Volume 29, 2, 2010 |
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Ye.P. Maximov, V.I. Uyutov, V.M. Nikitin. The Central Aldan gold-uranium ore magmatogenic system (Aldan-Stanovoy shield, Russia) 3 V.A. Ignatova. Comparison of geodynamic models and oil-and-gas potential of the Russian Far East and SE Asian basins 27 V.S. Vishnevskaya. The problems of radiolarian-based determination of the age of the Jurassic-Cretaceous siliceous rocks from accretionary complexes of the Russian East 43 T.A. Yemelyanova, Ye.P. Lelikov. Miocene-Pleistocene volcanism of deep-sea basins of the Sea of Japan and Sea of Okhotsk 57 M.I. Kopylov. The role of electrochemical barriers in localization if mineralization, and their implications for mineral deposit prospecting (as exemplified by Priamurye deposits) 69 T.D. Leonova, O.V. Belous, I.I. Tenitskiy. The formation of the Tugur Bay bottom relief (Sea of Okhotsk) 81 N.V. Berdnikov, N.S. Konovalova, V.Ye. Zazulina. The investigation of precious metal inclusions in highly carboniferous rocks by the SEM and X-ray spectrum analysis (XRSA) method 90 V.A. Chudaeva, O.V. Chudaev. REE behavior in conditions of different type water mixing (Kunashir Island, the Kuriles) 97 V.P. Shesterkin. The change of the chemical composition of river waters in the Khabarovsk water node 112 Z.G. Mirzekhanova. The specific character of regional ecological policy in the prospective development strategy of the Khabarovsk Territory 119 Obituaries Sergey А. Shcheka (1937–2009) 126 Ye.P. Maximov, V.I. Uyutov, V.M. Nikitin The Central Aldan gold-uranium ore magmatogenic system (Aldan-Stanovoy shield, Russia) The Central Aldan ore district (CAOD) is considered as an integral ore-forming magmatogenic system (IOMS) which is a complex of different-rank ore-forming systems. In the epicenter of the IOMS there is the key (head) magma conduit marked on the erosion truncation by the West Elkon magmatic area. The logical radial position of the main ore-bearing zones with respect to the IOMS epicenter is considered as an indication of their relation to the head magma conduit. There are distinguished daughter ore-forming systems of the I-order – the Elkon (EOS), Kuranakh (KOS), and Tommot (TOS), and also ore systems of a higher order. Ore zoning is observed in the EOS and KOS, and is outlined in the TOS, which involves the change of the direction of gold or molybdenum (EOS) mineralization by gold-uranium mineralization toward the head magma conduit. The ore bodies are the derivatives of magmatic reservoirs (chambers) located at different levels of the staged magmatogenic system. The main gold and uranium supplier is the widely manifested potassic metasomatosis. The CAOD is treated as a superproductive district promising for revealing new large ore deposits and is suggested as a priority object for large-scale exploration for gold and uranium. Key words: gold, uranium, deposit, ore district, magmatogenic system, Aldan-Stanovoy shield of Russia. AV.A. Ignatova Comparison of geodynamic models and oil-and-gas potential of the Russian Far East and SE Asian basins A brief description is given of tectonic structure and Mesozoic-Cenozoic geodynamic evolution of the Asian continental margin. Based on the geodynamic evolution analysis, three large groups of oil-and-gas bearing and promising for oil and gas basins were distinguished: 1) of continental paleorifts and above-rift depressions, 2) of passive continental paleomargins, 3) of active continental margins, island arcs, and margin seas. The first two groups were formed owing to divergence of lithosphere plates; and the third group, at the expense of their convergence. The structure, history of formation, and oil-and-gas potential of the basins of each group are observed. A comparison is made between the basins of Russia and SE Asia. Despite the sizeable predominance of the scale of oil-and-gas potential of SE Asia due to its relation to the central zone of sedimentary basins at the crossing of different type continental margins, a conclusion is made of possible increase in the resources density in the Russian Far East given expansion of exploration work. Key words: oil-and-gas potential, sedimentary basins, geodynamics, paleomargins, plate tectonics, Russian Far East, SE Asia. V.S. Vishnevskaya The problems of radiolarian-based determination of the age of the Jurassic-Cretaceous siliceous rocks from accretionary complexes of the Russian East Radiolarians, which are the only faunal group in jaspers and cherts, arethe best instrument for defining the geologic age of the Jurassic-Cretaceous volcanogenic-siliceous rock sequences of the Russian Pacific margin, since they meet all requirements for orthostratigraphic groups: a quick change of complexes in time, vertical completion of geologic section, and they are characterized by wide geographic distribution of the complexes. The choice of biostratigraphic scales for age determinations of radiolarian complexes is important in principle. The correlation of the Tethyan radiolarian complexes and the Pacific ones involves great problems similar to those attending correlation of Tethyan and Boreal ammonite standards. The existing discrepancies are explained by different time of existence of some marking species, since the characteristic species of a certain zonal complex only determine the stratigraphic volume of the zone within its geographic distribution, and their stratigraphic distribution in the other paleobiogeographic areas and provinces can be different. The program of scientific investigations should involve prospecting and detailed analysis of the Jurassic-Cretaceous sections of Russia holding in the same layers radiolarians, buchii and ammonites, which will allow us to not only start generating a single scale for transition sections but also outline the road to biostratigraphic correlation of Tethyan and Pacific complexes. Key words: radiolarians, Mesozoic, biostratigraphic scales, NE Russia. T.A. Yemelyanova, Ye.P. Lelikov Miocene-Pleistocene