Geochemical evolution of deep fluids in the mantle lithosphere of the siberian craton during the Middle Paleozoic kimberlite cycle     

L. V. Solov’eva  T. A. Yasnygina  V. N. Korolyuk  K. N. Egorov 《Doklady Earth Sciences》2010,434(2):1330-1336

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Assessing Forecast Groundwater Resources in Usinskii Raion,Eastern Pechora Artesian Basin,with the Use of Hydrogeodynamic Modeling     

Egorov  T. S. 《Water Resources》2021,48(3):335-344

Water Resources - The current level of groundwater resources development has been evaluated for the territory of municipal unit, urban district Usinsk, Komi Republic, and the potential of an...  相似文献   

Two types of the surface pressure oscillations in the extra-tropical zone of the Northern Hemisphere depending on long-term variations of solar activity     

A. G. Egorov 《Russian Meteorology and Hydrology》2008,33(10):614-623

The increased solar cycle activity is followed by long-term anomalies in the surface air pressure that take place in the extra-tropical zone of the Northern Hemisphere in winter. The most important peculiarity is an opposite change in the pressure in the regions that tend to the Icelandic and Aleutian lows. During the 16th-23rd solar activity cycles, two scenarios of pressure change in the high latitudes are observed: (1) an increase at the border between the Arctic and Atlantic Ocean and a decrease at the border with the Pacific; (2) a decrease at the Arctic border with the Atlantic Ocean and an increase at its border with the Pacific. Spatial-temporal peculiarities of natural oscillations adapted to large-scale inhomogeneity in land and ocean distribution in the temperate and high latitudes and, therefore, the Arctic hydrometeorological conditions can be considered as important indicators of solar-terrestrial relations.  相似文献   

Electrical conductivity anomaly beneath mare serenitatis detected by Lunokhod 2 and Apollo 16 magnetometers     

L. L. Vanyan  T. A. Vnuchkova  I. V. Egorov  A. T. Basilevsky  E. G. Eroshenko  E. B. Fainberg  P. Dyal  W. D. Daily 《Earth, Moon, and Planets》1979,21(2):185-192

Magnetic fluctuations measured by the Lunokhod 2 magnetometer in the Bay Le Monnier are distinctly anisotropic when compared to simultaneous Apollo 16 magnetometer data measured 1100 km away in the Descartes highlands. This anisotropy can be explained by an anomalous electrical conductivity of the upper mantle beneath Mare Serenitatis. A model is presented of anomalously lower electrical conductivity beneath Serenitatis and the simultaneous magnetic data from the Lunokhod 2 site at the mare edge and the Apollo 16 site are compared to the numerically calculated model solutions. This comparison indicates that the anisotropic fluctuations can be modeled by a nonconducting layer in the lunar lithosphere which is 150 km thick beneath the highlands and 300 km thick beneath Mare Serenitatis. A decreased electrical conductivity in the upper mantle beneath the mare may be due to a lower temperature resulting from heat carried out the magma source regions to the surface during mare flooding.  相似文献   

Oil in the lake of world heritage   总被引：2，自引：0，他引：2  

O. M. Khlystov  A. G. Gorshkov  A. V. Egorov  T. I. Zemskaya  N. G. Granin  G. V. Kalmychkov  S. S. Vorob’eva  O. N. Pavlova  M. A. Yakup  M. M. Makarov  V. I. Moskvin  M. A. Grachev 《Doklady Earth Sciences》2007,415(1):682-685

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Compositional heterogeneity of the continental lithospheric mantle beneath the Early Precambrian and Phanerozoic structures: Evidence from mantle xenoliths in kimberlites and alkaline basalts     

V. A. Glebovitsky  L. P. Nikitina  A. K. Saltykova  N. O. Ovchinnikov  M. S. Babushkina  K. N. Egorov  I. V. Ashchepkov 《Geochemistry International》2007,45(11):1077-1102

