New Data on the Chronostratigraphy of the Upper Pleistocene Loess–Soil Series in Southwestern Siberia     

Zykina  V. S.  Zykin  V. S.  Volvakh  N. Ye.  Volvakh  A. O.  Murray  A. S.  Taratunina  N. A.  Kurbanov  R. N. 《Doklady Earth Sciences》2021,500(2):870-874

Doklady Earth Sciences - We have analyzed the modern status of the chronostratigraphic differentiation of the loess–paleosoil series in southwestern Siberia and the results of luminescence...  相似文献   

Formation Conditions of Host Rocks and Veins of Productive Deposits of the Astrakhan Gas–Condensate Field     

Sokerina  N. V.  Zykin  N. N.  Shanina  S. N.  Valyaeva  O. V.  Isaenko  S. I.  Sokerin  M. Yu. 《Doklady Earth Sciences》2019,484(1):58-60

Doklady Earth Sciences - One- (gas) and two-phase (aqueous solution plus gas) inclusions are studied in calcite taken from the Cheremshan horizon of the Bashkirian stage at a depth of...  相似文献   

Magnetic indicator of global paleoclimate cycles in Siberian loess–paleosol sequences     

Vadim A. Kravchinsky  Valentina S. Zykina  Vladimir S. Zykin 《Earth and Planetary Science Letters》2008,265(3-4):498-514

The loess–paleosol sequences of China, Siberia, Alaska and many other regions, along with lake sediments and glaciers, provide the only accurate paleoclimatic terrestrial records for intervals of thousands to hundreds of thousand years. The frequency dependence (FD) of magnetic susceptibility (MS) in such sequences has become the leading parameter for analyzing climatic change and Milankovitch (astronomical) periodicity in Siberian sequences; it is always higher in soil horizons than in loess. The enhanced FD parameter in soils is associated with ferromagnetic minerals, mostly magnetite, produced during pedogenesis. The MS and FD parameters of 670 samples from five sections in Siberia are reported here. Inter-section correlation is used to produce a combined FD time series for the studied sections. Chronological control is established by absolute dating and stratigraphic correlation. Spectral analysis of the FD time series reveals the presence of Milankovitch signals at ～100 kyr (eccentricity), ～40 kyr (obliquity) and ～23 kyr (precession) and demonstrates that Siberian loess–paleosol sequences are excellent continental recorders of long-term paleoclimatic changes. This suggests that the FD parameter can potentially be used more widely for evaluation of climate periodicity in loess/paleosol sequences in other parts of the world.  相似文献   

Debatable aspects of initial human colonization of Siberia and age of the Karama site in the Altai Mountains     

V. S. Zykin  V. S. Zykina  L. G. Smolyaninova 《Stratigraphy and Geological Correlation》2016,24(3):313-330

Debatable aspects of age, stratigraphic position, and natural conditions of the oldest stratified Early Paleolithic Karama site in the Altai Mountains are critically revised. The extensive geological, stratigraphic, and paleontological data allow the sufficiently well-substantiated assumption that accumulation of the Karama Formation and existence of the Early Paleolithic Karama site correspond to a long period of climate warming in the Early Pleistocene correlated with the Tiglian of northwestern Europe lasting from 2.23 to 1.59 Ma. The age model proposed for the formation of the Quaternary sequence in the Anui River valley, which includes the artifact-containing deposits of the Karama site, seems to be the most probable one proceeding from interpretation of available data on the geological structure, stratigraphy, paleomagnetism, and paleontological and lithological properties of Upper Cenozoic sequences observable both in the Anui River valley and in Siberian areas adjacent to the Altai mountainous region.  相似文献   

Geochemistry of carbonated mineral waters from the Fadeevskoe deposit of the Primorye region     

N. A. Kharitonova  G. A. Chelnokov  E. A. Vakh  A. A. Karabtsov  N. N. Zykin 《Russian Journal of Pacific Geology》2010,4(1):78-90

The geochemical study of bed rocks, underground and surface waters, and associated gases in the Fadeevskoe deposit of carbonated waters (Sikhote Alin, Primorye region) revealed that the chemical composition of these waters is formed in the zone of active water exchange in the limited area of the discharge zone, where hydro carbonate calcic waters with mineralization of up to 1 g/1 are formed in largely potassic-sodic rocks. Calculations of the saturation indices show that the mineral waters are characterized by the early stage of Ca saturation, being undersaturated with carbonates and aluminosilicates. The main factors that influence the water mineralization are the excess carbon dioxide in water and the circulation time. The oxygen and carbon isotope ratios indicate the atmospheric genesis of the aqueous component (δ²H = —117; δ¹⁸O = —15.4%o) and the carbon isotope content in the CO₂ implies the mantle nature of the carbon dioxide (δ¹³C = -9.9%o).  相似文献   

Conditions of formation of gold-bearing quartz veins in the upper reaches of the Kozhim“yu River, Northern Urals     

N. V. Sokerina  N. N. Zykin  S. K. Kuznetsov  V. A. Zharkov  S. I. Isaenko  S. N. Shanina 《Geochemistry International》2013,51(1):76-82

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Paleomagnetic study of Cenozoic sediments from the Zaisan basin (SE Kazakhstan) and the Chuya depression (Siberian Altai): tectonic implications for central Asia     

