A model of productive Miocene deposits,Odoptu area,Sea of Okhotsk     

A. L. Volkonskaya  I. N. Kerusov  A. I. Konyukhov  E. E. Karnyushina  O. V. Krylov  G. A. Kalmykov 《Moscow University Geology Bulletin》2017,72(5):349-354

The efficiency and abilities of the sequence-stratigraphic approach to the integrated interpretation of seismic and well data are considered based on the example of the Lower Nutovo subhorizon of the Odoptu area. The results of this study were used to build a sequence stratigraphic model, a curve of the relative sealevel changes, and a regional chronostratigraphic chart tied to the geochronologic timescale.  相似文献   

Deep structure of the baikal and other continental rift zones from seismic data   总被引：1，自引：0，他引：1  

N.N. Puzyrev  M.M. Mandelbaum  S.V. Krylov  B.P. Mishenkin  G.V. Petrik  G.V. Krupskaya 《Tectonophysics》1978,45(1):15-22

Abyssal variations beneath the Baikal rift zone are revealed in an irregular seismic stratification of the crust, the presence of an intracrust waveguide and by the vast (> 200,000 km²) underlying area of anomalously low velocity (P_n = 7.6−7.8 km/sec) uppermost mantle. In its abyssal structure the Baikal rift is heterogeneous along the strike, with sharp changes in crustal thickness (35–50 km).Comparison of first-arrival seismic-velocity curves and also the respective velocity columns reveals the essential similarity of upper-mantle seismic cross-sections for all continental rift zones. The anomalous upper layer of the mantle (ca. 7.7 km/sec) is relatively thin (15-13 km) and can be linked with the mantle waveguide only locally.  相似文献   

Six new stromatolitic microbiotas from the Proterozoic of the Soviet Union     

J.W. Schopf  T.A. Dolnik  I.N. Krylov  C.V. Mendelson  B.B. Nazarov  A.V. Nyberg  Yu.K. Sovietov  M.S. Yakshin 《Precambrian Research》1977,4(3):269-284

Diverse assemblages of cellularly preserved Precambrian microorganisms have been discovered in cherty stromatolitic sediments from six formations in the Soviet Union: Sukhotungusin Fm. (Middle Riphean, Siberia); Valukhtin Fm. (Middle Riphean, Siberia); Shorikha Fm. (Upper Riphean, Siberia); Minyar Fm. (Upper Riphean, Bashkiria); Olkhin Fm. (Upper Riphean, Siberia); and Chichkan Fm. (Vendian, Kazakstan). These cyanophyte-dominated microbial communities, occurring in both stratiform (cf. Stratifera) and columnar stromatolitic deposits (Baicalia hirta and Conophyton gaubitza), are the first stromatolite-building microbiotas to be reported from the Soviet Union; collectively they comprise more than one-fifth of all such Precambrian assemblages now known.  相似文献   

Deep seismic investigations in the Baikal rift zone     

N.N. Puzyrev  M.M. MandelBaum  S.V. Krylov  B.P. Mishenkin  G.V. Krupskaya  G.V. Petrick 《Tectonophysics》1973,20(1-4):85-95

The largest rift zone of Europe and Asia is located in the region of Lake Baikal. In 1968–1970 deep seismic measurements were carried out along a number of profiles with a total length of about 2000 km within the rift zone and in the adjacent parts of the Siberian platform and the region of the Baikal Mountains. These investigations were of a reconnaissance nature, and therefore the point sounding method was used.A low-velocity region for compressional waves (7.6–7.8 km/sec) has been found and could be traced over a large area in the upper parts of the mantle. The width of this anomalous zone is 200–400 km. The Baikal rift lies in its northwestern part. Within the studied part of the Siberian platform the thickness of the earth's crust is 37–39 km, while in the rift zone it is 36 km, and further to the southeast the crust-mantle boundary lies at a depth of 45–46 km. The Baikal rift proper is bounded in the northwest by a deep fracture zone and does not seem to be associated with any significant “root” or “antiroot” in the relief of the Mohorovi?i? discontinuity.The reduced compressional velocity in the upper parts of the mantle beneath the Baikal zone is considered to correspond to the same phenomena found under the mid-oceanic ridges and the extended rift system in the Basin and Range province of North America. The Baikal rift in the narrow sense of the word lies over the northwestern edge of the anomalous mantle region. This asymmetric position seems to be its main peculiarity.  相似文献   

Clay Mineral Associations in Triassic–Lower Cretaceous Rocks of the Dal'negorsk Key Section, Southern Sikhote Alin     

