Natural-climatic changes in the Yana-Indigirka lowland during the terminal Kargino time and habitat of late Paleolithic man in northern part of East Siberia     

V. V. Pitul’ko  E. Yu. Pavlova  S. A. Kuz’mina  P. A. Nikol’skii  A. E. Basilyan  V. E. Tumskoi  M. A. Anisimov 《Doklady Earth Sciences》2007,417(1):1256-1260

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The plankton community of the Kara Sea in early spring     

Sazhin  A. F.  Mosharov  S. A.  Romanova  N. D.  Belyaev  N. A.  Khlebopashev  P. V.  Pavlova  M. A.  Druzhkova  E. I.  Flint  M. V.  Kopylov  A. I.  Zabotkina  E. A.  Ishkulov  D. G.  Makarevich  P. R.  Pasternak  A. F.  Makkaveev  P. N.  Drozdova  A. N. 《Oceanology》2017,57(1):222-224

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Carbonate equilibrium in the water of the Razdol’naya River     

P. Ya. Tishchenko  T. A. Mikhailik  G. Yu. Pavlova  P. P. Tishchenko  A. M. Koltunov  Jing Zhang 《Geochemistry International》2017,55(3):282-293

The paper suggests an accurate approach to studying carbonate equilibrium in the water of the Razdol’naya River. The approach involves measuring pH by Pitzer’s scale, using a cell without liquid junction; measuring the total alkalinity by Bruevich’s technique; and using apparent constants of carbonate equilibrium with regard for the organic alkalinity. The Pitzer technique was employed to calculate the apparent constants of carbonate equilibrium in solution that models the riverine water: Ca(HCO₃)₂–NaCl–H₂O within the range of alkalinity of 0–0.005 mol/kg and temperatures of 0–25°C. Carbonate equilibrium in the water of the Razdol’naya River was sampled for studying at eight sites during all four seasons. Although the contents of biogenic compounds in the water are high, they can merely insignificantly affect the acid–base equilibrium, which is controlled in the riverine water by carbonate equilibrium and the concentrations of humic substances, which play the greater role, the greater the discharge of the river. In addition to the production and destruction of organic matter, carbonate equilibrium in the river is also affected by the supply of humic substances with soil waters and total alkalinity with groundwaters. The fluxes of alkalinity and humic substances annually brought by the Razdol’naya River to Amur Bay are evaluated at 1.33 × 10⁹ mol and 9.9 × 10⁶ kgC, respectively. The carbon dioxide export with the Razdol’naya River is equal to the alkalinity flux and does not depend on the weathering mechanisms.  相似文献   

Horizontal Flows of Sedimentary Matter in the Coastal Zones of the Barents and White Seas     

Mityaev  M. V.  Gerasimova  M. V.  Pavlova  L. G. 《Doklady Earth Sciences》2019,487(2):969-972

Doklady Earth Sciences - The first data on the lateral movement of sessile organisms in the water column are obtained. It is revealed that the lateral flow of suspended matter in the coastal...  相似文献   

Observations of the polarization of the radiation of R-association stars     

L. A. Pavlova  F. K. Rspaev 《Astrophysics》1986,25(3):620-625

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Einsatzmöglichkeiten von Membranprozessen zur Beseitigung organischer Substanzen aus natürlichen Wässern     

I. Dobrevski  V. Mavrov  S. Pavlova 《洁净——土壤、空气、水》1986,14(5):551-554

Membrane-filtration or dialysis techniques are increasingly used for the partial desalting of waters, e.g. brackish waters. By the use of Bulgarian PAN and acetate-cellulose separating membranes there are eliminated also organic substances – inclusive of humic matter – from natural waters to different degrees. The experimental arrangement is described and the measured results for COD-Mn, concentrations of humic acid and specific electrolytic conductivity are summarized in tables. The humic acid concentration (2.8 mg/l) was reduced by about 79 % by ultrafiltration, 82 % by reverse osmosis and 62 % by electrodialysis. The efficiency of the investigated techniques could be increased under certain conditions.  相似文献   

Crustal microdeformations and tides in the coastal zone of the Sea of Japan     

V. V. Navrotsky  E. D. Kholodkevich  E. P. Pavlova  S. A. Smirnov 《Izvestiya Physics of the Solid Earth》2007,43(6):517-523

Based on experimental data and numerical modeling, the possible mechanisms of the effect of internal gravitational waves within the range of periods from tidal values to a few tens of minutes on crustal microdeformations in the coastal zone of the Sea of Japan are examined. The spectral analysis of oscillations in the sea level and microdeformations recorded in various seasons reveals common maximums of energy at diumal and semidiurnal periods, but the coincidence of the maximums at shorter periods is random and varies with time. The phase shifts between the surface tide and crustal deformations are also unstable in time. To explain the observed interrelations between the processes at sea and in the Earth’s crust, we modeled numerically the generation of internal tides, bores, and packets of short internal waves in terms of a nonlinear model of shallow water. It is shown that the observed effects can be caused (1) by the resonance between the wavelength of the internal tide and the shelf width and (2) by the reflection of bores and internal wave packets from a steep bottom and rocky shores or by their collapse.  相似文献   

Genetic Nature of Mineralization with Native and Intermetallic Compounds in the Bobruisk Ring Structure (Republic of Belarus)     

