Geochemical Features of Carbonaceous Rocks on the Western Slope of the Southern Urals     

S. G. Kovalev  S. V. Michurin 《Lithology and Mineral Resources》2005,40(3):245-253

Based on the study of rocks in fault zones on the western slope of the southern Urals, it is shown that carbonaceous rocks are confined to the most dislocated parts of the sections and spatially associated with magmatic rocks. They are characterized by specific geochemical features with anomalous contents of gold and platinum group elements (PGE) and native tin mineralization that is atypical of terrigenous rocks. Transformation of these rocks is mainly governed by reduced mantle fluids penetrating into upper levels of the Earths crust at early stages of tectonomagmatic activation. The subsequent inversion of the fluids in the Earths crust leads to the formation of carbonaceous rocks with atypical mineralization and high PGE content.__________Translated from Litologiya i Poleznye Iskopaemye, No. 3, 2005, pp. 281–291.Original Russian Text Copyright © 2005 by Kovalev, Michurin.  相似文献   

The Nevelsk tsunami on August 2, 2007: Instrumental data and numerical modeling     

A. I. Zaitsev  D. P. Kovalev  A. A. Kurkin  B. W. Levin  E. N. Pelinovsky  A. G. Chernov  A. Yalciner 《Doklady Earth Sciences》2008,421(1):867-870

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Dark energy in the three-body problem: Wide triple galaxies     

N. V. Emel’yanov  M. Yu. Kovalev  A. D. Chernin 《Astronomy Reports》2016,60(4):397-409

The structure and evolution of triple galaxy systems in the presence of the cosmic dark-energy background is studied in the framework of the three-body problem. The dynamics of wide triple systems are determinedmainly by the competition between the mutual gravitational forces between the three bodies and the anti-gravity created by the dark-energy background. This problem can be solved via numerical integration of the equations of motion with initial conditions that admit various types of evolutionary behavior of the system. Such dynamical models show that the anti-gravity created by dark energy makes a triple system less tightly bound, thereby facilitating its decay, with a subsequent transition to motion of the bodies away from each other in an accelerating regime with a linear Hubble-law dependence of the velocity on distance. The coefficient of proportionality between the velocity and distance in this asymptotic relation corresponds to the universal value H_Λ = 61 km s^?1 Mpc^?1, which depends only on the dark-energy density. The similarity of this relation to the large-scale recession of galaxies indicates that double and triple galaxies represent elementary dynamical cells realizing the overall behavior of a system dominated by dark energy on their own scale, independent of their masses and dimensions.  相似文献   

First findings of siegenite (CoNi2S4) in picritic and picrodoleritic complexes of the Southern Urals     

S. G. Kovalev  V. N. Puchkov  S. S. Kovalev 《Doklady Earth Sciences》2014,457(1):796-802

This work presents data on the sulfide mineralization of picritic and picrodoleritic complexes of the western slope of the Southern Urals. The first finding of siegenite is described in igneous mafic-ultramafic rocks. The problems of the genesis of sulfides are reviewed with regard to the origin of igneous bodies. It is concluded that Co specialization of sulfides is caused by the formation of magma under the melting of the mantle substrate during the Riphean-Vendian plume origination and rifting.  相似文献   

Small-scale high-temperature structures in flare regions     

V. A. Kovalev  G. P. Chernov  I. Hanaoka 《Astronomy Letters》2001,27(4):267-275

When analyzing YOHKOH/SXT, HXT (soft and hard X-ray) images of solar flares against the background of plasma with a temperature T?6 MK, we detected localized (with minimum observed sizes of ≈2000 km) high-temperature structures (HTSs) with T≈(20–50) MK with a complex spatial-temporal dynamics. Quasi-stationary, stable HTSs form a chain of hot cores that encircles the flare region and coincides with the magnetic loop. No structures are seen in the emission measure. We reached conclusions about the reduced heat conductivity (a factor of ～10³ lower than the classical isotropic one) and high thermal insulation of HTSs. The flare plasma becomes collisionless in the hottest HTSs (T>20 MK). We confirm the previously investigated idea of spatial heat localization in the solar atmosphere in the form of HTSs during flare heating with a volume nonlocalized source. Based on localized soliton solutions of a nonlinear heat conduction equation with a generalized flare-heating source of a potential form including radiative cooling, we discuss the nature of HTSs.  相似文献   

