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.
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.
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.
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.