“Hot” particles of the Yenisei River: Radioisotope composition,structure, and behavior in natural conditions     

A. V. Chuguevskii  F. V. Sukhorukov  M. S. Mel’gunov  I. V. Makarova  A. T. Titov 《Doklady Earth Sciences》2010,430(1):51-53

The radioisotope compositions, structure, and behavior of “hot” particles under the natural conditions of the Yenisei River in the nearby influence zone of Krasnoyarsk mining and chemical combine were examined in this study. By the composition of gamma-radiating isotopes, all particles are divided into three groups: mono-isotopic, bi-isotopic and poly-isotopic. Mono-isotopic “hot” particles, containing only ⁶⁰Co were discovered for the first time. Transuranium elements (²⁴¹Am and ²⁴³Cm) were revealed in poly-isotopic particles. Investigation of poly-isotopic particles by means of a scan electron microscope showed that the presence of UO₂ together with the lack of activation of ¹⁵²Eu testifies to the reactor origin of this particle. Experiments showed that in natural conditions “hot” particles under the influence of filtrating water and moisture of pore solutions are gradually dissolved and radionuclides are repeatedly drawn into migration.  相似文献   

Stratigraphic chart of Cambrian deposits in the Turukhansk–Irkutsk–Olekma region,Siberian Platform     

N.V. Mel’nikov  Yu.Ya. Shabanov  O.S. Shabanova 《Russian Geology and Geophysics》2010,51(6):672-683

The former stratigraphic chart of the Cambrian in the Turukhansk–Irkutsk–Olekma region of the Siberian Platform was compiled in 1986 and approved in 1988. Large amounts of data were obtained from new wells drilled in the western and northern parts of the region during the preceding 20 years. Modifications necessitated by new data entail an indefinitely continuous series of revised facies zonation, recognition of new facies areas, regions and zone, as well as definition of a regional early Mayan stratigraphic hiatus. A new local stratigraphic division is the Olenchima Member (base of the Evenk Formation) underlain by a hiatus. The term Kochumdek Formation is no longer used in the Bakhta region and its lithologically distinct subformations (Yasenga, Moktakon, Mara, and Abakun) were raised to formation rank. The Olenchima Formation is no longer used in the Baikit zone; but instead, the Litvintsevo Formation was established here by correlation.  相似文献   

Mineralogy,Mossbauer Characteristics,and K-Ar Isotopic Age of Glauconite from the Lower Cambrian Sediments,Western Lithuania     

T. S. Zaitseva  I. M. Gorokhov  T. A. Ivanovskaya  B. B. Zvyagina  N. N. Mel’nikov  O. V. Yakovleva 《Lithology and Mineral Resources》2005,40(4):353-363

The paper presents results of lithological-mineralogical, Mossbauer, and isotope-geochronological study of globular phyllosilicates (glauconite and illite) from the Lower Cambrian Virbalis Formation in western Lithuania. K-Ar dates of these minerals (382 and 374 Ma) do not correspond to stratigraphic positions of the studied samples and indicate the loss of radiogenic ⁴⁰Ar, probably, in Middle Devonian. Simulation of cation distribution in the mineral structure and comparison of the obtained data with Mossbauer spectral characteristics suggest that loss of ⁴⁰Ar was caused by the structural rearrangement of globular phyllosilicates during the postdiagenetic substitution of Fe²⁺, Mg²⁺, and Fe³⁺ by Al³⁺, with the subsequent ordering of cation distribution in octahedral layers. These processes were presumably related to the same Caledonian tectonic events that were responsible for metasomatic dolomitization of Lower Paleozoic rocks in adjacent areas of the Baltic region at the terminal Silurian-Devonian. Diffraction analysis showed that globules consist of two micaceous phases with different Fe contents (illite and glauconite). Two alternative models are considered to explain the formation of two-phase globules: (1) disequilibrium conditions of diagenetic mineral formation; (2) transformation of glauconite into illite. Although the available data are insufficient to make an unambiguous choice between these models, the second mechanism seems to be more preferable.__________Translated from Litologiya i Poleznye Iskopaemye, No. 4, 2005, pp. 403–415.Original Russian Text Copyright © 2005 by Zaitseva, Gorokhov, Ivanovskaya, Zvyagina, Mel’nikov, Yakovleva.  相似文献   

Effect of the cryolithic zone electrical properties on the medium-frequency surface wave at high latitudes     