J. C. Thomas  R. Lanza  A. Kazansky  V. Zykin  N. Semakov  D. Mitrokhin  D. Delvaux 《Tectonophysics》2002,351(1-2)

This paper presents new paleomagnetic results on Cenozoic rocks from northern central Asia. Eighteen sites were sampled in Pliocene to Miocene clays and sandy clays of the Zaisan basin (southeastern Kazakhstan) and 12 sites in the upper Oligocene to Pleistocene clays and sandstones of the Chuya depression (Siberian Altai).Thermal demagnetization of isothermal remanent magnetization (IRM) showed that hematite and magnetite are the main ferromagnetic minerals in the deposits of the Zaisan basin. Stepwise thermal demagnetization up to 640–660 °C isolated a characteristic (ChRM) component of either normal or reverse polarity at nine sites. At two other sites, the great circles convergence method yielded a definite direction. Measurements of the anisotropy of magnetic susceptibility showed that the hematite-bearing sediments preserved their depositional fabric. These results suggest a primary origin of the ChRM and were substantiated by positive fold and reversal tests. The mean paleomagnetic direction for the Zaisan basin (D=9°, I=59°, k=19, α₉₅=11°) is close to the expected direction derived from the APW path of Eurasia [J. Geophys. Res. 96 (1991) 4029] and shows that the basin did not rotated relative to stable Asia during the Tertiary.In the upper Pliocene–Pleistocene sandstones of the Chuya depression, a very stable ChRM carried by hematite was found. Its mean direction (D=9°, I=46°, k=25, α₉₅=7°) is characterized by declination close to the one excepted for early Quaternary, whereas inclination is lower. In the middle Miocene to lower Pliocene clays and sandstones, a stable ChRM of both normal and reverse polarities carried by magnetite was isolated. Its mean direction (D=332°, I=63°, k=31, α₉₅=4°) is deviated with respect to the reference direction and implies a Neogene, 39±8° counterclockwise rotation of the Chuya depression relative to stable Asia. These results and those from the literature suggest that the different amount of rotation found in the two basins is related to a sharp variation in their tectonic style, predominantly compressive in the Zaisan basin and transpressive in the Siberian Altai. At a larger scale, the pattern of vertical axis rotations deduced from paleomagnetic data in northern central Asia is consistent with the hypothesis of a large left-lateral shear zone running from the Pamirs to the Baikal. Heterogeneous rotations, however, indicate changes in style of faulting along the shear zone and local effect for the domains with the largest rotations.  相似文献   

Accumulations of block material in the Chuya And Katun river valleys and distribution of late pleistocene glaciation in the Altai Mountains     

V. S. Zykin  V. S. Zykina  N. V. Sennikov  A. A. Mistryukov 《Doklady Earth Sciences》2016,470(1):905-908

The data presented introduce substantial changes into Quaternary stratigraphy, paleogeography, and the geological history of the Altai Mountains. The purpose of this investigation was thorough study of block accumulations in the Chuya and Katun river valleys. The new data shed light on the structure of these deposits, their composition, the geomorphological and stratigraphic position, and the morphology of blocks. The revealed morphological features of individual blocks imply their glacial origin.  相似文献   

Genesis of the mineral groundwaters of the Razdol’nenskii occurrence in Primorye     

G. A. Chelnokov  N. A. Kharitonova  N. N. Zykin  O. F. Vereshchagina 《Russian Journal of Pacific Geology》2008,2(6):521-527

Original isotopic and chemical data are reported on the groundwater and gases from the unique occurrence of mineral water in the coastal zone of southern Primorye. Results of the δ¹⁸O and δ²H analysis of the underground and surface water of the area integrated with their δ¹³C composition made it possible to solve the problem of the genesis and evolution of groundwater and gases in the coastal part of the Sea of Japan. It was established that meteoric waters penetrate into the Mesozoic terrigenous rocks and changed their chemical composition under the influence of transformation of organic matter from the host rocks. CO₂ released owing to reactions provides multiple enrichment of the water in HCO₃ and stimulates Na influx via dissolution of aluminosilicates.  相似文献   

Geochemistry of the mineral waters and gases of the Mukhen deposit,Far East     

N. A. Kharitonova  G. A. Chelnokov  V. V. Kulakov  N. N. Zykin 《Russian Journal of Pacific Geology》2008,2(6):535-544

This work reports new hydrochemical data on the two types of cold high p CO₂ groundwaters from the Mukhen deposit (Khabarovsk district). The first type is classed with HCO₃-Ca-Mg waters with a relatively low TDS (up to 1.7 g/l) and high concentrations of Fe²⁺, Mn²⁺, Ba²⁺, and SiO₂. The second type is of HCO₃-Na composition with high TDS (up to 14 g/l) and elevated Li⁺, B, Sr²⁺, Br^?, and I^?. New oxygen (δ¹⁸O) and hydrogen (δD) isotopic data on the waters and carbon (δ¹³C) isotopic data on the gas phase, together with a detailed geological and hydrogeological analysis of the study area, allowed us to decipher the origin of both the mineral waters. Based on the tritium content (³H) in the ground and surface waters of the area, the duration of the mineral water circulation was estimated. It was established that the both types of groundwaters were formed during interaction of meteoric water with bedrock under active influence of CO₂, however HCO₃-Na groundwaters have longer residence time than HCO₃-Ca-Mg groundwaters.  相似文献