Pub Date : 2019-12-23DOI: 10.31857/s0869-56524896626-630
V. Chevychelov, A. A. Virus, Y. Shapovalov
The represented experimental data on the Ta and Nb contents in acidic magmatic melts of different compositions, when dissolving pyrochlore and microlite at T = 650850 C and P = 100400 MPa, make it possible to obtain quantitative characteristics to create physico-chemical models of the genesis of TaNb deposits. At pyrochlore dissolution in granitoid melts at P = 100 MPa, the highest Nb content (0,71,9 wt.%) is obtained in alkaline melts, it decreases to 0,060,38 wt.% in sub-aluminous melts, and then slightly increases to 0,110,41 wt.% in high-alumina melts. An increase in temperature increases the dissolution of pyrochlore, and an increase in pressure decreases its. In high-alumina granite melts the pyrochlore is unstable. At the microlite dissolves with the increase in the alumina-rich melt, the Nb/Ta ratio in the melt increases approximately doubles.
{"title":"Dissolution of pyrochlore and microlite in alkaline, sub-aluminous and high-aluminous granitoid melts","authors":"V. Chevychelov, A. A. Virus, Y. Shapovalov","doi":"10.31857/s0869-56524896626-630","DOIUrl":"https://doi.org/10.31857/s0869-56524896626-630","url":null,"abstract":"The represented experimental data on the Ta and Nb contents in acidic magmatic melts of different compositions, when dissolving pyrochlore and microlite at T = 650850 C and P = 100400 MPa, make it possible to obtain quantitative characteristics to create physico-chemical models of the genesis of TaNb deposits. At pyrochlore dissolution in granitoid melts at P = 100 MPa, the highest Nb content (0,71,9 wt.%) is obtained in alkaline melts, it decreases to 0,060,38 wt.% in sub-aluminous melts, and then slightly increases to 0,110,41 wt.% in high-alumina melts. An increase in temperature increases the dissolution of pyrochlore, and an increase in pressure decreases its. In high-alumina granite melts the pyrochlore is unstable. At the microlite dissolves with the increase in the alumina-rich melt, the Nb/Ta ratio in the melt increases approximately doubles.","PeriodicalId":24047,"journal":{"name":"Доклады Академии наук","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80962914","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}
Pub Date : 2019-12-20DOI: 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
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.
研究人员研究了位于布里亚特共和国奥金斯基地区Sentsa河第一梯田上的lithalsa。从20米钻孔的冰芯中获得的同位素图最典型的特征是它们的阶段结构:3-5、9-12和18-21米深度的三个同位素极小值被两个不同的同位素极大值所分隔。最有可能的是，这是由于不断增长的永久冻土堆的三重洪水和随后的湖泊水的活跃蒸发的循环造成的——湖泊水是岩石区冰芯中的主要水源。根据对最高岩石层和周围岩石层上层有机物的详细放射性碳定年，确定了它们的形成时间。干隆起土有机质的主动积累发生在0.5 ~ 0.2 ka BP。这是永久冻土开始形成的时期，活跃的冰形成以及相关的起伏过程和岩石层的生长。被研究的4个土丘中，至少有3个的年龄不超过200年，与19世纪初的降温时间相吻合。
{"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":"25 1","pages":""},"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}
Pub Date : 2019-12-10DOI: 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
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.
{"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":"149 1","pages":""},"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}
Pub Date : 2019-11-29DOI: 10.31857/s0869-56524893250-253
P. Tretyakov
A technique has been proposed and the possibility of its realization for the initiation of kerosene combustion in supersonic air flow in part of the combustion chamber (CC) of a constant cross section has been confirmed. The intense combustion regime is realized with the use of a package of pulses of variable energy and is preserved at a switch-off of the action after the combustion arrangement in the CC diverging part.
{"title":"Initiation of kerosene combustion in supersonic air flow by a package of gas-dynamic pulses","authors":"P. Tretyakov","doi":"10.31857/s0869-56524893250-253","DOIUrl":"https://doi.org/10.31857/s0869-56524893250-253","url":null,"abstract":"A technique has been proposed and the possibility of its realization for the initiation of kerosene combustion in supersonic air flow in part of the combustion chamber (CC) of a constant cross section has been confirmed. The intense combustion regime is realized with the use of a package of pulses of variable energy and is preserved at a switch-off of the action after the combustion arrangement in the CC diverging part.","PeriodicalId":24047,"journal":{"name":"Доклады Академии наук","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74834301","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}
Pub Date : 2019-11-29DOI: 10.31857/s0869-56524893292-297
A. Chugaev, I. Chernyshev, E. Rytsk, E. Salnikova, A. Nosova, A. Travin, A. Kotov, A. Fedoseenko, I. V. Anisimova
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.
