The first discovery of natural duralumin     

V. I. Silaev  G. A. Karpov  L. P. Anikin  V. N. Filippov  V. A. Petrovsky  A. E. Sukharev  Yu. S. Simakova 《Doklady Earth Sciences》2017,476(1):1048-1053

The results of X-ray structural, electron-microscopic, and X-ray spectral microprobe studies of Al-based metal solid solutions that underwent nuclear disintegration and that were discovered in nature for the first time are presented. Based on the similarity to technical counterparts, it is suggested to recognize the previously unknown alloys as natural duralumin.  相似文献   

The first section of vendian deposits in the basement complex of the West Siberian petroleum megabasin (resulting from the drilling of the Vostok-3 parametric borehole in the Eastern Tomsk region)     

A. E. Kontorovich  B. S. Sokolov  V. A. Kontorovich  A. I. Varlamov  D. V. Grazhdankin  A. S. Efimov  A. G. Klets  S. V. Saraev  A. A. Terleev  S. Yu. Belyaev  I. V. Varaksina  G. A. Karlova  B. B. Kochnev  K. E. Nagavitsin  A. A. Postnikov  Yu. F. Filippov 《Doklady Earth Sciences》2009,425(1):219-222

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Pacific superplume-related oceanic basalts hosted by accretionary complexes of Central Asia, Russian Far East and Japan   总被引：5，自引：0，他引：5  

I. Yu. Safonova  A. Utsunomiya  S. Kojima  S. Nakae  O. Tomurtogoo  A.N. Filippov  K. Koizumi 《Gondwana Research》2009,16(3-4):587-608

Plume-related oceanic magmatism form oceanic islands, seamounts and plateaus (hereafter “seamounts” or “paleoseamounts”), which are important features in geological history. The accretion of oceanic seamounts to active continental margins significantly contributed to the formation of the continental crust. This paper reviews occurrences of Late Neoproterozoic–Mesozoic seamounts of the Paleo-Asian and Paleo-Pacific oceans, which are hosted by accretionary complexes (ACs) of Russian Altai, East Kazakhstan, Mongolia, Russian Far East and Japan. The paleoseamounts commonly consist of Ti–LREE–Nb-enriched plume-related basalts (OIB-type or intraplate basalts) capped with massive limestone and associated with other units of oceanic plate stratigraphy (OPS): oceanic floor basalts (MORB), pelagic chert, epiclastic slope facies, etc. The paper presents available geochemical data on the plume-related basalts including the first geochemical data on the Middle Paleozoic OIB-type basalts of the Paleo-Asian Ocean hosted by the Ulaanbaatar AC of Mongolia. An emphasis is made for the structural setting of OPS units, specific geochemical features of intraplate basalts, problems of their identification, and distinguishing from magmatic units of a different origin such as MORB, island-arc and back-arc basalts. Finally, we propose a continuous, though periodical, evolution of the Pacific superplume-related magmatism, which can be more reliably proved by studying Middle Paleozoic OPS units hosted by ACs of Mongolia and Tien Shan, and discuss prospects of future studies.  相似文献   

Condensation of combustion products in the exhaust plumes of rocket engines in the upper atmosphere     

Yu. V. Platov  A. I. Semenov  B. P. Filippov 《Geomagnetism and Aeronomy》2011,51(4):550-556

The condensation process of water vapors in the exhaust plume of a rocket engine in the upper atmosphere is considered. We take into account the processes of particle heating during the release of latent heat of condensation, radiative heating, and energy losses to emission. From the solution of the equations of thermal balance and mass balance of condensing particles, we obtained the time dependences of variations in temperature and particle sizes. In the process of condensation, the thickness of the ice layer on particles may reach >70 Å.  相似文献   

The Gagarka gold deposit in the central Urals, Russia     

V. A. Filippov  V. F. Ryabinin  Z. Z. Syzoeva 《Geology of Ore Deposits》2013,55(1):27-40

The Gagarka gold deposit was formed in two stages. The gold-telluride ore of the main early stage was formed ～260 Ma ago synchronously with Permian collision, which was accompanied by retrograde metamorphism with mobilization of Au and Te from geochemically similar massive sulfide lodes in the rift zone. The Au-bearing argillic metasomatic rocks of the late stage presumably Mesozoic in age are distinguished by specific geochemistry and locally superposed on the ore related to the early stage. The upper part of the metasomatic column consists of quartz-kaolinite rock, which is confused in many cases with products of Mesozoic-Cenozoic weathering and because of this is not perceived as a guide for hidden Au-bearing argillic alteration, whose resource potential remains underestimated in the Urals.  相似文献   

