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Late Mesozoic topographic evolution of western Transbaikalia:Evidence for rapid geodynamic changes from the Mongol-Okhotsk collision to widespread rifting

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Geoscience Frontiers 2020年第5期11卷 1695-1709页

作者： A.V.Arzhannikova E.I.Demonterova M.Jolivet S.G.Arzhannikov E.A.Mikheeva A.V.Ivanov V.B.Khubanov L.A.Pavlova Institute of the Earth’s Crust Russian Academy of SciencesSiberian BranchIrkutskRussia Laboratoire Geosciences Rennes CNRS-UMR6118Universite de RennesRennesFrance Geological Institute Russian Academy of SciencesSiberian BranchUlan-UdeRussia A.P.Vinogradov Institute of Geochemistry Siberian Branch of the Russian Academy of SciencesIrkutskRussia

The Mesozoic geodynamic evolution of Transbaikalia has been largely controlled by the scissors-like closure of the Mongol-Okhotsk Ocean that separated Siberia from Mongolia-North China *** the oceanic closure,the tectonic evolution of that region was characterized by collisional uplift and subsequent extension that gave rise to the formation of metamorphic core *** complex tectonic setting prevailed simultaneously between 150 Ma and 110 Ma both in Transbaikalia,North Mongolia,and within the North China *** paleobotanical and paleontological data show that the oldest Mesozoic basins had formed in western Transbaikalia before the estimated age of extension *** no precise geochronological age is available for the onset of extension in *** Tugnuy Basin,as probably the oldest Mesozoic basin in western Transbaikalia,is a key obj ect to date the onset of extension and following changes in tectonic *** this study,U-Pb(LA-ICP-MS)dating of detrital zircons from three key Jurassic sediment formations of the Tugnuy Basin are used to identify the potential source areas of the sediments,understand the changes in sediment routing and provide insights on the topographic evolution of western *** results show several significant changes in tectonic regime after the closure of the Mongol-Okhotsk Ocean.A wide uplifted plateau formed during the closure of the Mongol-Okhotsk Ocean,determining the Early Jurassic drainage system reaching the AngaraVitim batholith to the north and shedding sediments to the continental margin to the *** following collisional event at the end of the Early Jurassic led to the uplift of the collision zone,which partially inverted the drainage system toward the North.A strike-slip displacement induced by the oblique collision initiated some of the early Transbaikalian depressions,such as the Tugnuy Basin at about 168 Ma.A phase of basin inversion,marked by folding and ero

关键词： U–Pb detrital zircons dating Topographic evolution Mongol–Okhotsk collision Transbaikalia

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Basic formation mechanisms of Lake Doroninskoye soda water, East Siberia, Russia

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Acta Geochimica 2018年第4期37卷 546-558页

作者： Svetlana V. Borzenko Leonid V. Zamana Larisa I. Usmanova Institute of Natural Resources Ecology and Cryology of Siberian Branch of Russian Academy of Sciences ChitaRussia 672049 Tomsk Department of the Trofimuk Institute of Petroleum-Gas Geology and Geophysics of siberian branch of the russian academy of Sciences Tomsk Russia 634050

The primary scientific goal of studying salt lakes is to better understand the formation of small continental- type hydrogeochemical systems. Many scientists have attributed the metamorphism of the chemical composition of salt lakes to the evaporative concentration of water. How- ever, the formation of soda water is inconsistent with this hypothesis. Thus, analyzing intrabasinal biochemical pro- cesses and water--rocks interactions during the evaporative concentration of water allows us to understand the major mechanisms of the formation and evolution of water com- positions. Therefore, the aim of this paper is to identify the key processes involved in the formation of the chemical composition of the water in Lake Doroninskoye. An analysis of the distribution of major components shows that Na＋, HCO3-, CO32-, and C1- are dominant in this water. High concentrations of these elements are the result of evaporative water concentration. Calcium, magnesium, and potassium are not accumulated because the water is saturated in min- erals containing these elements. The main barrier to the growth of the sulfate content of water is sulfate reduction. This process also contributes to the additional reproduction of carbon dioxide, which reacts with the products of the hydrolysis of aluminosilicates OH- to form HCO3- and CO32-, thus further contributing to the natural processes of soda formation.

