New data about tsunami evidence on Russia’s Pacific coast based on instrumental measurements for 2009–2010     

Shevchenko  G. V.  Ivel’skaya  T. N.  Kovalev  P. D.  Kovalev  D. P.  Kurkin  A. A.  Levin  B. V.  Likhacheva  O. N.  Chernov  A. G.  Shishkin  A. A. 《Doklady Earth Sciences》2011,438(2):893-898

Doklady Earth Sciences -  相似文献   

Perturbations in the ionosphere and magnetosphere during the fall of cosmic bodies onto land or ocean     

I. V. Nemchinov  Yu. I. Zetzer  A. T. Kovalev  V. V. Shuvalov 《Doklady Earth Sciences》2006,409(5):736-738

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Seismic Network on Drifted Ice Floes: a Case Study in North Barents Sea     

Jakovlev  A. V.  Kovalev  S. M.  Shimanchuk  Eg. V.  Shimanchuk  Ev. V.  Nubom  A. A. 《Doklady Earth Sciences》2021,496(2):155-159

Doklady Earth Sciences - From March to May 2019, a seasonal multidisciplinary scientific expedition on the EV Akademik Tryoshnikov was conducted in the framework of the first stage of the...  相似文献   

Age of the Raygorodok Au-bearing Gabbro—Monzodiorite Massif (Northern Kazakhstan)     

F. I. Zhimulev  Yu. A. Kalinin  V. P. Sukhorukov  E. De Pelsmaeker  M. Poujol  K. R. Kovalev  S. Glorie  E. A. Naumov  R. Seltmann  J. De Grave 《Doklady Earth Sciences》2018,481(2):1033-1036

Accessory zircon from the polyphase Raygorodok stock (Northern Kazakhstan) has been dated by local U–Pb analysis (SIMS and LA-ICP-MS). This Au-bearing intrusion has been dated to 442–447 Ma, suggesting its emplacement at the very end of the Ordovician and Early Silurian, allowing the stock’s correlation with the Stepnyak Complex of small intrusions. Thus, control of small intrusions of the Stepnyak type over gold mineralization has been corroborated permitting their use as a regional prospecting characteristic.  相似文献   

The First Quantitative Evaluation Data on Vendian Metamorphism in the Eastern Part of the Bashkir Meganticlinorium     

S.?G.?KovalevEmail author  V.?N.?Puchkov  S.?S.?Kovalev  S.?I.?Vysotskii 《Doklady Earth Sciences》2018,483(1):1418-1422

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Finds of “Ancient” Zircons in Magmatic Rocks of the Shatak Complex (Southern Urals) and Their Petrogenic Implications     

S. G. Kovalev  V. N. Puchkov  S. I. Vysotsky  S. S. Kovalev 《Doklady Earth Sciences》2018,482(2):1270-1274

New data on the presence of “old” zircons in magmatic rocks of the Shatak Complex have been obtained. This suggests that the evolution of melts in intermediate magma chambers was controlled by the AFC process, in which the liquidus phases (olivine ± clinopyroxene) fractionated, the fluid phases accumulated in the apical part of the chamber, and the host rocks were partly assimilated. Hence, the “old” zircons were entrained from the Archaean–Paleoproterozoic granite–gneiss substrate and trapped by the melt during crustal contamination.  相似文献   

The Suzdal gold-sulfide deposit in the black shale of Eastern Kazakhstan     

K. R. Kovalev  Yu. A. Kalinin  V. I. Polynov  E. L. Kydyrbekov  A. S. Borisenko  E. A. Naumov  M. I. Netesov  A. G. Klimenko  M. K. Kolesnikova 《Geology of Ore Deposits》2012,54(4):254-275

The Suzdal gold-sulfide deposit is situated in the northwestern part of the West Kalba gold belt in Eastern Kazakhstan and belongs to the genetic type of stringer-disseminated mineralized zones hosted in the Lower Carboniferous black-shale volcanic-carbonate-terrigenous sequences. Mineralization is controlled by the NE-trending Suzdal Fault. In the north, the deposit borders on the Early Triassic Semeytau volcanic-plutonic structure. Mineralization is superposed on the Late Paleozoic complex of metadolerite and quartz porphyry dikes. Ore deposition was a long-term process comprising four stages. The first stage was related to deposition of slightly auriferous pyrite syngenetic to host rocks. The second stage is characterized by formation of the first productive (with invisible gold) fine-acicular arsenopyrite mineralization accompanied by sericitization and localized in the tectonic zone. The stockwork ore with pocket-disseminated base-metal mineralization and free microscopic gold of the third stage is hosted in silicified rocks. The ore formation has been completed by quartz-stibnite veins superposed on all preceding types of mineralization. According to Ar/Ar dating of sericite, a chronological gap between the second and the third stages is estimated at 33 Ma. The deposit is an example of polygenetic and multistage mineralization.  相似文献   

Study of sea waves under the action of deep cyclones     

D. P. Kovalev 《Izvestiya Atmospheric and Oceanic Physics》2012,48(8):785-792

Data from full-scale observations of the coastal zone during the passage of deep cyclones are analyzed. The time interval when three deep cyclones acted in the region of observations was chosen. The generation of long-wave processes during cyclones with different meteorological parameters and at different directions of approaching the shore was of interest. Data from the Management of Hydrometeorological Service were invoked for compiling maps of weather conditions, and meteorological data obtained from digital meteorological stations, as well as the spectral characteristics of oscillations of the hydrostatic pressure level at observational points, were analyzed. The frequencies of excitation of long-wave oscillations caused by cyclones were determined. Particular attention was paid to the range of periods of swell and wind waves. It was detected that swell waves are excited during the approach of cyclones at uncharacteristic frequencies with their subsequent displacement into their own frequency range.  相似文献   

The electromagnetic background of the high frequency radio range during solar eclipses     

A. A. Kovalev  A. G. Kolesnik  S. A. Kolesnik  A. A. Kolmakov 《Geomagnetism and Aeronomy》2010,50(4):509-513

We examine variations in the level of the electromagnetic background of the high-frequency radio range based on monitoring data conducted in Tomsk. We establish the main laws by which it changes in various frequency bands during three solar eclipses observed in Tomsk: the level of the electromagnetic background increases to 40 dB at frequencies of 3–7 MHz, decreases to 40 dB at frequencies of 11–30 MHz, and remains almost unchanged relative to the level of control days at frequencies of 7–11 MHz.  相似文献   

Investigation of long waves in the tsunami frequency band on the southwestern shelf of Kamchatka     

P. D. Kovalev  A. B. Rabinovich  G. V. Shevchenko 《Natural Hazards》1991,4(2-3):141-159

Two inexpensive cable bottom pressure stations were installed on the southwestern shelf of Kamchatka (Okhotsk Sea) in 1987 and two more in 1988 to provide longwave measurements in the tsunami frequency band, to investigate the generating mechanism of these waves, and to test the instrumentation. Microfluctuations of atmospheric pressure were recorded simultaneously. Two cable lines were torn off by ship anchors in March 1989 but others are still working in spite of highly dynamic activity on beaches and in hard ice regimes. Careful data analysis of two months of observations (September–October, 1987) showed that: (1) the atmospheric spectra were very stable and monotonic in the period range 2–50 min and corresponded to a power law of ^–2.3, (2) the direct generation of long waves by atmospheric pressure fluctuations was negligible, (3) there was high correlation between background longwave oscillations and sea state, (4) the structure of the offshore longwave field was in good agreement with theoretical estimates of standing waves for a linear slope.  相似文献