Analysis of Design Characteristics of Snake-Type Atmospheric Probes (Vetrolets) for Studying the Atmosphere of Venus     

I. A. Sobolev 《Solar System Research》2018,52(7):691-698

In Russia, work aimed at designing a spacecraft for the long-term exploration of Venus is currently underway as part of the VENUS-D project. The R&D work proposes the concept of a snake-type atmospheric probe intended for exploring the atmosphere of Venus. This article describes the principles of flight, considers the main design features and engineering characteristics of the probes, and provides recommendations for engineering solutions.  相似文献   

Some Causes of Inaccuracies of Short-Term Earthquake Prediction Taking into Account Laboratory Modeling     

Sobolev  G. A. 《Doklady Earth Sciences》2021,501(2):1065-1068

Doklady Earth Sciences - A series of experiments are carried out with a stick–slip earthquake model consisting of two granite blocks under biaxial compression loading. The mechanical...  相似文献   

Silicate globules in kyanite from grospydites of the Zagadochnaya kimberlite pipe,Yakutia: The problem of the origin     

Tomilenko  A. A.  Kovyazin  S. V.  Pokhilenko  L. N.  Sobolev  N. V. 《Doklady Earth Sciences》2011,436(1):98-101

The results of complex study of silicate globules and α-quartz paramorphs after coesite in kyanite from grospydites from the Zagadochnaya kimberlite pipe, Yakutia, using optical and scanning electron spectroscopy, electron and ion microprobes, LA ICP MS and Raman spectroscopy, are presented. The existence of radial fractures diverging from silicate globules into the matrix (kyanite) attests to the fact that the content of the globules is extremely condensed. A zonal structure is usually typical for globules: a coat and a core, which can be explicitly distinguished under the electron microscope, can be differentiated in them. Compositionally, the coat of the globule corresponds to potassium feldspar (wt %: 66.4 SiO₂; 16.9 Al₂O₃; 0.4 FeO; 0.1 CaO; 0.2 Na₂O; 14.7 K₂O). The globules were also detected in which along with K, a high content of Na and Ca was also ascertained in the silicate coat. The globule coat is considerably enriched with Ba, La, Ce, Nb, and a number of other noncompatible elements as compared with xenolith minerals. The water content in globules is ∼0.6 wt %. As compared with the host mineral (kyanite), the core part of the globules is also enriched with Co, Ni, Zn, and Cu; their content in kyanite is negligibly low. The entire data collection attests to the fact that the formation of silicate globules could have been caused by interaction of the conservated fluid and/or water-silicate melt with the host mineral and crystalline inclusions of clinopyroxene and garnet with decreasing pressure during the transportation of grospydite xenoliths by the kimberlite melt to the Earth’s surface.  相似文献   

Conditions of carbonation and wehrlitization of lithospheric peridotite upon interaction with carbonatitic melts     

A. G. Sokol  A. N. Kruk  D. A. Chebotarev  Yu. N. Palyanov  N. V. Sobolev 《Doklady Earth Sciences》2015,465(2):1262-1267

Study of the mechanism of carbonation and wehrlitization of harzburgite upon metasomatism by carbonatitic melts of various genesis was carried out. Experiments with durations of 60–150 h were performed at 6.3 GPa and 1200°C. The data showed that carbonatite with MgO/CaO > 0.3 percolating into the peridotitic lithosphere may provide crystallization of magnesite in it. The influence of all studied carbonatites results in wehrlitization of peridotite. The compositions of melts formed by interaction with harzburgite (～2 wt % SiO₂, Ca# = 36–47) practically do not depend on the composition of the initial carbonatite. Based on the data obtained, we conclude that the formation of magnesite-bearing and magnesite-free metasomatized peridotites may have a significant influence on the CO₂ regime in the further generation of kimberlitic magmas of groups I and II.  相似文献   

Introduction to a special issue of Izvestiya,Physics of the Solid Earth Journal     

G. A. Sobolev  V. S. Kuksenko  A. D. Zavyalov 《Izvestiya Physics of the Solid Earth》2011,47(10):857-858

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Database of molecular masers and variable stars     

Andrej M.Sobolev  Dmitry A.Ladeyschikov  Jun-ichi Nakashima 《天文和天体物理学研究(英文版)》2019,(3)