Data on the petro- and geochemical characteristics of mantle xenoliths in kimberlites, which sampled the mantle beneath Early Precambrian tectonic structures (Archean cratons: the basement of the Eastern Siberian Platform, Karelian, Kaapvaal, Wyoming, Western Dharvar; Early and Middle Proterozoic foldbelts: Western Olenek, Natal, and Halls Creek), and xenoliths in alkaline basalts, which sampled the mantle benath Late Proterozoic-Phanerozoic structures (foldbelts: Central Asian, Mozambique, southern tip of South America, and Central German) indicate the following: (1) The major and trace element and REE composition of the mantle is different beneath Early Precambrian structures and Late Proterozoic-Phanerozoic foldbelts and reflects the degree of partial melting of the primitive mantle and its depletion in magmaphile components beneath ancient structures compared to young ones. (2) The original composition of the mantle was different beneath the Early Precambrian and Late Proterozoic structures in terms of both major oxides and incompatible trace elements and REE and their ratios; the composition of the mantle beneath the Eastern Siberian Platform, Wyoming, and Karelian cratons is different in terms of Zr/Y, La/Sm, Ce/Sm, Gd/Yb, and Lu/Hf. (3) The degree of melting of the primitive mantle decreases with depth, as follows from the negative correlation between the MgO/SiO₂ ratio and pressure (i.e., depth) and the positive correlation between the Al₂O₃/MgO ratio and pressure in the xenoliths. (4) The Y, Zr, Ti, Sm, Gd, and Yb conncentrations and the sum of HREE in the mantle decrease with increasing degree of melting; correspondingly, the material most strongly depleted in these incompatible trace elements and REE composes the upper levels of the lithospheric continental mantle.  相似文献   

The effect of screening of the magnetotelluric field by high resistivity layers: Three-dimensional numerical modeling constraints     

A. N. Kuznetsov  I. V. Egorov 《Izvestiya Physics of the Solid Earth》2006,42(2):161-166

A 3-D numerical modeling approach is applied to the effect of screening of the magnetotelluric (MT) field by high resistance (≥10⁶ Ω m²) layers, which up to now has mainly been studied in terms of 2-D heterogeneous models of geological sections [Berdichevsky and Yakovlev, 1990]. Three-layer models above a poorly conducting basement (ρ=10⁴ Ω m) are used. The resistance of the screening layer was generally taken equal to 2×10⁶ Ω m² and its thickness was varied from 200 to 2000 m. The resistivity of the host medium was set at 10 Ω m. Heterogeneities of a low and a high resistivity (ρ=10^?3 and 10⁴ Ω m, respectively) ranging in horizontal size from 4 to 40 km and having a height of 1–2.8 km (a protrusion on the basement) were examined. Based on calculations of these models, 2-D and 3-D screening effects were compared. The 3-D modeling determined values of model parameters at which the screening properties are preserved both in the case of a screen of limited horizontal dimensions and in the presence of a rupture in the screen comparable in horizontal size with the 3-D heterogeneity. As follows from the modeling results, the screening effect of the high resistivity model layers seriously complicates the use of MT soundings for the identification of a local heterogeneity of both a low and a high resistivity (ρ=10^?3 and 10⁴ Ω m, respectively) if its lateral size is smaller than the 4-km thickness of the studied three-layer section in question and its height is 1–1.5 km. The regular patterns of the screening effect revealed in this work are of interest in electromagnetic sounding applications.  相似文献   

Ice cover as a link in the ocean-atmosphere system     

K. L. Egorov  D. L. Laikhtman  V. M. Radikevich 《Boundary-Layer Meteorology》1974,6(1-2):169-182

The paper is a contribution to present knowledge of the system: atmosphere-ice-ocean. A theoretical model for investigation of the dynamics and thermodynamics of an ice-cover regime is suggested.Based on this physical model, a series of numerical experiments has been performed to define the influence of changing external conditions on the ice cover regime (variations of albedo and heat flux from water to the lower ice surface).  相似文献   

Vegetation pattern recognition using hyperspectral air sounding data     

V. V. Kozoderov  V. D. Egorov 《Izvestiya Atmospheric and Oceanic Physics》2011,47(9):1135-1142

For the problem of pattern recognition of natural and man-made objects using remote hyperspectral imaging data, we propose an approach that is based on both the criterion of a minimal Euclidean distance relative to spectra of some reference objects and specific features of wavelength shift of the area of transition from the chlorophyll absorption band to the spectral reflectivity maximum that is characteristic to vegetation. The database of this pattern-recognition method is constructed on the basis of pixel radiance histograms for particular spectral channels. The histogram in the maximum separability wavelength of object classes characteristic of the chosen test area is divided into a certain number of spectral intervals, which are grouped with respect to the above-mentioned shift. Using computational techniques for separating out these spectral groups, we point to new possibilities in the recognition of different vegetation types with the help of high-resolution spatial and spectral air sounding data.  相似文献   

The epithermal gold-silver mineralization in volcanic belts of Northeast Asia     

A. A. Sidorov  A. V. Volkov  V. N. Egorov 《Doklady Earth Sciences》2007,416(7):1032-1036

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