Том 32, 4, 2013 |
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Tran Tuan Dung, Bui Cong Que, Nguyen Hong Phuon. Cenozoic basement structure in the South China Sea and adjacent areas by modeling and interpreting gravity data 3 V.I. Isaev, Nguyen Huu Bin. Caviations in oil reservoirs crystalline basement from logging of the White Tiger field 14 A.V. Koloskov, S.A. Khubunaya. New data on the petrology of volcanic rocks from the Chichinautzin area: sources of magmatic melts and the origin of the Trans-Mexican Volcanic Belt (TMVB) 24 G.M. Vovna, M.A. Mishkin. Magmatic protolithes of granulites of nimnyrsky block (Aldan Shield) and their petrogenesis 40 M.V. Goroshko, G.Z. Gilmanova. Lithological and structural conditions of location of ore deposits of the Meso-Neoproterozoic Uchur-Maya depression (Siberian Platform) 52 A.V. Kudymov. Structure-forming processes in the north-eastern zone of the Kolumbinsky fault (the Northern Sikhote-Alin) 68 A.A. Cherepanov, N.V. Berdnikov. Mineralogical-geochemical properties of graphite and precise metal mineralization of the Soyuznoe deposit 80 L.P. Plyusnina, T.G. Shumilova, S.I. Isaenko, G.G. Likhoidov, A.V. Ruslan. Graphite of the Turgenevsky-Tamginsky deposits (Lesozavodsk area, Primorye) 88 I.А. Tarasenko, A.V. Zinkov. Specific features of present-day chemical composition of ground-water in coal-bearing districts of Sakhalin Island 100 Z.G. Mirzekhanova, N.A. Narbut. Ecological foundations for town territories organization by the example of Khabarovsk 111 Review V.Yu. Zabrodin. On a new edition of the Geologhical Glossary 121 Tran Tuan Dung, Bui Cong Que, Nguyen Hong Phuon Cenozoic basement structure of the South China Sea and adjacent areas by modeling and interpreting gravity data The South China Sea and adjacent areas is a large region with diversely complicated geological conditions. In spite of investigations carried out over the past many years, the marine geological structure in many places has remained poorly understood because of the deficient data, a thick seawater layer as well as of the sensitive areas among the countries in the region. In this paper, the authors study and apply a model-based methodology of the modeling and interpretation of the newest gravity data and others, which are 3D modeling, frequency filtering, horizontal gravity gradient and maximum horizontal gravity gradient, in order to determine clearly the basement structure. The basement features such as the main faults systems, uplift-depression zones and seafloor spreading axis, oceanic boundary in the region have been defined. The achieved results are checked by the seismic data available for the region. From the studied results, the authors have brought out some initial remarks on the structure and form of the basement in the South China Sea and adjacent areas. Key words: Basement structure; South China Sea; marine gravity data; basement fault; seafloor spreading axis; oceanic crust. V.I. Isaev, Nguyen Huu Bin Caviations in oil reservoirs of crystalline basement from logging of the White Tiger field, Vietnam Methods and results of logging of the oil reservoirs in the crystalline basement of the White Tiger field have been described. Based on the data of the 46 wells penetrated the basement of the Central arch, the values and regularities of the changes in the general and secondary caviations. Key words: basement, logging, oil reservoirs, porosity, White Tiger field, Vietnam. A.V. Koloskov, S.A. Khubunaya New data on the petrology of volcanic rocks from the Chichinautzin area: sources of magmatic melts and the origin of the Trans-Mexican Volcanic Belt (TMVB) New petrographic, isotope-geochemical and mineralogical data on the volcanic rocks of the Chichinautzin area (the Trans-Mexican Volcanic Belt) are presented. A comparative analysis was carried out aimed at identification of the geological position and composition of volcanics from different regions of the belt and plume-related volcanic rocks from California and Galapagos hotspot. It has been concluded that the Californian plume participates in the origin of the intraplate-type rocks from the Western Mexican Volcanic Belt, whereas the Galapagossky plume takes part in the same type of rocks from the Eastern Belt. Raising mantle plumes, in turn, provoke the melting of the lithospheric subcontinental mantle. As a result, the origin of the island arc rock type is mainly associated with the magmas. The model of the