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1.
A. R. Geptner T. A. Ivanovskaya E. V. Pokrovskaya N. P. Kuralenko 《Lithology and Mineral Resources》2008,43(3):228-249
It is shown that glauconite-bearing interbeds are widespread in the layer-by-layer studied sections on the Sea of Okhotsk coast (Mainach section) and Kheisliveem River valley (Kavran section), the volcanoterrigenous rocks of the Kovachin, Amanin, and Gakkhin formations of the Paleogene in western Kamchatka (Upper Eocene-Lower Oligocene boundary beds). Detailed mineralogical and structural-crystallochemical characteristics of glauconite from the Amanin Formation are presented. It is suggested that such glauconite should not be used for geochronological purposes.Some specific features of glauconite formation, particularly, the preservation of specific morphological forms at high accumulation rates of volcano-terrigenous rocks, are discussed. Possibility of the formation of glauconite with the active influence of bacterial metabolism is considered. 相似文献
2.
Simanovich I. M. Golovin D. I. Bujakaite M. I. Vinogradov V. I. Sakharov B. A. Matsapulin V. U. Sokolova A. L. Pokrovskaya E. V. 《Lithology and Mineral Resources》2004,39(6):555-565
The influence of geodynamic factors on the postsedimentary lithogenesis of terrigenous sequences during the replacement of the passive continental-margin regime to the active regime is considered with the Toarcian–Aalenian complexes of southern Dagestan as an example. It has been established that clayey rocks were lithified under conditions of subsidence lithogenesis, whereas the orogenic catagenesis of sandy rocks was related to stress initiated by the initial (amagmatic) subduction phase. The Kübler index has been used to reveal the postsedimentary zonality that is consistent with the intensity of folding and cleavage. The metagenesis zone fits the cleavage zone. The Rb–Sr and K–Ar datings of clayey rocks from the metagenesis zone yielded 180–190 Ma that can be interpreted as the timing of the maximal manifestation of postsedimentary lithogenesis. 相似文献
3.
A. R. Geptner T. A. Ivanovskaya E. V. Pokrovskaya S. M. Lyapunov A. T. Savichev A. V. Gorbunov N. V. Gor’kova 《Lithology and Mineral Resources》2007,42(5):453-476
Results of the mineral and chemical study of surface-altered hyaloclastites from the Theistareykir and Nämafjall geothermal zones, the North Iceland rift, are considered. The paper scrutinizes the composition of hydrothermally altered rocks mainly consisting of clay minerals related to the transformation of bedrock hyaloclastites. The clay minerals also make up slope talus or proluvial deltas around highlands. The major clay minerals in areas of the present-day fumarole activity are kaolinite and smectite, while the redeposited talus-proluvial sediments are mainly composed of smectites. The studied rocks contain framboids, globules, rods, and other structures with morphology and size similar to those of mineralized bacteria. The local concentration of Ag in proluvial deposits is attributed to the intense bacterial activity. It is supposed that elevated contents of some trace elements could be related to an intense microbiotic influence. 相似文献
4.
D. M. Ermakov E. A. Sharkov I. V. Pokrovskaya A. P. Chernushich 《Izvestiya Atmospheric and Oceanic Physics》2013,49(9):974-985
The trajectory characteristics and the intensity evolution of the Alberto tropical cyclone (TC) in the integral water-vapor field are analyzed in detail using a software-algorithmic complex designed for constructing highly detailed global radio-thermal fields of the ocean-atmosphere system based on microwave satellite measurements. This complex was developed by the authors earlier and allows one to obtain global animated radio-thermal fields with a time step of 1.5 h and a spatial resolution of 0.2°. Special attention is paid to the problem of revealing the energy sources of three consecutive intensifications of this TC. The analysis of satellite data with the use of the animation method developed by the authors shows for the first time that these sources are regions with an increased (exceeding the critical level) integral water-vapor content located in different geographical areas lying along the complex trajectory of the TC with a variable intensity. The first region was located in the equatorial intertropical convergence zone, the second was located above the Gulf Stream water area, and the third resided in the area affected by the Azores High. 相似文献
5.