V. I. Levitskiy  V. V. Solodilova  N. S. Zavadich  L. A. Pavlova  I. V. Levitskiy 《Doklady Earth Sciences》2018,481(1):857-861

The results of study of the Bobruisk ring structure (Republic of Belarus) containing ~80 rare rockforming and accessory minerals are reported. Among them are native (Fe, Cu, Sn, Zn, Pb, Ag, Mo, W, Al) and intermetallic (Fe, Cr, Ni, Mo, B, N, C, Si) compounds, natural alloys (Fe–Cr, Fe–Cr–Mo–W–B; brass (Cu–Zn–Pb); and bronze (Sn–Pb–Zn–Cu)). They are observed as segregations of various shapes and sizes, as well as their aggregates. The formation of mineralization is controlled by reduced mantle fluids enriched in H₂, CH₄, CO, Si, N, and O and stimulating accumulation of rare elements as native and intermetallic phases, alloys, rather than isomorphic impurities in minerals.  相似文献   

Age constraints and tectonic settings of metallogenic and magmatic events in the Verkhoyansk-Kolyma folded area     

A.V. Prokopiev  A.S. Borisenko  G.N. Gamyanin  G.G. Pavlova  V.Yu. Fridovsky  L.A. Kondrat’eva  G.S. Anisimova  V.A. Trunilina  A.I. Ivanov  A.V. Travin  O.V. Koroleva  D.A. Vasiliev  A.V. Ponomarchuk 《Russian Geology and Geophysics》2018,59(10):1237-1253

The paper presents new isotope geochronological data for several mineral deposits, ore occurrences, and related igneous bodies (plutons and dikes) in the Verkhoyansk-Kolyma folded area, eastern Yakutia. Twenty-one ⁴⁰Ar/³⁹Ar mica and four U-Pb zircon dates provide the first age constraints on key metallogenic units in the area. The dating results allow correlation between tectonic, magmatic, and metallogenic events. The sampled mineral deposits within the Adycha-Taryn fault zone in the southeastern Verkhoyansk-Chersky orogen apparently formed at the Jurassic-Cretaceous boundary during the final phase of the collision between the Siberian (North Asian) craton and the Kolyma-Omolon microcontinent (Kupol’noe deposit and the early metallogenic pulse of the Malotarynskoe deposit, ~ 143-144 Ma) and in the latest Early Cretaceous, in the beginning of the orogen collapse (Tallalakh and Dora-Pil’ deposits and the Malotarynskoe late metallogenic pulse, ~ 126 Ma). According to the suggested new classification of metallogenic units, these deposits belong to the Late Jurassic-Early Cretaceous Yana-Kolyma metallogenic belt. The Kyuchus deposit (~ 106 Ma), the Deputatsky ore cluster (~ 106-113 Ma), and the Khotoidokh deposit (~ 116 Ma) in the northern Verkhoyansk-Kolyma folded area belong to the North Verkhoyansk metallogenic belt. Their origin was associated with accretional and collisional processes that produced the Novosibirsk-Chukotka orogen in the middle Cretaceous. The Mangazeya ore cluster (~ 100 Ma, Early-Late Cretaceous boundary) in the southwestern end of the North Tirekhtyakh magmatic transverse belt belongs to the West Verkhoyansk metallogenic belt. The Nezhdaninskoe, Zaderzhnoe, Kurum, and Kuta deposits of the South Verkhoyansk area (~ 125-120 and ~ 100-95 Ma) can be joined into a single Verkhoyansk-Okhotsk metallogenic belt. The belt resulted from accretion and collision along the East Asian active continental margin and the related formation of the South Verkhoyansk orogen in the Early Cretaceous.  相似文献   

Euxinia as a dominant process during OAE1a (Early Aptian) on the Eastern Russian Platform and during OAE1b (Early Albian) in the Middle Caspian     

Svetlana O. Zorina  Oksana V. Pavlova  Bulat M. Galiullin  Vladimir P. Morozov  Alexey A. Eskin 《中国科学:地球科学(英文版)》2017,60(1):58-70

A detailed study of the mineral composition and microstructure of the black shales associated with OAE1a (Eastern Russian Platform), OAE1b (Middle Caspian), and the host rocks has been carried out using X-ray diffraction, scanning electron microscopic, and microprobe analyses. The results provide important constraints for depositional environments in the sedimentary basins. Black shales with pyrite framboids imply euxinic (sulfidic) conditions with increased organic matter preservation. Disintegrating framboids suggest partial or complete dissolution of the organic matter inside the framboids due to increasing water oxygenation. OAE1a on the Eastern Russian Platform is heterogeneous as it includes thin interbeds of concretionary coccolith limestones within the interval of bituminous shales, and correlates with the Lower Aptian Rhagodiscus angustus nannofossil zone. The coccolith limestones indicate short intermittent episodes of interrupted stagnation, rapid oxygenation, and restoration of normal marine conditions. The presence of montmorillonite, albite, microcline, and diopside in the bituminous siltstones and in the host siltstones of OAE1a on the Eastern Russian Platform, as well as a high content of titanium in the black siltstones correlated with OAE1b in the Middle Caspian allow proposing significant input of pyroclastic material into the extant sea.  相似文献