Petrologic-geochemical evidence of geologic-genetic uniformity of gold hydrothermal deposits formed in black-shale and non-shale substratum

The problem of gold deposits origin lying in crystal and black-shale substratum is discussed. The expediency of comparative research of all geologic-real-genetic factors of their formation, among which a significant value is retained by the geochemical, is emphasized. The technique of geochemical researches, based on use of substratum petrologic studying results of golden-ore fields and their frame, providing formation of multilevel system of geochemical selection representing stage-by-stage history of rock formation and their geochemical shape at each stage, is offered.The results of the offered approach realization in golden-ore deposits of the North Transbaikalia lying in the crystal substratum and Proterozoic black-shale strata in the frame of the Muiskiy ledge of the Archean base of the Siberian craton are presented. The resulted materials prove in geochemical aspect the geologic-genetic uniformity of formed in non-shale and black-shale substratum of gold hydrothermal deposits, proved by the totality of empirical data. The offered technique provides formation of regional, and in the long termglobal banks, of correct geochemical dat

Mineral-petrochemical and geochemical features of ultrametamorphic process of the focus-dome type

Distribution of petrogeneous and oregeneous (Au, Ag, Hg) chemical elements in metamorphic zones of the Kedrovskiy focus-dome construction in Northern Transbaikalia is shown and discussed. The conclusion is drawn about absence of substance essential migration during local focus-dome ultrametamorphism

Femic chemical elements in near-ore metasomatic haloes of the Kedrovskoye gold-ore deposit (the North Transbaikalia)

The results of studying geochemistry of phemophilous group in near-ore apogneiss and aposhale metasomatites of the Kedrovskoye mesothermal deposit in the North Tranbaikalia are presented. According to mineralogy-petrochemical data it was defined that metasomatic haloes belong to beresite metasomatic formation with propylite-like profile of transformations at the area periphery. Silica loss up to the half of its mass from the back zones was stated in the initial ores and conditions of this loss were determined. Silica removed from the ores served as a basis for formation of gold-bearing quartz veins. In the back zones of near-ore metasomatic haloes contrast anomalies of phosphorous, titanium, magnesium, manganese, iron, potassium and calcium were found. Femic orientation of gold-bearing metasomatites demonstrates the generation of metal-bearing fluids in mantle magmatic chambers

Mineralogical petrochemical and geochemical features of near ore metasomatism in the gold ore deposit "Verkhne-Sakukanskoye" (Northern Transbaikal Region)

Discussion in comparative aspect of the nature of geochemical fields in the mesothermal gold deposits formed in blacks and a crystal substratum is continued. The relation of near vein metasomatic and geochemical auras for a case of intervein spaces of low gold-bearing quartz veins is shown on the example of the deposit «Verkhne-Sakukanskoye» of Northern Transbaikal Region located in southwest early Proterozoic frame of the Chara ledge of the Archean base - the western fragment of the Aldan board. In the first part of the article the geological structure of the deposit, mineral structure of ores are considered. On the basis of studying of mineral composition and structure of rocks with attraction of original chemical silicate analyses and petrochemical calculations the enclosing ore containing bodies of plutonic rocks of the early Proterozoic Kodarsky complex are diagnosed as hornblende - biotite quartz diorite and quartz monzonite. In the second part of the article for the first time a mineralogical - petrochemical zonation of near vein metasomatic auras is described, their belonging to a beresite metasomatic formation, and belonging of the deposit to the gold subformation of a gold - uranium - polymetallic beresite ore formation is proved. The geochemical materials revealing distribution on near Clarke levels of contents of ore genous elements (Au, Ag, Hg, etc.) in an intervein space is given, genetic connection of near vein geochemical auras with near vein metasomatic ones in frames of mesotermal ore-forming process of late Paleozoic epoch is substantiated. The obtained results are consistent with conclusions about structure and conditions of formation of the geochemical fields, made earlier in others mesothermal gold deposits of blacks and not slate types

Field-asymmetric transverse magnetoresistance in a nonmagnetic quantum-size structure

A new phenomenon is observed experimentally in a heavily doped asymmetric quantum-size structure in a magnetic field parallel to the quantum-well layers - a transverse magnetoresistance which is asymmetric in the field (there can even be a change in sign) and is observed in the case that the structure has a built-in lateral electric field. A model of the effect is proposed. The observed asymmetry of the magnetoresistance is attributed to an additional current contribution that arises under nonequilibrium conditions and that is linear in the gradient of the electrochemical potential and proportional to the parameter characterizing the asymmetry of the spectrum with respect to the quasimomentum.Comment: 10 pages, 5 figures. For correspondence, mail to [email protected]

Mineral-petrochemical wallrock alteration of rocks in Bericul gold-ore deposit (Kuznetsk Alatau)

The distribution of mineral associations in near-veined zonal propylite-beresite metasomatic columns of mesothermal Bericul gold-ore deposit was analyzed. However, the polymineral composition in the inner (axial and adjacent with it rear) zones is inconsistent to the existing metasomatic column theoretical model. According to Korzhinskii metasomatic zoning theory, implied monomineral (quartz) and binary-mineral (quartz, sericite) compositions are characteristic of axial and rear zones, respectively. In common with above-mentioned facts, the zoning formation of differential component mobility is influenced by two additional factors: counter diffusion of components from fractured fluids into pores and diffusion mechanism of mass transfer it's from pores fluids into fractured of rock-fluid systems

Physicochemical investigation of NiAl with small molybdenum additions

Specimens of four cast NiAl alloys, three of them containing 0.5, 1.0 and 1.5 at. % Mo., were homogenized for 10, 10, and 140 hr at 1373, 1523 and 1273 K, respectively, then kept at 1073, 1173 and 1323 K for 60, 120 and 3 hr, respectively, and quenched in icy water. The precipitation of a metastable Ni3Mo phase was observed at temperatures between 1073 and 1523 K. Molybdenum substituted for nickel was found to inhibit the lattice disordering in NiAl at 1073 and 1523 K

Statistical Multifragmentation Model within the Extended Morphological Thermodynamics Approach

On the basis of morphological thermodynamics we develop an exactly solvable version of statistical mutifragmentation model for the nuclear liquid-gas phase transition. It is shown that the hard-core repulsion between spherical nuclei generates only the bulk (volume), surface and curvature parts of the free energy of the nucleus, while the Gaussian curvature one does not appear in the derivation. The phase diagram of nuclear liquid-gas phase transition is studied for a truncated version of the developed model.Comment: Talk given at XIX Igor Sikorsky Kyiv Polytechnic Institute Conference "Theoretical and Practical Problems of Physics, Mathematics and Informatics" , May 13-14, 2021, Kyiv, Ukraine (4 pages, 2 figures

Model of Optimal Planning of Development of State Information Systems in the Face of Multicriteria and Uncertainty

Information technology has become an integral part of the activities of authorities. One of the main elements of the ecosystem of the digital economy, including the infrastructure of the electronic government of the Russian Federation, are federal and regional state information systems. Only in St. Petersburg, as in the subject of the Russian Federation, 68 GISs operate, a limited budget determines the need for their rational distribution, taking into account the importance, complexity, impact on other systems. This determines the need for planning the distribution of costs of the city budget for their creation, maintenance and modernization. The task of defining such a plan can be considered as a decision making task. The article considers the issue of developing a generalized mathematical model of optimal planning under conditions of multicriteria and uncertainty