关键词： Saline lake Sulfate reduction Thermodynamic equilibrium

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Comparison Analysis of Longitudinal Electrical Conductivity Distribution and Seismic Tomography Velocity Models for the Central Tien Shan Region

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Journal of Earth Science 2023年第2期34卷 580-587页

作者： Olga Zabinyakova Elena Bataleva Irina Medved Research Station of the russian academy of Sciences in Bishkek City Bishkek 720049Kyrgyzstan Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of SciencesNovosibirsk 630090Russia Trofimuk Institute of Petroleum Geology and Geophysics Siberian Branch of the Russian Academy of SciencesNovosibirsk 630090Russia

The paper is dedicated to consider the approach of longitudinal electrical conductivity maps construction for Central Tien Shan region and to complete the comparison analysis of these maps with related seismic tomography *** results of joint analysis of longitudinal electrical conductivity distribution and seismic tomography velocity models with respect to geological and geophysical senses allow to confirm the already known and to establish the new patterns of structure and geodynamics of the Tien Shan segment of Central Asia such as the manifestation of characteristic structural ensembles,reflection of the longitudinal and transverse segmentation of the Tien Shan,the existence within the framework of a“single”orogen of segments with different near-surface and deep structure and morphological *** well,the correlation between the velocity characteristics and geoelectric properties was *** correlation allows to identify signs of reflection of fault structures in geophysical fields and to clarify the territorial and structural position of both visible and hidden ***,in the paper,the geological interpretation of geophysical anomalies is considered.

关键词： profile magnetotelluric soundings longitudinal electrical conductivity map seismic tomography velocity model Tien Shan geophysics

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Calculation of Surface Energy of Metals and Alloys by theElectron Density Functional Method

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Journal of Materials Science & Technology 1998年第4期14卷 320-322页

作者： Kuznetsov, V.M. Kadyrov, R.I. Rudenskii, G.E. Institute of Strength Physics and Material Science Russian Academy of Sciences Siberian Branch Academicheskii av. 2/1 634048 Tomsk Russian Federation

The surface energy of (100), (110), (111) surfaces in Ni, Al and ordered alloys NiAl and Ni//3Al has been calculated within the framework of methodology based upon the electron density functional method. The results of calculations are in good agreement with the known for pure metals experimental data and in case of Ni//3Al alloy. There is also a good agreement with the results obtained by calculation using the embedded atom method. The investigation has been carried out in this work to show that the surface energy sigma of alloys can not be interpreted as an averaged concentration sigma of pure metals. For NiAl, the obtained results reveal considerable distinctions in anisotropy of sigma in comparison to the anisotropy of surface energy in pure metals. (Edited author abstract) 8 Refs.

关键词： Aluminum

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Hot Spot in Materials with Structural Defects under High Shear Loading Rates

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Journal of Materials Science & Technology 1998年第1期14卷 72-74页

作者： S. G.Psakhie K.P.Zolnikov and D. Yu.Saraev (Institute of Strength Physics and Materials Science, russian academy of Sciences, siberian branch,Akademicheskii pr.2/1, 634021 Tomsk, Russia) Institute of Strength Physics and Materials Science Russian Academy of Sciences Siberian Branch Akademicheskii pr.2/1 634021 Tomsk Russian Federation

The response of three-dimensional sample of Al, containing vacancy complex, under shear loading was simulated. The molecular dynamics method was used and interaction between atoms was described on the base of pseudopotential theory Solitary waves were generated in the sample under mechanical loading. Their interaction with the vacancy complexes was shown to be able to initiate hot spot in that local region of the complexes. Some parameters of the hot spot as well as solitary waves were calculated. The initiation of the hot spot is accompanied with sufficient local structural relaxation.

关键词： Rev Hot Spot in Materials with Structural Defects under High Shear Loading Rates

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Dissipation of Solitary Waves in Aluminum with Grain Boundary

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Journal of Materials Science & Technology 1998年第5期14卷 475-477页

作者： Psakhie, S.G. Zolnikov, K.P. Saraev, D.Yu. Institute of Strength Physics and Materials Science Russian Academy of Sciences Siberian Branch Akademicheskii pr.2/1 634021 Tomsk Russian Federation

The behavior of passing solitary waves through the region of grain boundary has been investigated on the basis of the molecular dynamics method. It has been shown that solitary waves initiated by compression and shear loading have a different interaction with the grain boundary region. The possibilities of using solitary waves for nondestructive testing of materials, in particular, for testing the quality of coatings, for testing of accumulation of microdamages, etc. have been noted. (Edited author abstract) 5 Refs.

