Доклады Академии наук最新文献

Dissolution of pyrochlore and microlite in alkaline, sub-aluminous and high-aluminous granitoid melts 焦绿石和微石在碱性、亚铝和高铝花岗岩类熔体中的溶解

Доклады Академии наук Pub Date : 2019-12-23 DOI: 10.31857/s0869-56524896626-630

V. Chevychelov, A. A. Virus, Y. Shapovalov

引用次数: 0

Cyclic structure of the isotopic diagram of the lithalsa and its radiocarbon age, Sentsa River valley, Eastern Sayan 萨延东部圣淘河流域岩石层旋回结构及其放射性碳年龄

Доклады Академии наук Pub Date : 2019-12-20 DOI: 10.31857/s0869-56524895506-511

Y. Vasil'chuk, J. Vasil’chuk, S. Alexeyev, N. Budantseva, L. P. Alexeyeva, A. Vasil'chuk, Ye. A. Kozyreva, A. A. Svetlakov

{"title":"Cyclic structure of the isotopic diagram of the lithalsa and its radiocarbon age, Sentsa River valley, Eastern Sayan","authors":"Y. Vasil'chuk, J. Vasil’chuk, S. Alexeyev, N. Budantseva, L. P. Alexeyeva, A. Vasil'chuk, Ye. A. Kozyreva, A. A. Svetlakov","doi":"10.31857/s0869-56524895506-511","DOIUrl":"https://doi.org/10.31857/s0869-56524895506-511","url":null,"abstract":"The lithalsa, located on the first terrace of the Sentsa River in Okinsky district of the Republic of Buryatia, were studied. The most typical features of isotopic diagrams, obtained from the ice core from the 20-meter borehole, is their stage structure: three isotope minima at depths of approximately: 3-5, 9-12, and 18-21 m are separated by two distinct isotope maxima. Most likely, this is due to the cycle of the triple flooding of the growing permafrost mound and the subsequent active evaporation of the lake water - the main source of water in the ice core of lithalsa. Based on the detailed radiocarbon dating of organic material from the upper layers of the highest and surrounding lithalsas, the time of their formation was established. The active accumulation of organic material in dried heaving soils occurred from 0,5 to 0,2 ka BP. This is the time of the beginning of the formation of permafrost, active ice formation and the associated heaving process and lithalsa growth. The age of at least 3 of 4 studied mounds is not older than 200 years, it coincides with the cooling in the early 19th century.","PeriodicalId":24047,"journal":{"name":"Доклады Академии наук","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91226346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Source of megaampere current with the rise time ∼100 ns on the basis of explosive magnetic generator 在爆炸磁发生器的基础上产生上升时间为~ 100ns的兆安电流源

Доклады Академии наук Pub Date : 2019-12-10 DOI: 10.31857/s0869-56524894355-357

A. A. Bazanov, А А Базанов, E. Bochkov, Е И Бочков, S. G. Garanin, Сергей Григорьевич Гаранин, P. Duday, П. В. Дудай, A. A. Zimenkov, А. А. Зименков, A. Ivanovskiy, А. В. Ивановский, K. N. Klimushkin, К Н Климушкин, V. M. Komarov, Владимир Михайлович Комаров, A. I. Krayev, А. И. Краев, V. B. Kudel’kin, В. Б. Куделькин, V. Mamyshev, В И Мамышев, S. M. Polyushko, С. М. Полюшко, Z. S. Tsibikov, З С Цибиков, E. V. Shapovalov, Е В Шаповалов