花岗岩类的高精度定年对于确定大陆地壳各块体主要地壳形成阶段的年龄具有重要意义。本文在新元古代的Kedrovskiy杂岩和Kedrovskaya组变质沉积岩中，确定了位于东西伯利亚贝加尔-Muya吸积地体(BMT)南Muya地块的Kedrovskiy闪长岩-花岗闪长岩地块。讨论了Kedrovskiy地块U-Pb (ID TIMS)和39Ar-40Ar年代学研究的结果。该地块的形成(781 - 3 Ma)发生在BMT元古界大陆地壳形成早期，与西伯利亚克拉通的贝卡利德增生。埃迪卡拉纪阶段演化BMT的晚热事件(626 - 11 Ma)反映在穿过Kedrovka地块花岗岩的黑云母-石英-长石脉的形成上。得到的年代学资料表明，Kedrovskiy矿床(274ma)的金成矿作用不是由Kedrovskiy地块花岗岩体产生的。
{"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":"25 1","pages":""},"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}
Pub Date : 2019-11-29DOI: 10.31857/s0869-56524893277-280
L. Abukova, I. F. Yusupova
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.
{"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":"56 1","pages":""},"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}
Pub Date : 2019-11-29DOI: 10.31857/s0869-56524893281-285
N. Dobretsov, S. Zhmodik, E. Lazareva, A. Tolstov, D. Belyanin, O. N. Surkov, N. Dobretsov, N. Rodionov, S. Sergeev
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.
{"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":"26 1","pages":""},"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}
Pub Date : 2019-11-29DOI: 10.31857/s0869-56524893227-231
G. Feldman
According to the Heyde theorem the Gaussian distribution on the real line is characterized by the symmetry of the conditional distribution of one linear form of independent random variables given the other. We prove an analogue of this theorem for linear forms of two independent random variables taking values in an -adic solenoid containing no elements of order 2. Coefficients of the linear forms are topological automorphisms of the -adic solenoid.
{"title":"On a characterization theorem on a-adic solenoids","authors":"G. Feldman","doi":"10.31857/s0869-56524893227-231","DOIUrl":"https://doi.org/10.31857/s0869-56524893227-231","url":null,"abstract":"According to the Heyde theorem the Gaussian distribution on the real line is characterized by the symmetry of the conditional distribution of one linear form of independent random variables given the other. We prove an analogue of this theorem for linear forms of two independent random variables taking values in an -adic solenoid containing no elements of order 2. Coefficients of the linear forms are topological automorphisms of the -adic solenoid.","PeriodicalId":24047,"journal":{"name":"Доклады Академии наук","volume":"389 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73425717","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}
Pub Date : 2019-11-29DOI: 10.31857/s0869-56524893267-271
A. Vernikovskaya, V. Vernikovsky, N. Matushkin, P. I. Kadilnikov, D. Metelkin, Z. Li, S. Wilde, I. Romanova, E. Bogdanov
An Ediacaran complex of dyke rocks has been identified for the first time in the Yenisei Ridge orogen. These igneous rocks are represented by basic, intermediate and acid variants and formed in the conditions of the transform active continental margin at the stages of its development before and during the interruption of subduction and slab breakoff: from dykes of the picrodolerite - dolerite-quartz diorite - leucogranite association with age in the range of 626-623 Ma (U-Th-U isotope data for zircons, SHRIMP-II method, this work) up to adakite - gabbro-anorthosite magmatism at the end of the Ediacaran.
在叶尼塞岭造山带首次发现了埃迪卡拉纪岩脉杂岩。这些火成岩以基性、中性和酸性变异体为代表，形成于大陆边缘在俯冲和板块断裂中断之前和期间的转化活动发育阶段的条件下。从年龄在626-623 Ma (SHRIMP-II方法中锆石的U-Th-U同位素数据)范围内的微白云岩-白云岩-石英闪长岩-浅花岗岩脉，到埃迪卡拉纪末期的埃克岩-辉长岩-斜长岩岩浆作用。
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Pub Date : 2019-11-10DOI: 10.31857/s0869-5652489153-56
N. Inkina, Н С Инкина
The article for the first time presents data on the material composition and structure of the Sezym Formation of the Lower Permian of the Western slope of the Polar Urals, which lies with stratigraphic disagreement on shallow medium-Carboniferous limestone and according to the overlapping deep-sea Artinian terrigenous deposits. New data are important for paleogeography and geodynamic reconstruction of the North-East of the European platform in the late Paleozoic.
{"title":"New views about the Sizim suite (Lower Permian, the Polar Urals)","authors":"N. Inkina, Н С Инкина","doi":"10.31857/s0869-5652489153-56","DOIUrl":"https://doi.org/10.31857/s0869-5652489153-56","url":null,"abstract":"The article for the first time presents data on the material composition and structure of the Sezym Formation of the Lower Permian of the Western slope of the Polar Urals, which lies with stratigraphic disagreement on shallow medium-Carboniferous limestone and according to the overlapping deep-sea Artinian terrigenous deposits. New data are important for paleogeography and geodynamic reconstruction of the North-East of the European platform in the late Paleozoic.","PeriodicalId":24047,"journal":{"name":"Доклады Академии наук","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81687149","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}
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