M. I. Tuchkova  N. Yu. Bragin  K. A. Krylov 《Lithology and Mineral Resources》2004,39(2):156-168

Investigation of the Triassic–Lower Cretaceous rocks of the Dal'negorsk key section (southern Sikhote Alin) revealed the following successive associations of authigenic clay minerals: (1) sericite–chlorite (Lower Triassic); (2) mica–chlorite (Anisian–Norian); (3) chlorite–mica (Rhaetian–Lower Jurassic); and (4) smectite–chlorite–mica (Upper Jurassic–Lower Cretaceous). These four associations reflect the primary composition of terrigenous admixture in the siliceous sediments and, hence, serve as important indicators of paleosedimentation conditions. The first association represents a product of the erosion of metamorphic rock complexes. The second one reflects the onset of volcanic activity within the sedimentation basin coinciding in time with a vigorous bloom of siliceous plankton (radiolarians) and short-term appearance of specific (anoxic) carbonaceous sediments in the sequence. The third association characterizes the epoch of minimal supply of the basin with volcanic and terrigenous clastic materials and the dominant accumulation of almost pure planktonogenic sediments. The fourth association marks the change of marginal-marine conditions for pelagic ones and is expressed in a significant input of pyroclastic and clastic materials and the formation of distal flysch deposits.  相似文献   

Geochemistry,Formation Settings,and Ore Potential of the Volcano-Sedimentary Complexes of Pryangarya,Yenisei Ridge     

Nozhkin  A. D.  Kozlov  P. S.  Likhanov  I. I.  Reverdatto  V. V.  Krylov  A. A. 《Doklady Earth Sciences》2021,501(2):1023-1028

Doklady Earth Sciences - In the Angara part of the Yenisei Ridge, a sequential section of the metapicrite–basalt sequence and the overlying carbonate rocks of the Gorevskaya suite has been...  相似文献   

A Long-Lived Center of Gas–Fluid Emanations on the Western Slope of the Kuril Basin (Sea of Okhotsk)     

Derkachev  A. N.  Nikolaeva  N. A.  Tsoy  I. B.  Baranov  B. V.  Barinov  N. N.  Mozherovskiy  A. V.  Krylov  A. A.  Kuznetsov  A. B.  Minami  H.  Hachikubo  A. 《Lithology and Mineral Resources》2021,56(4):309-332

Lithology and Mineral Resources - The paper presents the results of multidisciplinary studies in the carbonate–barite mineralization area revealed on the western slope of the Kuril deep-water...  相似文献   

Isotopic composition of gas hydrates in subsurface sediments from offshore Sakhalin Island, Sea of Okhotsk   总被引：1，自引：1，他引：0  

Akihiro Hachikubo  Alexey Krylov  Hirotoshi Sakagami  Hirotsugu Minami  Yutaka Nunokawa  Hitoshi Shoji  Tatiana Matveeva  Young K. Jin  Anatoly Obzhirov 《Geo-Marine Letters》2010,30(3-4):313-319

Hydrate-bearing sediment cores were retrieved from recently discovered seepage sites located offshore Sakhalin Island in the Sea of Okhotsk. We obtained samples of natural gas hydrates and dissolved gas in pore water using a headspace gas method for determining their molecular and isotopic compositions. Molecular composition ratios C₁/_C2+ from all the seepage sites were in the range of 1,500–50,000, while δ¹³C and δD values of methane ranged from ?66.0 to ?63.2‰ VPDB and ?204.6 to ?196.7‰ VSMOW, respectively. These results indicate that the methane was produced by microbial reduction of CO₂. δ¹³C values of ethane and propane (i.e., ?40.8 to ?27.4‰ VPDB and ?41.3 to ?30.6‰ VPDB, respectively) showed that small amounts of thermogenic gas were mixed with microbial methane. We also analyzed the isotopic difference between hydrate-bound and dissolved gases, and discovered that the magnitude by which the δD hydrate gas was smaller than that of dissolved gas was in the range 4.3–16.6‰, while there were no differences in δ¹³C values. Based on isotopic fractionation of guest gas during the formation of gas hydrate, we conclude that the current gas in the pore water is the source of the gas hydrate at the VNIIOkeangeologia and Giselle Flare sites, but not the source of the gas hydrate at the Hieroglyph and KOPRI sites.  相似文献   

Clay minerals as an indicator of the accumulation of the Upper Quaternary deposits in the St. Anna Trough (Kara Sea)     

A. A. Krylov  D. Weiel  V. F. Sapega  G. I. Ivanov  R. Stein  C. Vogt  E. O. Rys’kova 《Oceanology》2008,48(1):85-93

This paper is devoted to the studies of clay minerals from two cores collected in the northern and central regions of the St. Anna Trough, the largest trough of the Kara Sea. The Upper Quaternary glacial, glaciomarine, and marine deposits are characterized by various contents of kaolinite, chlorite, illite, and smectite. It is established that, from older to younger deposits, the amounts of kaolinite and chlorite generally decrease, while those of illite and smectite, on the contrary, increase. A joint analysis of the distributions of clay and heavy minerals over the section allowed us to refine the position of the sources for the terrigenous matter and their temporal variability. It is shown the changes in the sources of supply were directly related to the climate changes that occurred when passing from the glacial to marine sedimentation environments.  相似文献   

Unusually high thermal stability of the Uranium-Xenon isotopic system in nonmetamict zircons     

Shukolyukov  Yu. A.  Fugzan  M. M.  Paderin  I. P.  Sergeev  S. A.  Krylov  D. P. 《Doklady Earth Sciences》2009,425(1):287-290

Doklady Earth Sciences -  相似文献