of Li-tosudite from Chukotka, Ca0.15(Li0.9Mg0.2Al6.0)[Si6.4Al1.6O20](OH)10 · 3.3H2O, from elements was experimentally determined by melt solution calorimetry in a high-temperature Calvet microcalorimeter: ΔfH el o (298.15 К) =–15087 ± 26 kJ/mol. The standard entropy and Gibbs free energy of formation of this mineral were evaluated. 相似文献
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L. P. Ogorodova I. A. Kiseleva L. V. Melchakova M. F. Vigasina V. V. Krupskaya Yu. Yu. Bugel’skii 《Geochemistry International》2014,52(5):421-427
The results of thermochemical studies are reported for nontronite samples from the Pinares-de-Majari (Eastern Cuba) (Sample I) and Kempirsai serpentine massif (South Urals, Kazakhstan) (Sample II). The enthalpies of formation of dehydrated hydroxyl-bearing nontronites from elements were determined by melt dissolution calorimetry using high-temperature heat-flux Tiana-Calvet microcalorimeter: Δ f H el o (298.15 K): ?4958 ± 13 kJ/mol for Mg0.4(Fe 1.5 3+ Mg0.4Ni0.1)[Si3.7Al0.3O10](OH)2 (I) and ?5003.6 ± 8.0 kJ/mol for Mg0.3Na0.1Ca0.1(Fe 1.4 3+ Mg0.5Ni0.1)[Si3.7Al0.3O10](OH)2 (II). It was determined experimentally that the enthalpy of dehydration (removal of molecular adsorption and interlayer water) of the studied nontronites is 6 ± 2 kJ per 1 mole H2O. The enthalpy of formation of nontronite of theoretical composition Mg0.15Fe 2 3+ [Si3.7Al0.3]O10(OH)2 was estimated at ?4750 kJ/mol. The Gibbs free energies of formation of the nontronites were calculated. 相似文献
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V. N. Golubev I. V. Chernyshev A. V. Chugaev A. V. Eremina A. N. Baranova V. V. Krupskaya 《Geology of Ore Deposits》2013,55(6):399-410
The isotopic (U-Pb, 238U-235U, 234U-238U) and chemical study of whole-rock samples and finegrained fractions of rocks in a vertical section of the terrigenous sequence at the Dybryn uranium deposit in the Khiagda ore field shows that a wide U-Pb isotopic age range (26.9-6.5 Ma) is caused by oxidation and disturbance of the U-Pb isotopic system in combination with protracted uranium ore deposition. The oxidation of rocks resulted in the loss of uranium relative to lead and eventually to an overestimated 206Pb/238U age at sites with a low U content. The 238U/235U ratios in the studied samples are within the range of 137.74–137.88. Samples with a high uranium content are characterized by a decreasing 238U/235U ratio with a decrease in 207Pb/235U and 206Pb/238U ages. A nonequilibrium 234U/238U ratio in most studied samples furnishes evidence for young (<1.5 Ma) transformation of the Miocene uranium ore, which is responsible for uranium migration and its redeposition. 相似文献
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N.N. Puzyrev M.M. Mandelbaum S.V. Krylov B.P. Mishenkin G.V. Petrik G.V. Krupskaya 《Tectonophysics》1978,45(1):15-22
Abyssal variations beneath the Baikal rift zone are revealed in an irregular seismic stratification of the crust, the presence of an intracrust waveguide and by the vast (> 200,000 km2) underlying area of anomalously low velocity (Pn = 7.6−7.8 km/sec) uppermost mantle. In its abyssal structure the Baikal rift is heterogeneous along the strike, with sharp changes in crustal thickness (35–50 km).Comparison of first-arrival seismic-velocity curves and also the respective velocity columns reveals the essential similarity of upper-mantle seismic cross-sections for all continental rift zones. The anomalous upper layer of the mantle (ca. 7.7 km/sec) is relatively thin (15-13 km) and can be linked with the mantle waveguide only locally. 相似文献
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N.N. Puzyrev M.M. MandelBaum S.V. Krylov B.P. Mishenkin G.V. Krupskaya G.V. Petrick 《Tectonophysics》1973,20(1-4):85-95
The largest rift zone of Europe and Asia is located in the region of Lake Baikal. In 1968–1970 deep seismic measurements were carried out along a number of profiles with a total length of about 2000 km within the rift zone and in the adjacent parts of the Siberian platform and the region of the Baikal Mountains. These investigations were of a reconnaissance nature, and therefore the point sounding method was used.A low-velocity region for compressional waves (7.6–7.8 km/sec) has been found and could be traced over a large area in the upper parts of the mantle. The width of this anomalous zone is 200–400 km. The Baikal rift lies in its northwestern part. Within the studied part of the Siberian platform the thickness of the earth's crust is 37–39 km, while in the rift zone it is 36 km, and further to the southeast the crust-mantle boundary lies at a depth of 45–46 km. The Baikal rift proper is bounded in the northwest by a deep fracture zone and does not seem to be associated with any significant “root” or “antiroot” in the relief of the Mohorovi?i? discontinuity.The reduced compressional velocity in the upper parts of the mantle beneath the Baikal zone is considered to correspond to the same phenomena found under the mid-oceanic ridges and the extended rift system in the Basin and Range province of North America. The Baikal rift in the narrow sense of the word lies over the northwestern edge of the anomalous mantle region. This asymmetric position seems to be its main peculiarity. 相似文献