gradual propagation rift opening from west to east supported by Marquez et al., 1999; Verma, 2001, alternatively to a subduction model, to a larger extent corresponds to geological and geophysical data and to isotope-geochemical features of TMVB reported in this article. Key words: petrochemistry, geochemistry, isotopy, Trans-Mexican Volcanic Belt (TMVB), plumes reservoir. G.M. Vovna, M.A. Mishkin Magmatic protolithes of granulites of nimnyrsky block (Aldan Shield) and their petrogenesis The study of the regularities of distribution of the main petrogenic elements of admixtures showed that the magmatic protoliths of the most ancient stratified granulitic Nimnyrsky complex of the Aldan shield are represented by volcanites of the calc-alkaline and komatiite-tholeiite series. The initial volcanites of the calc-alkaline series contain basalts (two-pyroxene shales), andesites, and dacites (enderbites). Topology of the multi-element diagram of hypersthene plagiogneisses of the Nimnyrsky complex is similar to that of the Archean grey gneisses of the shield basement, showing the characteristic minima for Ta, Nb, P, Ti contents. The initial volcanites of the komatiite-tholeiite series are mainly tholeiitic basalts. The multi-element diagram demonstrates that the Nimnyrsky complex metatholeiites differ from the tholeiitic basalts of the N-MORB in higher Ba, La, Ce, and Sr contents. Nb/Y and Zr/Y ratios testify that the initial tholeiitic basalts of the Nimnyrsky complex had a plume source. Possible P-T parameters of the formation of the initial acid melts of hypersthene plagiogneisses of the Nimnyrsky complex have been calculated. Key words: metabasite-plagiogneiss association, metaandesites, metadacites, two-pyroxene shales, Nimnyrsky block, Aldan Shield. M.V. Goroshko, G.Z. Gilmanova
Lithological and structural conditions of location of ore deposits of the Meso-Neoproterozoic Uchur-Maya depression (Siberian platform) A set of sketch maps has been compiled including a tectonic sketch map of the Uchur-Maya depression, sketch maps of faults based on data interpretation of the digital elevation model processed by the modulus of the topography gradient for discriminating fault boundaries and, also, those of the lineament distribution and the density of elementary linear elements. On these sketch maps, locations of ore deposits and occurrences of various metals are plotted within the bounds of the Uchur-Maya depression. Structural and lithological factors that control ore occurrences have been established. The locations of ore objects with respect to faults of different orientation, the lineament network based on the data of the digital elevation model processing and the density of linear elements have been analyzed. The most important lithological factors that control the ore deposits are the pre-Mesozoic structural-stratigraphic unconformity zones, the contact zones of Mesoproterozoic Formations with contrasting physical and chemical properties and the high-porosity (cavernous) dolomite members in Yudomian Series of the Vendian. Key words: Mezo-Neoproterozoic, stratigraphy, tectonics, magmatism, metallogeny, digital evelation models, structural and lithological ore control, Uchur-Maya depression, Aldan-Stanovoy Shield. A.V. Kudymov
Structure forming processes in the north-eastern zone of the Kolumbinsky fault (the Northern Sikhote-Alin) The dominant sinistral strike-slip movement along the Kolumbinsky fault was recognized through the reconstruction of stress fields as well as using the method of belts in distributing orientations of slickensides and dyke-hosting faults. This movement was triggered by the regional-scale SES-NWN-oriented compression. Migmatites of the Eastern Sikhote-Alin volcano-plutonic belt are considered as formations synchronous with the regional displacement. In line with V.P. Utkin, they are inferred to be of rifting strike-slip and pull-apart nature. Based on the structural and tectonic position of volcanic rocks and accompanying intrusions as well as other general geological data, several stages of dislocation are recognized in the postaccretionary history of the Kolumbinsky fault and the area under consideration. At the end of these stages, the predominant strike-slip motion along the fault and feathering it displacements were replaced by synchronous transpressional and normal faulting. Key words: stress fields, sinistral strike-slip movement, the Kolumbinsky fault, the Northern