Sulfur Compounds in Bottom Sediments of Fresh-Water Basins (Mouth of the Severnaya Dvina River and Rybinsk Water Reservoir)     

N. M. Kokryatskaya  I. I. Volkov  T. P. Demidova  T. S. Murzina 《Lithology and Mineral Resources》2003,38(6):552-563

Composition and distribution of different forms of sulfur in bottom sediments of the Severnaya Dvina River mouth and Rybinsk water reservoir are studied. The sediments are characterized by low accumulation rate of reduced sulfur compounds and high content of organic matter. Common features of the distribution of products of hydrogen sulfide in sediments of the river and water reservoir and the specificity of anthropogenic influence in each basin are established.  相似文献   

Photometric Evolution of the Orbital Light Curves of the Slow Nova V723 Cas     

Sergei Yu. Shugarov  Vitalij P. Goranskij  Nataly A. Katysheva  Anatolij V. Kusakin  Nataly V. Metlova  Igor M. Volkov  DrahomÍr Chochol  Theodor Pribulla  Eugenia A. Karitskaja  Alon Retter  Ohad Shemmer  Yiftah Lipkin 《Astrophysics and Space Science》2005,296(1-4):431-434

UBVRI photoelectric and CCD photometry of the slow nova V723 Cas obtained in the years 1995–2003 is presented. The evolution of light curves in 1-year intervals, folded with the orbital period 0.69326 days, shows an increase of the amplitude of the wave-like variations from 0.07 to 1.3 mag during the years 1997–2003. The fact that the shape and amplitude of the orbital light curves does not depend on wavelength is most probably related to the geometry of eclipses combined with the distribution of circumstellar matter in the system.  相似文献   

Formation conditions of high-grade tin-copper ores in the Churpun’ya deposit (Yakutia)     

A. V. Volkov  V. Yu. Prokof&#;ev  A. A. Sidorov 《Doklady Earth Sciences》2007,416(7):987-990

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Trace elements and evolution of granite melt as exemplified by the Raumid Pluton,Southern Pamirs     

Yu. A. Kostitsyn  V. N. Volkov  D. Z. Zhuravlev 《Geochemistry International》2007,45(10):971-982

New trace element data were obtained by ICP-MS for 58 samples representing eight intrusive phases of the Raumid granite Pluton. All of the rocks, except for one sample that was deliberately taken from a greisenized zone, were not affected by postmagmatic fluid alteration. The sequential accumulation of incompatible trace elements (Rb, Ta, Nb, Pb, U, and others) in the Raumid Pluton from the early to late phases coupled with a decrease in incompatible element contents (Sr, Eu, Ba, and others) indicates a genetic link between the granites of all phases via fractional crystallization of a granite melt. The REE distribution patterns of final granite phases are typical of rare-metal granites. The Ta content in the granites of phase 8 is only slightly lower than that of typical rare-metal granites. Greisenization disturbed the systematic variations in trace element distribution formed during the magmatic stage. The ranges of trace element contents (Rb, Sr, Ta, Nb, and others) and ratios (Rb/Sr, La/Lu, Eu/Eu*, and others) in the Raumid granite overlap almost entirely the ranges of granitic rocks of various compositions, from the least differentiated with ordinary trace element contents to rare-metal granites. This indicates that the geochemical signature of rare-metal granites can develop at the magmatic stage owing to fractional crystallization of melts, which is the case for the melt of the Raumid granite.  相似文献   

Relation between porphyry deposits and their vein satellites   总被引：1，自引：0，他引：1  

A. A. Sidorov  I. N. Tomson  N. E. Savva  A. V. Volkov  V. Yu. Prokof’ev  E. E. Kolova 《Doklady Earth Sciences》2006,409(2):859-863

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Apsidal motion in the eclipsing binary GG Ori     