Mixed-layer corrensite-chlorites and their formation mechanism in the glauconitic sandstone-clayey rocks (Riphean, Anabar Uplift) 总被引：1，自引：0，他引：1
V. A. Drits T. A. Ivanovskaya B. A. Sakharov B. B. Zviagina N. V. Gor’kova E. V. Pokrovskaya A. T. Savichev 《Lithology and Mineral Resources》2011,46(6):566-593
The paper presents the first detailed mineralogical, structural, and crystal-chemical characteristics of the mixed-layer corrensite-chlorites
from the glauconitic sandy-clayey rocks that make up the bottom (0.10 m) of a basal member (1.50 m) of the lower subformation
of the Yusmastakh Formation (Riphean, Anabar Uplift, North Siberia). Like the overlying mudstones (1.40 m) in the basal member,
these rocks are generally transformed up to the deep catagenesis level and included in a thick dolomite sequence. In mudstones
represented by the dioctahedral micas, the corrensite-type minerals are observed as traces. 相似文献
6.
V. A. Drits T. A. Ivanovskaya B. A. Sakharov B. B. Zvyagina A. Derkowski N. V. Gor’kova E. V. Pokrovskaya A. T. Savichev T. S. Zaitseva 《Lithology and Mineral Resources》2010,45(6):555-576
The detailed mineralogical and structural-crystal-chemical characteristics are reported for the first time for glauconite grains extracted from the fine-platy silty-sandy dolomites at the roof of the lower subformation of the Yusmastakh Formation (Riphean, Anabar Uplift, North Siberia). Based on the complex study (X-ray diffraction, classical chemical analysis, microprobe analysis, IR-spectroscopy, thermogravimetric analysis, scanning electron microscopy with microprobe analysis, and Mössbauer spectroscopy), it was demonstrated that the studied glauconite sample is characterized by unique chemical and structural heterogeneity.The mineral structure consists of micaceous (90%), smectite (6%), and di-trioctahedral chlorite (4%) layers. Mica is classed with Al-glauconite (Al > Fe3+) with elevated Mg content. The elevated Mg mole fraction of the mineral is caused by the presence of Mg-bearing brucite-type interlayers of di-trioctahedral chlorite and the high Mg content in the octahedral sheets of 2: 1 layers. It was first discovered that glauconites are characterized by the heterogeneous distribution of cations over the available trans- and cis-octahedra due to the coexistence of trans- and cis-vacant octahedra and small trioctahedral clusters in octahedral sheets. The distribution of isomorphic cations over the accessible octahedral sites is also heterogeneous due to the tendency of Fe, Mg and Al, Mg cations to segregation and formation of corresponding domains.It was found that structure of the studied glauconite has a specific stacking defect: in addition to the predominant subsequent layers of similar azimuthal orientation according to 1M type (～77%), some layer fragments are rotated at 180° (～15%) and ±120° (8%). The structural-crystal-chemical heterogeneity of the mineral is explained by the fact that its microcrystals grew in the dolomitic sediment under nonequilibrium conditions of the reduction zone of a shallow-water basin with a sufficiently high content of Mg cations, which significantly contributed to the glauconite formation. 相似文献
7.
Stukalova I. E. Petrova V. V. Sakharov B. A. Pokrovskaya E. V. 《Lithology and Mineral Resources》2001,36(3):243-254
The rare mineral, potassium tobelite being the NH4-bearing mica, was first described in Lower Carboniferous coal-bearing rocks of the Egorshin–Kamensk district on the eastern slope of the Urals. It was formed from kaolinite and pyrophyllite at temperature less than 500°C and pressure about 2000 atm. The formation of tobelite was probably favored by postsedimentary stresses. Owing to sharp increase in pressure, gases were released from organic matter of the coal-bearing sequence and transformed into ammonia, which was subsequently incorporated as NH+
4in the structure of clay minerals. The potassium tobelite is an indicator of high-grade metamorphism (up to anthracite rank) of the organic matter in coal-bearing sequences. 相似文献
8.