volcanism of deep-sea basins of the Sea of Japan and Sea of Okhotsk The paper offers the results of petrographic and geochemical research into the Miocene-Pleistocene volcanic rocks, which attended the formation of the basins of the Sea of Japan and Sea of Okhotsk. The geochemical types of these rocks, the geodynamic conditions of their formation and their relation to different magmatic sources were determined. The marginal sea basaltoids of the Sea of Japan are the product of the fluid-enriched mantle (FEM). The Kurile Basin volcanics are the product of the continental crust-enriched mantle (CCEM). Despite the different conditions of rock genesis, common geochemical features were specified, namely, calc-alkaline “signs” These “signs” of the influence of the sialic crust on magma generation testify to formation of the basins of both seas on the continental basement. Key words: petrography, geochemistry, volcanism, marginal-sea spreading, Middle Miocene-Pleistocene, basins, Sea of Japan and Sea of Okhotsk. M.I. Kopylov The role of electrochemical barriers in localization if mineralization, and their implications for mineral deposit prospecting (as exemplified by Priamurye deposits) The physical-and-chemical features of the nature of electric fields and electrochemical barriers of Priamurye are described. The filtration and diffusive- adsorption electrochemical barriers are characterized, which influence the process of redistribution of ore components. The study of natural electrochemical barrier phenomena makes it possible to improve the geophysical methods of ore deposit prospecting. Key words: electric fields, electrochemical barriers of ore deposition, deposits, Komsomolsk, Khingan, tin ore and gold ore districts. T.D. Leonova, O.V. Belous, I.I. Tenitskiy The formation of the Tugur Bay bottom relief (Sea of Okhotsk) The factors influencing the formation of the bottom relief of Tugur Bay are revealed. The influence of the cold Sea of Okhotsk, the duration of freezing, the weakened wave mode, and strong tidal currents are the basic conditions of the modern relief formation of the bay. Several geomorphological zones are distinguished, which are characterized. Key words: bottom relief, tidal currents, geomorphological zones, Tugur Bay, Sea of Okhotsk. N.V. Berdnikov, N.S. Konovalova, V.Ye. Zazulina The investigation of precious metal inclusions in highly carboniferous rocks by the SEM and X-ray spectrum analysis (XRSA) method The results of special-purpose investigations of the information value of the REM-XRSA method in the study of inclusions enriched in PGE and gold in the highly carboniferous rock matrix are presented. As exemplified by black schists of the Kimkan and Sutyr rock sequences of the Bureya massif in the Russian Far East, REM-XRSA is shown to be an effective instrument for the prospecting and study of such inclusions. The method yields correct estimates of their chemical composition. Its specific feature is the presence of substantial amount of admixtures, including oxygen and carbon. Key words: scanning electron microscopy, precious metals, black schists, Russian Far East. V.A. Chudaeva, O.V. Chudaev REE behavior in conditions of different type waters mixing (Kunashir Island, the Kuriles) REE fractionation in natural acid waters as well as their mixture with fresh waters and seawaters in the unique environment of Kunashir Island (Kislaya R.and Lesnaya R.) are described. It is established that REE contents and their fractionation in the study waters are different and depend on a group of factors. Dissolved REE concentrations show significant enrichment in heavy REE. It is the result of high heavy REE contents in thermal waters which are discharged into the Kislaya River, and sorption of light REE by suspended matters. Suspended REE concentrations support this conclusion. In the process of mixing of two different chemical types of waters (Kislaya and Lesnaya rivers), precipitation of REE together with Fe, Al, Mn oxides takes place. The mixing of acid and sea waters leads to precipitation of over 80% of REE under salinity of up to 80/00. Key words: REE, lanthanoids, migration forms, fractionation, Kunashir Island, the Kuriles. V.P. Shesterkin The change of the chemical composition of river waters in the Khabarovsk water node The changes of the chemical composition of surface waters near Khabarovsk are described for the period of 1896-2008. Seasonal changes of the Amur and Ussuri waters chemical composition are shown. Hydrochemical characteristics of the Kazakevicheva, Pryamaya and Amurskaya flow channels are presented. Concentrations of the main ions, biogenic and organic substances are found to depend on the location of maximal water runoff in the Amur basin. The impact of economic activities in the Middle Amur on the dissolved matter content in the Amur and Ussuri rivers near Khabarovsk and the distribution of these substance concentrations across the Amur and the Amurskaya flow channel are described. The mineralization value of the Amur water in the winter low water period for 50 years of regular observations has decreased by 1.5 times, and organic matter content for this period has increased by 2 times. Key words: water chemical composition, the Amur river, the Ussuri river, Far East of Russia. Z.G. Mirzekhanova The specific character of regional ecological policy in the prospective development strategy of the Khabarovsk Territory Within the framework of prospective development of the Khabarovsk Territory outlined in the State Program “The Far East and the Transbaikal Region”, the specific character and significance of organization of regional ecological policy in line with the construction plans are shown. The conditions and principles of improvement of the territorial organization of economy in the new political and economic situation are defined. Key words: regional ecological policy, ecological planning, development strategy, territorial-branch structure of economy, Khabarovsk Territory, Far East. |