We present the database of maser sources in H2 O, OH and Si O lines that can be used to identify and study variable stars at evolved stages. Detecting the maser emission in H2 O, OH and Si O molecules toward infrared-excess objects is one of the methods for identifing long-period variables(LPVs, including miras and semiregulars), because these stars exhibit maser activity in their circumstellar shells. Our sample contains 1803 known LPV objects. Forty-six percent of these stars(832 objects) manifest maser emission in the line of at least one molecule: H2 O, OH or Si O. We use the database of circumstellar masers in order to search for LPVs which are not included in the General Catalogue of Variable Stars(GCVS). Our database contains 4806 objects(3866 objects without associations in GCVS) with maser detection in at least one molecule. Therefore it is possible to use the database in order to locate and study the large sample of LPV stars. The database can be accessed at http://maserdb.net.  相似文献   

Low-Titanium Lamproites of the Ryabinoviy Massif (Aldan Shield): Crystallization Conditions and Lithospheric Source     

I. F. Chayka  A. E. Izokh  A. V. Sobolev  V. G. Batanova 《Doklady Earth Sciences》2018,481(2):1008-1012

Obtained data shows that high-potassic dyke rocks of the Ryabinoviy massif (Central Aldan) belong to low-titanium lamproite series (Mediterranean type) and are distinct with “classic” high-titanium lamproites. Based on Al-in-olivine thermometer, temperature of olivine–chrome-spinel pair crystallization varies in range between 1100 and 1250°C. This suggests lithospheric mantle source for the parental melt and makes role of mantle plume insignificant. High-precision data on olivine composition and bulk rock traceelement composition imply mixed source for the parental melt, consisted of depleted peridotite and enriched domains, originated during ancient subduction.  相似文献   

Formation of Water-Bearing Defects in Olivine in the Presence of Water–Hydrocarbon Fluid at 6.3 GPa and 1200°C     

A.?G.?SokolEmail author  I.?N.?Kupriyanov  A.?A.?Tomilenko  T.?A.?Bul’bak  Yu.?N.?Palyanov  N.?V.?Sobolev 《Doklady Earth Sciences》2018,483(1):1451-1453

The main trends of water dissolution in Fe-bearing olivine have been investigated in the olivine–H₂O–hydrocarbon fluid system in experiments at a pressure of 6.3 GPa, a temperature of 1200°C, and hydrogen fugacity ( fH₂) buffered by the Mo–MoO₂ equilibrium. The content and contribution of ОH defects of different types in Fe-bearing olivines depend on the composition of reduced fluids in the system. As the fraction of hydrocarbons in the fluid increases, the H₂O content in olivine crystals decreases from 900 to 160–180 ppm, while the ОН absorption peaks become lower at high frequencies and occupy a larger part of the infrared spectrum in the low-frequency region. According to the experimental results, even the deepest seated mantle olivines with OH defects were not equilibrated with a fluid rich in light alkanes or oxygenated hydrocarbons.  相似文献   

Genesis of Diamond in Metal–Carbon and Metal–Sulfur–Carbon Melts: Evidence from Experimental Data     

Zhimulev  E. I.  Chepurov  A. I.  Sobolev  N. V. 《Doklady Earth Sciences》2018,483(1):1473-1474

Doklady Earth Sciences - The experimental data on diamond growth in the Fe–Ni–S–C and Fe–S–C systems with a sulfur content of 5–14 wt % at 5.5 GPa and...  相似文献   

Biostratigraphy and Sedimentary Settings of the Middle Devonian Succession of the Yuryung-Tumus Peninsula,Khatanga Gulf of the Laptev Sea     

N. V. Sennikov  T. A. Shcherbanenko  I. V. Varaksina  N. G. Izokh  E. S. Sobolev  A. Yu. Yazikov 《Stratigraphy and Geological Correlation》2018,26(3):267-282

The age of the Paleozoic sedimentary successions of the Yuryung-Tumus Peninsula in the Khatanga Gulf is determined as Middle Devonian, late Eifelian, and the beginning of the early Givetian on the basis of the study of brachiopods, ammonoids, nautiloids, bactritoids, gastropods, and conodonts, and in the terminology of the standard conodont succession, these deposits are not older than the late Eifelian Tortodus kockelianus Zone, but include the terminal Eifelian Polygnathus ensensis Zone and the first Givetian Polygnathus hemiansatus Zone and are no younger than the beginning of the early Givetian Polygnathus varcus Zone. The Middle Devonian sedimentary successions of the Yuryung-Tumus Peninsula show the level of the global sedimentary Ka?ak Event. The areas of distribution of the Devonian sedimentary deposits in the Yuryung-Tumus Peninsula in the Khatanga Gulf should be considered as one of the fragments of the regional geological structures of a remote (isolated?) region of the Taymyr Fold System rather than a component of the structures of the northern Siberian Platform.  相似文献