{"title":"Source of megaampere current with the rise time ∼100 ns on the basis of explosive magnetic generator","authors":"A. A. Bazanov, А А Базанов, E. Bochkov, Е И Бочков, S. G. Garanin, Сергей Григорьевич Гаранин, P. Duday, П. В. Дудай, A. A. Zimenkov, А. А. Зименков, A. Ivanovskiy, А. В. Ивановский, K. N. Klimushkin, К Н Климушкин, V. M. Komarov, Владимир Михайлович Комаров, A. I. Krayev, А. И. Краев, V. B. Kudel’kin, В. Б. Куделькин, V. Mamyshev, В И Мамышев, S. M. Polyushko, С. М. Полюшко, Z. S. Tsibikov, З С Цибиков, E. V. Shapovalov, Е В Шаповалов","doi":"10.31857/s0869-56524894355-357","DOIUrl":"https://doi.org/10.31857/s0869-56524894355-357","url":null,"abstract":"To achieve a thermonuclear ignition threshold in the scheme of indirect irradiation of Z‑pinch by X‑radiation, it is necessary to implode the liner by the current with the amplitude 65 МА for the time 100 ns. The currents with such parameters can be achieved with the use of super-power disk explosive magnetic generators and a two-stage current pulse sharpening system based on foil electrically exploded current opening switches in a form of a serpentine. The implementation of the explosive current source with a rise time of 100 ns is advisable to be carried out in stages by increasing the magnitude of current. The results of the first-stage experiments, in which the current with the amplitude of 5 MA was produced on the basis of the helical explosive magnetic generator in the load of 10 nH for the time of 110 ns, are presented.","PeriodicalId":24047,"journal":{"name":"Доклады Академии наук","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73155606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Initiation of kerosene combustion in supersonic air flow by a package of gas-dynamic pulses 一组气体动力脉冲在超音速气流中引发煤油燃烧

Доклады Академии наук Pub Date : 2019-11-29 DOI: 10.31857/s0869-56524893250-253

P. Tretyakov

引用次数: 3

Relationship between magmatic, metamorphic and hydrothermal processes within the Baikal-Muya terrane (Eastern Siberia): constraints from a high-precision geochronological study of the Kedrovsky granitoid massif 东西伯利亚贝加尔湖-穆亚地块岩浆、变质和热液作用的关系:来自Kedrovsky花岗岩地块高精度年代学研究的约束

Доклады Академии наук Pub Date : 2019-11-29 DOI: 10.31857/s0869-56524893292-297

A. Chugaev, I. Chernyshev, E. Rytsk, E. Salnikova, A. Nosova, A. Travin, A. Kotov, A. Fedoseenko, I. V. Anisimova

{"title":"Relationship between magmatic, metamorphic and hydrothermal processes within the Baikal-Muya terrane (Eastern Siberia): constraints from a high-precision geochronological study of the Kedrovsky granitoid massif","authors":"A. Chugaev, I. Chernyshev, E. Rytsk, E. Salnikova, A. Nosova, A. Travin, A. Kotov, A. Fedoseenko, I. V. Anisimova","doi":"10.31857/s0869-56524893292-297","DOIUrl":"https://doi.org/10.31857/s0869-56524893292-297","url":null,"abstract":"High-precision dating of granitoids is significant for identification the ages of the main stages of crust formation in various blocks of the continental crust. In this work, we dating the Kedrovskiy diorite-granodiorite massif localized within the South Muya block of the Baikal-Muya accretion terrane (BMT) (Eastern Siberia) among the Neoproterozoic gabbroids of the Kedrovskiy complex and metasedimentary rocks of the Kedrovskaya Formation. The results of U-Pb (ID TIMS) and 39Ar-40Ar geochronological studies of the Kedrovskiy massif are discussed. The formation of the massif (781 3 Ma) occurred at an early stage formation of the Proterozoic continental crust of BMT during accretion of Baikalids with the Siberian craton. A later thermal event (626 11 Ma) of the Ediacaran stage evolution BMT is reflected in the formation of of biotite-quartz-feldspar veins that cut through the granitoids of the Kedrovka massif. The obtained geochronological data show that the gold mineralization of the Kedrovskiy deposit (273 4 Ma) was not generated by the Kedrovskiy massif granitoids.","PeriodicalId":24047,"journal":{"name":"Доклады Академии наук","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79724917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pyrogenic nature reservoir rocks as a factor of geofluidodynamic inhomogeneity 热生型天然储层岩作为地球流体动力学不均匀性的一个因素