关键词： Aluminum

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Simulating cyclotron-Bloch dynamics of a charged particle in a 2D lattice by means of cold atoms in driven quasi-lD optical lattices

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Frontiers of physics 2012年第1期7卷 3-7页

作者： Kolovsky, Andrey R. Kirensky Institute of Physics Siberian Branch of Russian Academy of Sciences Krasnoyarsk Russia Institute of Engineering Physics Siberian Federal University Krasnoyarsk Russia

Quantum dynamics of a charged particle in a two-dimensional （2D） lattice subject to magnetic and electric fields is a rather complicated interplay between cyclotron oscillations （the case of vanishing electric field） and Bloch oscillations （zero magnetic field）, details of which has not yet been com- pletely understood. In the present work we suggest to study this problem by using cold atoms in optical lattices. We introduce a one-dimensional （1D） model which can be easily realized in labora- tory experiments with quasi-lD optical lattices and show that this model captures many features of the cyclotron-Bloch dynamics of the quantum particle in 2D square lattices.

关键词： optical lattice Bloch dynamics cyclotron oscillations cold atoms

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Anomalies of bromine in the estuarine sediments as a signal of floods associated with typhoons

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Chinese Journal of Oceanology and Limnology 2015年第6期33卷 1489-1495页

作者： Ivan KALUGIN Anatolii ASTAKHOV Andrey DARIN Kirill AKSENTOV Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Science V.I.Il’ichev Pacific Oceanological Institute Far Eastern Branch Russian Academy of Science

X-ray fluorescence scanning with synchrotron radiation was performed to study sediment core records of floods in Amur Bay,Sea of *** of 3–8 mm with abnormally low bromine content were formed by the Razdolnaya River discharge to the central part of the bay during extreme floods,accompanied by severe storms at *** conditions in the region are typical for periods of deep tropical cyclones(typhoons),to which the distinguished interlayers were compared on the *** approach was made possible thanks to the high rate of sedimentation in the bay(3–5 mm/a) and low bioturbation of sediments under anoxic conditions.

关键词： X-ray fluorescence scanning typhoons sediments bromine continental shelf Sea of Japan Amur Bay

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Many-body Interatomic Potentials for Computer Simulation of Physical Processes in Metals and Alloys

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Journal of Materials Science & Technology 1998年第5期14卷 429-433页

作者： Kuznetsov, V.M. Rudenskii, G.E. Kadyrov, R.I. Kaminskii, P. Institute of Strength Physics and Material Science Russian Academy of Sciences Siberian Branch Academicheskii av. 2/1 634048 Tomsk Russian Federation

A model of binding forces in metals and alloys, based on the density functional theory and accounted effects of the many-body interactions, was proposed. The developed method can be easily applied for study of metals and alloys by the molecular dynamics simulation. The potentials of interatomic interactions have been found by the proposed method and applied for calculations of equation of state, elastic moduli and phonon dispersion in metals Ni, Al, and alloys NiAl, Ni//3Al. Results of the calculations are in good agreement with known experimental data both for pure metals and alloys. (Edited author abstract) 16 Refs.

关键词： Nickel

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Geophysical criterion of pre-outburst coal outsqueezing from the face space into the working

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International Journal of Mining Science and Technology 2019年第3期29卷 499-506页

作者： Alexander Shadrin Yuliya Diyuk Federal State Budget Scientific Institution The Federal Research Center of Coal and Coal Chemistry of Siberian Branch of the Russian Academy of Sciences

The initial process of coal and gas sudden outburst is studied in the article when under the influence of rock and gas pressure the part of a coal seam layer(a coal section)is squeezed out from the mouth of the future outburst cavity in a jump-like manner into the ***-mechanical criterion for a part of a coal seam layer outsqueezing in the form of the relation of active(squeezing out)and passive(preventing the outsqueezing)forces is defined in the *** on it,the geophysical criterion is defined by expressing basic physical parameters through geo-physical ones:the current stress is defined by spectral-acoustic method through the ratio of high frequency and low-frequency components of an acoustic signal,which is generated into a face working space by the mining equipment operating in the face;in-situ gas pressure is defined by gas analytical method by the concentration of methane in the atmosphere of the working;the strength of the most broken coal layer is defined by a strength measuring device(a device for measuring the depth of a steal cone punched into the coal by a spring mechanism).This paper studies the influence of acoustic,strength and filtrating and collecting properties of a face working space on the limit value of an obtained geophysical criterion of pre-outburst squeezing of a coal‘‘plug”out of the mouth of the future outburst cavity into the working.

关键词： Block-like structure Criterion of a coal section outsqueezing Spectral-acoustic method Stress condition Coal strength property In-situ gas pressure Aero and gas control equipment Methane concentration

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