A. R. Geptner T. A. Ivanovskaya E. V. Pokrovskaya 《Lithology and Mineral Resources》2005,40(6):505-520
The fossilization of biota and formation of low- and high-temperature hydrothermally altered rocks were studied in solfataric fields, artificial hot lakes, at natural hot springs, and on heated beach within the present-day rift zone at the Reykjanes, Nesjavellir, Geysir, Landmannalaugar, Namafjall, and Oxarfjodur geothermal areas. The hydrothermally altered rocks can be divided into the following mineral types: (1) smectite assemblage with iron oxides and hydroxides; (2) smectite assemblage with sulfides (pyrite); (3) kaolinite-metahalloysite assemblage with sulfates, anatase, and boehmite; and (4) siliceous assemblage. The detailed study of the hydrothermally altered rocks allowed us to elucidate some environmental features of modern fossilization and replacement of organic matter with clay minerals, iron oxyhydroxides, and silica. The fossilized microstructures have been described in rocks of the smectite and siliceous assemblages. It has been shown that the pseudobiomorphic (actually, abiogenic) micro- and nannostructures are formed in the moving water of silica deposition zone. 相似文献
9.
M. I. Tuchkova G. E. Bondarenko M. I. Buyakaite D. I. Golovin I. O. Galuskina E. V. Pokrovskaya 《Geotectonics》2007,41(5):403-421
This paper presents the results of structural, lithologic, and geochronological (K-Ar, Rb-Sr) studies of the Carnian terrigenous rocks in the sedimentary cover of the Chukchi microcontinent and U-Pb dating of detrital zircons. From the lithological features, three types of sections are recognized. Terrigenous sequences of the first type were deposited on the outer shelf in the distal zone of the prograding delta, sequences of the second type accumulated at the rise of continental slope, and sediments of the third type are characteristic of the pelagic zone. In mineralogy and geochemistry, sandstones are rather uniform and inherit the sialic composition of provenance. The detrital zircons comprise several populations with predominance of the varieties derived from igneous rocks. The U-Pb age of the youngest population is 236–255 Ma. The conditions of postsedimentation alteration reached those of greenschist metamorphic facies and anchimetamorphism. Several cleavage systems have been established. Sericite related to the oldest system is distinguished by elevated Ti, Mn, and Fe components. The first stage of deformation of the Carnian sedimentary rocks about 200 Ma ago resulted in the rearrangement of K-Ar and Rb-Sr isotopic systems in whole-rock samples and minerals and is clearly recorded in isotopic data. It is suggested that the deformation related to the normal faulting in Triassic rocks and the emergence of the Lesser Anyui Block were plausible causes of the first structural rearrangement. 相似文献
10.
D. M. Ermakov A. P. Chernushich E. A. Sharkov I. V. Pokrovskaya 《Izvestiya Atmospheric and Oceanic Physics》2013,49(9):963-973
The possibility of utilizing a specialized approach to the space-time interpolation of satellite data that takes the kinematics of multiscale processes into account in solving the problems of remote sensing of fast processes in the Earth’s atmosphere is considered. The approach is borrowed from the rapidly progressing disciplines of machine vision and video data compression. The main advantages of this method are its completeness with respect to the input (interpolated) satellite data, its capacity to estimate the kinematics of multiscale processes and take it into account, a relatively low computational cost, and the ease of its software-algorithmic implementation. The problem of an “instantaneous” source of hidden energy for the intensification of Tropical Cyclone (TC) Katrina is solved based on the developed software-algorithmic approach using data from the SSM/I satellite radiometers of the DMSP mission. 相似文献