Доклады Академии наук Pub Date : 2019-11-29 DOI: 10.31857/s0869-56524893277-280

L. Abukova, I. F. Yusupova

{"title":"Pyrogenic nature reservoir rocks as a factor of geofluidodynamic inhomogeneity","authors":"L. Abukova, I. F. Yusupova","doi":"10.31857/s0869-56524893277-280","DOIUrl":"https://doi.org/10.31857/s0869-56524893277-280","url":null,"abstract":"The article considers the Kansko-Achinsky brown coal basin. Huge reserves of solid organic matter (OM) are concentrated in еру Jurassic age sandy-clay sediments. For example, the average thickness of the Borodino field Itatsky layer is 51 m. Attention is drawn to the paleo-centers of heat generation where the coal layers lost (in a whole or partly) their OM. They were destroyed by the underground fires of the past eras. The loss of large masses of the OM in local areas was accompanied by deformations of the coal layers (as well as overlapping ones), appearance of burned and caved ground, failure topographic form (subsidence, funnels, bolsons), and most importantly, the formation of epigenetic cavernosity and pyrogenic reservoir rocks. It is emphasized that the increased fluid conductivity of burned rocks has survived up to the present days. The areas with the burnt rocks are separated into independent fluid dynamic structures with their own parameters (filtration coefficient, water transmissibility, etc.). It has been suggested that pyrogenic reservoir rocks could occur in oil-and-gas basins with coal shale deposits at certain stages of geological development, and at the oil-and-gas generating depths they are able to become reservoirs of catagenic hydrocarbons.","PeriodicalId":24047,"journal":{"name":"Доклады Академии наук","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72589423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

U-Pb age of sphene grains, petrochemical, mineralogical and geochemical features of alkaline rocks of the Bogdo complex (Arctic Siberia) 西伯利亚北极博格多杂岩碱性岩的榍石颗粒U-Pb年龄、石化、矿物学和地球化学特征

Доклады Академии наук Pub Date : 2019-11-29 DOI: 10.31857/s0869-56524893281-285

N. Dobretsov, S. Zhmodik, E. Lazareva, A. Tolstov, D. Belyanin, O. N. Surkov, N. Dobretsov, N. Rodionov, S. Sergeev

{"title":"U-Pb age of sphene grains, petrochemical, mineralogical and geochemical features of alkaline rocks of the Bogdo complex (Arctic Siberia)","authors":"N. Dobretsov, S. Zhmodik, E. Lazareva, A. Tolstov, D. Belyanin, O. N. Surkov, N. Dobretsov, N. Rodionov, S. Sergeev","doi":"10.31857/s0869-56524893281-285","DOIUrl":"https://doi.org/10.31857/s0869-56524893281-285","url":null,"abstract":"In the north of the Siberian Platform, east of the Anabar Shield, several identified massifs of alkaline rocks with carbonatites are known: Tomtorsky, Bogdo, Promezhutochniy, as well as Bualkalakh, Chuempe, Uele, which are projected according to geophysical data and forming a large alkaline-carbonatite province. The first data on the composition of alkaline rocks of the Bogdo massif were obtained, which correspond to a group of feldspathic rocks of the main composition: rischorrites, biotite-aegirine libenerite syenites, carbonatized, with symplectites and nepheline-feldspar aggregates, pseudo-leucite nepheline syenites. Sphenes were extracted from various types of rocks of the Bogdo massif and their U-Pb age was determined using the SHRIMP-II secondary-ion microprobe. The calculated U-Pb age corresponds to 394,4 3,2 Ma, which is close to the age stage established for the Tomtor massif and the age of the rocks of the Kola alkaline province. One of the reasons for the manifestation of alkaline plume magmatism in this territory may be the influence of the peripheral zone Africa Large Low Shear Velocity Province (Tuzo) in the Baltic and Siberia during the Devonian era.","PeriodicalId":24047,"journal":{"name":"Доклады Академии наук","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85521624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On a characterization theorem on a-adic solenoids 关于进形螺线管的一个表征定理

Доклады Академии наук Pub Date : 2019-11-29 DOI: 10.31857/s0869-56524893227-231

G. Feldman

引用次数: 0

Dyke magmatism in the evolution of the transform active continental margin of the Siberian Craton in the Ediacaran 埃迪卡拉纪西伯利亚克拉通改造活动大陆边缘演化中的岩脉岩浆作用

Доклады Академии наук Pub Date : 2019-11-29 DOI: 10.31857/s0869-56524893267-271

A. Vernikovskaya, V. Vernikovsky, N. Matushkin, P. I. Kadilnikov, D. Metelkin, Z. Li, S. Wilde, I. Romanova, E. Bogdanov

引用次数: 0

New views about the Sizim suite (Lower Permian, the Polar Urals) 西齐姆组(极地乌拉尔地区下二叠统)新认识

Доклады Академии наук Pub Date : 2019-11-10 DOI: 10.31857/s0869-5652489153-56

N. Inkina, Н С Инкина

引用次数: 0