Height of a solar filament before eruption     

B. P. Filippov 《Astronomy Reports》2013,57(10):778-785

The relationship between the height of a solar filament observed above the photosphere before the eruption on October 21, 2010, and the critical height of a stable equilibrium of magnetic flux ropes in the coronal magnetic field is analyzed. Data from the SDO, SOHO, and STEREO space observatories observing at different viewing angles makes it possible to deduce these parameters with high accuracy. It is shown that the filament height slowly increased over several days, with the eruption occuring when the height reached the critical value of 80 Mm.  相似文献   

Electric Current Equilibrium in the Corona     

Boris Filippov 《Solar physics》2013,283(2):401-411

A hyperbolic flux-tube configuration containing a null point below the flux rope is considered as a pre-eruptive state of coronal mass ejections that start simultaneously with flares. We demonstrate that this configuration is unstable and cannot exist for a long time in the solar corona. The inference follows from general equilibrium conditions and from analyzing simple models of the flux-rope equilibrium. A direct consequence of the stable flux-rope equilibrium in the corona are separatrices in the horizontal-field distribution in the chromosphere. They can be recognized as specific “herring-bone structures” in a chromospheric fibril pattern.  相似文献   

The late Holocene mollusc fauna of the Aral Sea and its biogeographical and ecological interpretation     

Andrei Filippov 《Limnologica》2009,39(1):67-85

The Aral Sea, in 1960 the fourth largest lake on Earth, has since experienced a catastrophic environmental change, which appears to be mainly a result of human impact. Here, we attempt to add to a better understanding of environmental changes during the last millennium by using fossil mollusc assemblages obtained from 10 sediment cores, which were taken by gravity coring in 1991. The biogeographical analysis demonstrates that no endemic molluscs have existed in the Aral Sea during the last 1000 years. The investigated taxa are of Caspian and Palaearctic origin. The molluscan biodiversity is much lower than previously assumed and particularly low for such a large lake, indicating unstable ecological conditions during the period investigated. Using comparative ecological analyses of thanatocoenoses and stable isotope ratios in gastropod shells, we conclude that the main lake level changes of the last millennium were strong and abrupt, showing relative high stands at about 1300 AD and 1650 AD.  相似文献   

On the origin of the prolate solar chromosphere     

Filippov  Boris  Koutchmy  Serge 《Solar physics》2000,196(2):311-320

A simple geometric model is proposed to explain the recently reported effect of the prolateness of the solar chromosphere. We assume that a specific dynamical part of the solar atmosphere above the 2 Mm level, being a mixture of moving up and down jets of chromospheric matter with the coronal plasma between them, is responsible for the solar prolateness. Due to the dynamic nature of this layer, the magnetic field is considered to play a very important role in the density distribution with the height, guiding the mass flows along the field lines. The difference of the magnetic field topology in the polar and the equatorial regions leads to different heights of the chromospheric limb. Calculations show a satisfactory coincidence with observations when the mean separation between opposite polarity concentrations is about 9 Mm. The possible observational signature of this network in low photospheric and chromospheric layers is discussed.  相似文献   

A section of Vendian in the east of West Siberian Plate (based on data from the Borehole Vostok 3)     

A.E. Kontorovich  A.I. Varlamov  D.V. Grazhdankin  G.A. Karlova  A.G. Klets  V.A. Kontorovich  S.V. Saraev  A.A. Terleev  S.Yu. Belyaev  I.V. Varaksina  A.S. Efimov  B.B. Kochnev  K.E. Nagovitsin  A.A. Postnikov  Yu.F. Filippov 《Russian Geology and Geophysics》2008,49(12):932-939

The Borehole Vostok 3 drilled in the east of the West Siberian Plate (Tomsk Region) revealed a Vendian section in the depth range 5002–3870 m, which was subdivided into the Poiga, Kotodzha, and Raiga Formations based on geological, geophysical, and paleontological data. In the Kotodzha and Raiga Formations, typical Upper Vendian fossils of Cloudina hartmanae and Namacalathus sp. were found along with diverse Platysolenites, which are commonly considered to be of zonal significance in Lower Cambrian strata. Hence, the stratigraphic interval with abundant diverse Platysolenites has a wider stratigraphic range than it was believed earlier and seems to cover the Upper Vendian and Lower Cambrian deposits. The Borehole Vostok 3 is the first Siberian occurrence of the fossils Namacalathus, the world's fourth occurrence of the Cloudina-Namacalathus association, and the first site where coexisting Platysolenites and typical Vendian organisms have been found. Therefore, the borehole provides one of the most informative (in paleontological context) Upper Vendian sections.  相似文献