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Korovnikov I.V.,Russian Academy of Sciences | Shabanov Y.,Siberian Research Institute of Geology
Russian Geology and Geophysics | Year: 2016

A study of triobite distribution allowed a biostratigraphic subdivision of the Kuonamka Formation section exposed in the middle reaches of the Olenek River (18 km downstream of the village of Olenek). Through detailed description of the section, a biostratigraphic subdivision down to the level of biozones and faunal beds was performed. These are beds with Calodiscus-Triangulaspis annio, Delgadella ultima-Bergeroniellus expansus Zone, Lermontovia dzevanovskii-Neopagetina orbiculata Zone, Anabaraspis Zone, Cheiruroides arcticus- Pagetia horrida Zone, Kounamkites Zone, Triplagnostus gibbus Zone, and beds with Tomagnostus fissus-Paradoxides sacheri. These biostratigraphic subdivisions were correlated with regional zones of the Siberian Platform. The study also provides analysis of trilobite assemblages from the Lower/Middle Cambrian boundary interval, which was identified in the studied section and other previously described sections (Nekekit, Molodo, Boroulakh Rivers). In the studied section, the base of the Middle Cambrian is defined by the FAD of Cheiruroides arcticus, i.e., at the base of the Cheiruroides arcticus-Pagetia horrida Zone. This level correlates with a presumed lower boundary of Stage 5 of a new International Stratigraphic Chart for the Cambrian System. © 2015.


Rudnev S.N.,RAS Institute of Geology and Mineralogy | Babin G.A.,Siberian Research Institute of Geology | Kovach V.P.,Russian Academy of Sciences | Kiseleva V.,RAS Institute of Geology and Mineralogy | Serov P.A.,Russian Academy of Sciences
Russian Geology and Geophysics | Year: 2013

The structure, composition, and age of Vendian-Early Cambrian plagiogranitoid associations composing the Kshta and Taraskyr massifs of the Yenisei pluton in the Altai-North Sayan island-arc belt are considered. We have established that these associations formed within 550-520 Ma and differ in petrographic composition and sources. Two stages of island-arc plagiogranitoid magmatism are recognized: early (550-540 Ma, formation of plagiogranitoids of the Kshta (545 ± 8 Ma) and Taraskyr (545 ± 7 Ma) massifs) and late (525-520 Ma, formation of plagiogranitoids of the Maina complex of the Yenisei (524 ± 2 Ma) and Tabat plutons). By petrochemical composition and geochemical characteristics, the rocks of the Kshta massif are high-alumina plagiogranitoids similar to adakites. They might have been produced through the melting of metabasites compositionally similar to N-MORB in equilibrium with garnet-containing restite during the subduction of oceanic slab at ≥ 15 kbar. The rocks of the Taraskyr massif are low-alumina plagiogranites. They formed through the melting of metabasites located in the lower layers and(or) the basement of the island-arc system in equilibrium with plagioclase-containing restite at 3-8 kbar. The low-alumina plagiogranitoids of the Yenisei pluton melted out under the same conditions. Isotope-geochemical studies showed that the Vendian-Early Cambrian plagiogranitoids formed at the early stage are characterized by high positive ∑ Nd(T) values (7.5-4.9), Late Riphean model Nd-age (TNd(DM) = 0.64-0.98 Ga), and Sr isotope ratio varying from 0.7040 to 0.7053. These data point to the juvenile parental melts of the rocks and the varying content of ancient crustal material in the magma generation zone. © 2012.


Chernykh A.I.,Siberian Research Institute of Geology
12th International Multidisciplinary Scientific GeoConference and EXPO - Modern Management of Mine Producing, Geology and Environmental Protection, SGEM 2012 | Year: 2012

The article provides information on the nature of gold mineralization and conditions of distribution of gold mineralization on the territory of Southern Siberia. The article demonstrates that besides the well-known gold-quartz, gold-skarn, sulfide-polymetallic, and placer ore formational types there are prospects to discover the new ones for the region that will be attractive as an investment, that is gold-sulfide, gold-silver, goldporphyry, and gold-bearing crusts of weathering. The article gives brief description of predictable types of gold mineralization and the most promising ore clusters is given, as well as an expert evaluation of undiscovered potential resources of gold for different ore-formational types. © SGEM2012 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM Published by STEF92 Technology Ltd.


Pegel T.V.,Siberian Research Institute of Geology
Bulletin of Geosciences | Year: 2014

The Diringde reef complex (Kotuy River Basin, Southwest of the Anabar Region, northern Siberian Platform, Russia) has formed during the late mid-Cambrian-early Furongian at the shelf margin of the epicontinental marine basin. Two detached carbonate buildup complexes originated. The southern mid-Cambrian buildup complex is replaced laterally by shale-carbonate rocks of the open basin slope. The northern mid-Cambrian-Furongian buildup complex passes laterally into the inner shelf dolomites. The trilobite associations of the central parts of both buildup complexes consist of rare endemic polymerids, distributed mainly in interbeds between algal buildups. The trilobite associations in narrow facial transition zones (reef flanks) to surrounding stratified deposits differ in having more abundant polymerids, higher taxo-nomic diversity, and include also agnostoids. The trilobite associations are similar to the assemblage of the reef-dominated mid-Cambrian-Furongian Chukuka Formation that is widespread in the neighboring South Anabar Region. The associations from the reef flank of the southern buildup complex consist mainly of species distributed in Cambrian shallow-water deposits of the Saami, Sakha, Nganasany and Tavgi horizons in the Kulyumbe River reference section, northwestern Siberian Platform. The trilobite assemblages of deeper water deposits of the Eyra Formation that are found on the open marine side of the Diringde reef complex combine typical elements of mainly endemic, shallow-water associations of the southern buildups and the slope basin associations with various cosmopolitan pre-Furongian agnostoids enabling international correlations.