I. M. Volkov  Kh. F. Khaliullin 《Astronomy Reports》2002,46(9):747-759

High-precision WBVR photoelectric observations of the eclipsing binary GG Ori (B9.5V+B9.5V), which has an eccentric orbit (e=0.22), were carried out in 1988–2001 at the Moscow and high-altitude Tian-Shan Observatories of the Sternberg Astronomical Institute. The aim of these observations was investigation of the apsidal motion of the system. Analysis of the resulting 12-year series of observations enabled us for the first time to accurately (to within 11%) measure the rate of rotation of the orbit $\dot \omega _{obs} = 0.046 \pm 0.005^\circ /yr$ and to appreciably improve estimates of the photometric and absolute parameters. The observed value of $\dot \omega _{obs}$ is 28% higher than the theoretical prediction of $\dot \omega _{th} = \dot \omega _{cl} + \dot \omega _{rel} = 0.036 \pm 0.001^\circ /yr$ . The relativistic part of the apsidal motion in this system $\dot \omega _{rel}$ is a factor of 2.5 greater than the classical term $\dot \omega _{cl}$ due to the tidal and rotational deformations of the components. The interstellar extinction in the direction of the star (at a distance of r=425 pc) is very large (A _v =1.75 ^m ). A number of recently published results (in particular, the conclusion that the components of this eclipsing binary are young) are confirmed.  相似文献   

Studying the mesoscale structure of inhomogeneities within the high-latitude stratosphere during the evolution of the circumpolar vortex on the basis of aircraft measurements     

G. N. Shur  V. V. Volkov  N. M. Sitnikov  A. E. Ulanovskii  V. I. Sitnikova 《Izvestiya Atmospheric and Oceanic Physics》2014,50(2):171-178

Mesoscale inhomogeneities in the fields of wind, temperature, and ozone concentrations have been studied on the basis of aircraft measurements performed within the international EUPLEX and RECONCILE projects in the northern polar region in the presence of the circumpolar vortex. Data have been obtained on the structure of turbulence inside and outside the circumpolar vortex. The zones of enhanced turbulence have been studied. The spectrum of coherence between ozone and wind velocity are found to have high values.  相似文献   

Mass spectrum of giant molecular clouds in a coagulation model     

E. V. Volkov  N. Ya. Sotnikova 《Astrophysics》1997,40(2):147-153

Solutions of Smoluchovski’ equation, describing merging processes in a system of giant molecular clouds, are investigated in detail. Both the case of a constant spatial gas density in the clouds and the case of a constant radial gas density are considered. It is shown that the solution of the coagulation equation is not expressed by a power law that is the same for the entire mass range under consideration. It is also demonstrated that the form of the solution depends on the width of the mass range of the clouds. A comparison with observations shows that the Oort model and the coagulation mechanism can describe the observed cloud mass spectrum quite adequately. Ways of improving the Oort model are suggested.  相似文献   

Features of the Ore Forming Process on the Dvoinoye Epithermal Au–Ag Deposit (Western Chukotka)     

E. E. Kolova  A. V. Volkov  N. E. Savva  V. Yu. Prokof’ev  A. A. Sidorov 《Doklady Earth Sciences》2018,478(2):166-170

The results of thermobaric geochemical study of ores of the Dvoinoye epithermal Au–Ag deposit are considered. Study of the fluid inclusions has shown that the ores were formed from low-salinity hydrothermal solutions with Na, Ka, and Mg chlorides and CO₂, HS^–, CH₄ trace fluxes at the time when the temperature dropped from 370 to 130°C. The results are compared with data obtained from the closely located Kupol and Sentyabr’skoye deposits.  相似文献   

New Data on the Geochemistry of Mississippi-Type Ores at the Sardana Deposit (Northeastern Russia)     

A. L. Galyamov  A. V. Volkov  K. Yu. Murashov  A. A. Sidorov 《Doklady Earth Sciences》2018,481(2):1029-1032

New data obtained using a modern analytical technique on the geochemistry and conditions of the formation of Mississippi-type ores at the Sardana deposit are presented. Comparative analysis related to other deposits of the same type was carried out. The geochemical data point to a considerable role of metamorphism of the enclosing carbonate–terrigenous masses in ore formation at the deposit.  相似文献