Registration of the Simushir and Nevelsk tsunamis in the port of Kholmsk     

P. D. Kovalev  G. V. Shevchenko  D. P. Kovalev  A. G. Chernov  D. Ye. Zolotukhin 《Russian Journal of Pacific Geology》2009,3(5):443-449

The November 16, 2006, Simushir and August 2, 2007, Nevelsk tsunami records obtained by bottom pressure gauges in Kholmsk Bay are analyzed. The dominant role of the zero mode of eigen oscillations in the bay during the the wave field formation is shown: in the initial record interval (for the remote tsunami source) and 1.5 h after the first wave (for the nearly tsunami). Numerical modeling showed that the longer waves propagated toward Kholmsk in the case of the Nevelsk earthquake and they did not generate eigen oscillations of the bay. These oscillations were generated 1.5 h later when the shorter waves reflected from the Primorye coast arrived.  相似文献   

Gold in the weathering crust at the Suzdal' deposit (Kazakhstan)     

Yu.A. Kalinin  K.R. Kovalev  E.A. Naumov  M.V. Kirillov 《Russian Geology and Geophysics》2009,50(3):174-187

A comparative analysis of morphology and geochemistry was made for gold from the primary ores and weathering crust of the Suzdal' gold deposit, Eastern Kazakhstan. The deposit is localized in Carboniferous carbonaceous-terrigenous strata and is of gold-sulfide type. Study of gold from primary ores showed that it occurs mainly in two species: free and so-called invisible. Free gold is crystallomorphic segregations and irregular-shaped grains up to tens of microns in size; it occurs in intergrowths with sulfides, quartz, carbonate, and mica-chlorite aggregate. Most of gold particles have a fineness of 930–980‰, with some grains showing wide variations in composition. Invisible gold (probably chemically combined) is present in fine-acicular arsenopyrite and, less frequently, pyrite.Being transported to the weathering crust, all this gold served as a source for “neogenic” gold of diverse morphologic forms. We recognized crystalline (isometric, prismatic, acicular, and tabular) particles and drusoid gold aggregates in the form of exotic intergrowths of crystallomorphic and sinter-shelly grains. The grains tend to coarsen from bottom to top of the weathering crust. Several generations of gold of different granulometric classes are observed. We have revealed seed and layer growth and dissolution structures in crystals of early generations overgrown with fine grains. All these gold varieties are associated with hypergene minerals. Most of this gold is of high fineness (on the average, 995‰). The hypergene gold particles are chemically homogeneous high-grade, without rims.The results of studies suggest that the high-grade hypergene gold formed in the weathering crust as a result of the dissolution of invisible gold of sulfides and its local redistribution and deposition in oxidizing media. This is also evidenced from the tendency of gold to coarsen from bottom to top of the weathering crust. A distinctive feature of secondary gold is well-expressed crystals and their great diversity.  相似文献   

New Data on the Sm–Nd Age of Picrites in the Lysogorsk Complex,Southern Urals     

Kovalev  S. G.  Maslov  A. V.  Kovalev  S. S.  Vysotskii  S. I. 《Doklady Earth Sciences》2019,488(1):1018-1021

Doklady Earth Sciences - This paper reports new data on the age of picrites in the Lysogorsk complex, which are common in the Taratash metamorphic complex (Bashkir Meganticlinorium, the western...  相似文献   

Attenuation of Gravity Waves in Fast Ice     

Levin  B. V.  Kovalev  P. D.  Kovalev  D. P.  Kirillov  K. V. 《Doklady Earth Sciences》2019,484(2):177-180

Doklady Earth Sciences - The attenuation coefficients of sea waves in ice in the coastal zone of the Sea of Okhotsk with periods from 4 to 30 s were estimated as a function of their wavelength...  相似文献   

Rare Th–Sc Minerals in Picrites of the Southern Urals and Their Genetic Value     

Kovalev  S. G.  Puchkov  V. N.  Kovalev  S. S.  Vysotsky  S. I. 《Doklady Earth Sciences》2019,484(2):138-141

Doklady Earth Sciences - The first data on the discovery of Th–Sc mineralization in the pyritic complexes of the Southern Urals are presented. The minerals of Th (thorite) and Sc-containing...  相似文献