Sikhote-Alin, the Far East of Russia. A.A. Cherepanov, N.V. Berdnikov Mineralogical and geochemical properties of graphite and precise metal mineralization of the Soyuznoe deposit Physical and chemical properties of graphite of the Soyuznoe deposit (JAR, Far East of Russia) have been studied. It is shown that the graphite is mainly fine-crystalline with a scale size less than 0.1mm. The most valuable large-scaled graphite contents are 13-14% at the average relative to the all up weight. Graphitic shales of the deposit are easily enriched by using standard technologies and their raw materials quality can be turned to wide industrial use. The predictive resources of the graphitic ores are evaluated as 2-3 bil t enabling to ascribe the Soyuznoe deposit to the largest graphite deposits in the world. The graphitic shales are marked by the presence of precise metal impurities in the form of microimpurities in the shales and graphite at the nanolevel. The total platinoid and gold contents can be estimated at 1-1.5 g/t. However, specific ways of the precise metal isolation require the elaboration of specific techniques of ore enrichment. Key words: graphitic shales, precise metal mineralization, Soyuznoe graphite deposit, graphite, Far East Russia. L.P. Plyusnina, T.G. Shumilova, S.I. Isaenko, G.G. Likhoidov, A.V. Ruslan Graphites of the Turgenevsky-Tamginsky deposits (Lesozavodsk area, Primorye) Regional carbonization in the Riphean metamorphic complexes of the northern Khanka terrane has been studied for the Tamginsky and Turgenevsky graphite deposits. A close relationship between noble metals mineralization and regional graphitization has been revealed. To learn the structural state of graphite isotopic, X-ray, thermal analytical methods and Raman spectroscopy have been used. As a result, two graphite varieties were recognized. The first one presents nanocrystalline graphite, generated by gaseous condensation of ore-bearing reduced deep (endogenic) fluids. The second is macrocrystalline graphite formed during metamorphic recrystallisation of carbon-bearing terrigenous rocks. The metamorphic processes were followed by granitization of sedimentary protolite, mobilization and transportation of carbonaceous and ore matter of host rocks. Polygenic nature of graphite closely connected with the noble metal mineralization has been determined. An amorphous diamond-like carbon matter was revealed in close association with the first generation of graphite. This unexpected finding may contain genetic information useful for geological and geochemical reconstructions. Key words: noble metals, graphite, carbonization, Raman spectra, Khanka terrane, Primorye. I.А. Tarasenko, A.V. Zinkov Specific features of present-day chemical composition of ground-water in coal-bearing districts of Sakhalin Island The paper discusses the specific features of the present-day chemical composition of underground waters in coal-bearing districts of Sakhalin Island. It was established that the processes, occurring in the underground hydrosphere in response to flooding of the coal mines, are accompanied by an increase in the dissolved matter concentrations and change of the underground water composition. A strictly specified complex of the secondary solid and liquid formations is produced. Temporal fluctuations of the underground water compositions of the anthropogenic horizons dont cause the principal change of the geochemical water type. The mine water composition doesnt depend on the type of hydrogeological structures and coal metamorphism, but is governed by hydrogeological parameters and primarily by the time of water-rock interaction. Key words: ground waters, abandoned mines, hydrochemistry, formation conditions, equilibrium, Sakhalin Island. Z.G. Mirzekhanova, N.A. Narbut Ecological foundations for town territories organization by the example of Khabarovsk The authors describe ecological planning of a big city as an essential component of territory organization in the urban development strategy. The terms territory organization and ecological planning are concretely defined. The principles of the urban territory ecological organization are developed and its specifics are revealed. A cartographic model of the Khabarovsk ecological carcass is presented as the result and model of a such kind of urban planning. Key words: ecological planning, ecological carcass of a territory, ecological and functional zoning of a territory. |