Yu. B. Bashkuev  V. P. Mel’chinov  M. G. Dembelov  L. Kh. Angarkhaeva  D. G. Buyanova  V. A. Borsoev 《Geomagnetism and Aeronomy》2006,46(4):507-516

Result of the measurements of the cryolithic zone electrical properties by the radio impedance sounding method are presented. The surface impedance and geoelectric section of the Arctic permafrost have been determined. The experiments have been performed near Cherskii in the continental zone. The surface wave attenuation function is considered. The accuracy of the surface wave field calculations at high latitudes has been estimated based on the local electrical characteristics of the underlying cryogenic medium. The effect of the Arctic Ocean on the operating zone of navigation and communication facilities in the kilometer wave band has been experimentally estimated.  相似文献   

Thermodynamic properties of the lithium mica polylithionite     

L. P. Ogorodova  I. A. Kiseleva  L. V. Mel’chakova  T. N. Shuriga 《Geochemistry International》2006,44(11):1151-1153

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Editorial     

Mel Friedman 《Tectonophysics》1984,101(3-4)

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Comprehensive Research of the Coastal Water Area of the Sea of Japan and Sea of Okhotsk under the Influence of River Runoff (Cruise 71 of the R/V <Emphasis Type="Italic">Professor Gagarinskii</Emphasis>)     

P. Ya. Tishchenko  V. B. Lobanov  V. M. Shul’kin  V. V. Mel’nikov  I. B. Tsoi  P. Yu. Semkin  P. P. Tishchenko  V. A. Bannov  O. V. Belous  L. E. Vasil’eva  O. A. Elovskaya  S. G. Sagalaev  Yu. V. Fedorets 《Oceanology》2018,58(2):325-327

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Numerical Instruments for the Analysis of Secular Dynamics of Exoplanetary Systems     

A. V. Mel’nikov 《Solar System Research》2018,52(5):417-425

A review is given of modern numerical methods for the analysis of resonant and chaotic dynamics: calculation of the Lyapunov characteristic exponents, the MEGNO method, and the maximum eccentricity method. These methods are used to construct stability diagrams for the planetary systems γ Cep, HD 196885, and HD 41004. The diagrams are analyzed to determine the most probable values taken by the orbital parameters of the exoplanets and obtain estimates for the Lyapunov time of their orbital dynamics. The stability diagrams constructed using the different methods are compared to analyze their effectiveness in the study of secular dynamics of exoplanetary systems.  相似文献   

Changes in Moskva R. runoff under anthropogenic impacts     

N. I. Koronkevich  K. S. Mel’nik 《Water Resources》2017,44(1):1-11

An algorithm has been proposed for assessing the hydrological role of the main anthropogenic factors governing the formation of Moskva R. runoff both separately and in total. The effect of landscape transformations, hydroengineering structures, and water use on the runoff in the Moskva R. basin has been analyzed for characteristic periods in the recent 150 years (the middle XIX century, the early XX century, 1960–1980, and the first decade of the XXI century, the period of calculation of the average long-term runoff). The main hydrological effect of urbanization in the Moskva R. basin on river runoff formation in recent decades has been demonstrated. The shares of the anthropogenic and climatic factors in the overall changes in Moskva R. runoff in the early XXI century have been evaluated.  相似文献   

Paleoseismological investigation of the Kichera Fault Zone in the northern Baikal region     

O. P. Smekalin  A. V. Chipizubov  V. S. Imaev  V. M. Besstrashnov  A. I. Mel’nikov 《Russian Journal of Pacific Geology》2007,1(2):176-185

In the recent structure of the Baikal Rift Zone, the Kichera Fault serves as the northwestern boundary of the Angara-Kichera aggradation depression. A seismotectonic scarp 60 m high was formed as a result of normal faulting during the late Pleistocene and Holocene. The erosion-aggradation and seismic landforms testify to the nonuniform growth of this scarp. To study the character of the seismic activity in the Kichera Fault Zone, we excavated two trenches across the seismotectonic scarp. The Holocene stage of the seismotectonic activation within the fault zone and the preceding period of relative quiescence were outlined from the character of the deformations in the trench sections and previous geomorphic investigations. According to our preliminary estimations, the active stage that started at the end of the late Pleistocene and that has remained incomplete until now was accompanied by at least three rupture-forming earthquakes.  相似文献