Mogutcheva N.K.,Siberian Research Institute of Geology
Stratigraphy and Geological Correlation | Year: 2014

The study of the large collections of plant remains gained from cores of numerous boreholes drilled in Western Siberia made it possible to determine the taxonomic composition of the Jurassic flora of this region, the stages of its evolution, and the sequence of floral assemblages, which characterize the regional stratigraphic horizons indirectly correlated via series of parallel faunal, microfaunal, spore and pollen zonal scales with a general stratigraphic scale. The compositions of floral assemblages was established in the Hettangian-lower part of the upper Pliensbachian, upper part of the upper Pliensbachian, lower Toarcian, upper Toarcian, Aalenian, Bajocian, Bathonian, and Callovian-Oxfordian sediments. Criteria were elaborated to substantiate the Triassic-Jurassic and Lower-Middle Jurassic boundaries. Lithologically and biostrati-graphically, the Middle-Upper Jurassic boundary is poorly expressed. © 2014, Pleiades Publishing, Ltd.


Stankevich L.S.,Siberian Research Institute of Geology
Galperin Readings 2012 - Innovative Technologies and Fundamental Research | Year: 2012

Seismic stratigraphy, as method of geological interpretation stack seismic sections is wide practical useful in order of Oil & Gas exploration. Negative side of this method is strong dependence between wave image of geological object and frequency features of seismic data. Those features are related with type and area condition of source, processing and etc. Another problem is consist in interference of refracted signals on the seismic traces. This problem can solved by the additional processing (inversion) of stack section. One of way is creating the impulse section from the ordinary section. This method of inversion is called Dynamic Compression (DC). DC is improving time definition of the seismic record and quality of litostratigraphic interpretation.


Chernykh A.I.,Siberian Research Institute of Geology
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM | Year: 2013

The South Siberia is located within the limits of mountain systems of the Altai, Kuznetsk-Alatau, Salair Ridge, Western and Eastern Sayany. It is one of the oldest gold ore regions of Russia. Apart from widespread gold-bearing placers there are numerous primary deposits of gold-quartz, gold-skarn and gold-bearing sulphide-polymetallic types. Gold ore potential of such primary deposits is largely worked out and the gold mineral-raw base build-up problem through other deposit types in the region is extremely urgent. Main prospects concerned with primary gold mineralization of the Southern Siberia are associated with a search for gold-sulfide, gold-silver, goldporphyry types of deposits and in gold-bearing weathering crusts. The article presents the characteristics of such promising types of gold mineralization in the region. The special distribution analysis of gold ore objects and their relationships with intrusive and stratified complexes allowed drawing the chart of the South Siberia metallogenic zonation for gold. The analysis of integrated geological, mineralogical and geochemical data demonstrates special features of different types of gold mineralization, conditions of its localization and prospecting indicators, structure and composition of forecasting gold ore fields (2200 tons). © SGEM2013 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM.


Melnik I.A.,Siberian Research Institute of Geology
Neftyanoe Khozyaistvo - Oil Industry | Year: 2013

The method of low-resistivity reservoirs detection on basis of re-interpretation of the results of standard methods of wells geophysical study is given. Comparison of the re-interpretation data with layers test results allowed to determine localization criteria of promising oil and gas saturated objects. The relation of the results of re-interpretation of materials of wells geophysical study with the results of seismic data processing is revealed. Structural criteria of tectonic stress-stable zones, promising in terms of oil and gas saturation, are determined.


Ivanova I.A.,Siberian Research Institute of Geology
Russian Geology and Geophysics | Year: 2016

The results of study of geochemistry of the Neoproterozoic and Lower Cambrian deposits within the Berezovka depression are presented. A mudstone member of the Seralakh Formation is assumed to be an oil source bed. We compiled a series of geochemical maps for this formation and estimated the hydrocarbon generation potential and the scales of oil and gas formation in its mudstone member, using the volumetric-genetic method. The migrated liquid hydrocarbons amount to about 8 billion tons. © 2016


Chernykh A.I.,Siberian Research Institute of Geology
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM | Year: 2014

The Altai-Sayany folded region is characterized by a long history of exploration and mining of gold. Here several metallogenic zones and clusters of gold mineralization are distinguished, varying in formation conditions and age. Based on analysis of the isotope-geochronological, geological and metallogenic data one can distinguish five metallogenic epochs in the formation of gold ore potential within the Altai-Sayany folded region. The gold mineralization of Permian-Triassic age is the least studied within the Altai-Sayany region. The Permian-Triassic age of gold mineralization is determined in those areas, where the gold mineralization is superimposed on a relatively young rocks of Late Paleozoic and Early Mesozoic ages. There are several sites (Kundel, Konyukhta, Legostaevo) with established Permian-Triassic gold mineralization. The article presents the characteristics of the such sites containing the Permian-Triassic gold mineralization. The conclusion is made about the widespread gold mineralization in the Altai-Sayany folded region. This type of mineralization takes its regular position in a number of different mineralization types of this metallogenic epoch. The formation of such mineralization probably is concerned with plume mantlecrustal basic and granitoid magmatism. © SGEM2014. All Rights Reserved.

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