The first U–Pb geochronological and geochemical data on Late Vendian and Early Paleozoic acid volcanic rocks of the Mamyn Terrane (Central Asian Fold Belt)     

A. A. Sorokin  N. M. Kudryashov 《Doklady Earth Sciences》2015,465(2):1237-1242

The first results of U–Pb geochronological studies of acid volcanic rocks from the Oktyabrsk Complex of the Mamyn Terrane, which had previously been conventionally attributed to the Late Proterozoic, are reported. It is established that rhyodacite of the Gar’–Dzheltulak volcanic field has Late Vendian age (546 ± 14 Ma) and trachyrhyodacite of the Kosmatinsk field has Late Cambrian age (490 ± 2 Ma). As a whole, the data obtained indicate two stages of acid volcanism on the Mamyn Terrane of the eastern part of the Central Asian Fold Belt covering the boundary between the Paleozoic and Neoproterozoic, as well as the Late Cambrian. Based on the geochemical peculiarities of rocks, it may be assumed that the early stage of volcanism was controlled by subduction, whereas the late stage was governed by riftogenic processes.  相似文献   

Sources of the Jurassic terrigenous rocks of the Upper Amur and Zeya–Dep troughs of the eastern part of the Central Asian fold belt: Results of Sm–Nd isotopic–geochemical and U–Pb (LA-ICP-MS) geochronological studies     

Yu. N. Smirnova  A. A. Sorokin  A. B. Kotov  V. P. Kovach 《Doklady Earth Sciences》2015,465(2):1224-1228

The results of U–Pb geochronological studies of detrital zircons and Sm–Nd isotopic–geochemical studies of terrigenous rocks of the Upper Amur and Zeya–Dep troughs indicate that the beginning of orogenic processes, which led to the formation of the Mongol–Okhotsk fold belt, occurred in the Early Jurassic.  相似文献   

Generation of Geomagnetic Disturbances in the Ionosphere by a Tsunami Wave     

Sorokin  V. M.  Yashchenko  A. K.  Surkov  V. V. 《Geomagnetism and Aeronomy》2019,59(2):221-233

Geomagnetism and Aeronomy - The mechanism of the generation of the geomagnetic field disturbance accompanying tsunami wave propagation is considered. Electric currents in the marine environment and...  相似文献   

Age of the Ust’-Gilyui sequence in the Stanovoi Complex of the Selenga-Stanovoi Superterrain, Central Asian fold belt     

S. D. Velikoslavinskii  A. B. Kotov  E. B. Salnikova  A. M. Larin  A. A. Sorokin  A. P. Sorokin  V. P. Kovach  E. V. Tolmacheva  S. Z. Yakovleva  I. V. Anisimova 《Doklady Earth Sciences》2012,444(2):661-665

According to the results of U-Pb geochronological investigations, the age of the amphibolite protoliths (metabasalts) in the Ust??-Gilyui sequence within the Stanovoi Complex of the Amazar-Gilyui structural and formational zone in the Selenga-Stanovoi Superterrain of the Central Asian fold belt can be estimated at 193 ± 1 Ma. The Nd model age of the Ust??-Gilyui metasedimentary rocks is in the interval of t _Nd(DM) = 1.1?C3.1 Ga. This information along with the previously obtained geochronological data are indicative of the fact that the Ust??-Gilyui sequence consists of metasedimentary and metavolcanic rocks of various ages: (1) volcanic rocks with the age of 193 ± 1 Ma; (2) metasedimentary and metavolcanic rocks broken through by the Paleozoic granitoids dated to 370 Ma and characterized by minimum estimations of t _Nd(DM) = 1.1 Ga, i.e., rocks with an age of 1.1?C0.4 Ga. In addition, it is quite possible that this sequence also includes more ancient rocks. The SSS Amazar-Gilyui structural and formational zone is likely to be a tectonic mélange composed of the metasedimentary and metavolcanic rocks of the Mesozoic and, probably, Paleozoic and Early Precambrian ages. The studied zone was formed in the Mesozoic, most likely, in the course of the collision processes initiated by the closing up of the Mongol-Okhotsk Ocean.  相似文献   

The largest recent earthquake in the Upper Amur region on October 14, 2011: First results of multidisciplinary study     

A. I. Khanchuk  D. A. Safonov  Ya. B. Radziminovich  N. S. Kovalenko  A. V. Konovalov  N. V. Shestakov  V. G. Bykov  M. A. Serov  A. A. Sorokin 《Doklady Earth Sciences》2012,445(1):916-919

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Sources of the Late Mesozoic magmatic associations in the northeastern part of the Amurian microcontinent     

A. A. Sorokin  A. B. Kotov  V. P. Kovach  V. A. Ponomarchuk  V. M. Savatenkov 《Petrology》2014,22(1):65-76

Based on generalization of available geochronological data, Late Mesozoic magmatic associations in the northeastern part of the Amurian microcontinent are divided into three groups: 142–125, 124–115, and <110 Ma. The age of these associations decreases with approaching the Pacific margin of Asia. In the same direction, they show a change in sources of their parental melts: continental crust (142–125 Ma) → continental crust + PREMA (DM) (124–115 Ma) → continental crust + PREMA (DM) + EMII (<110 Ma). Isotope-geochemical (Sr-Nd) study indicates that intrusive and volcanic rocks of the Late Mesozoic magmatic associations in the northeastern part of the Amurian microcontinent were originated in geodynamic settings that provided access of enriched mantle sources to magma formation. The most probable of these settings are as follows: (1) plate sliding accompanying by the formation of slab window beneath continental margin; (2) passage of the Asian margin over the East Asian mantle hot field in the Late Mesozoic; (3) asthenospheric upwelling due to delamination of the lower crust during closure of the Mongolian-Okhotsk ocean caused by collision between the Amurian microcontinent, Dzhugdzhur-Stanovoy, and Selenga-Stanovoy superterranes in the Central Asian fold belt.  相似文献   

Organic matter of oceanic sediments in the system of convective mass transfer in the lithosphere     

I. F. Savchenko  A. P. Sorokin  N. I. Belozerov  I. V. Girenko 《Doklady Earth Sciences》2014,458(1):1136-1138

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New 40Ar/39Ar age of granitic rocks and related gold mineralization at the Kirovskoye deposit (southeastern margin of the North Asian craton)     

A. A. Sorokin  A. V. Ponomarchuk  A. V. Travin  V. A. Ponomarchuk  K. D. Vakhtomin 《Doklady Earth Sciences》2014,458(2):1230-1235

The Kirovskoye gold deposit located in the southern part of the Selenga-Stanovoi superterrane at the southeastern margin of the Siberian craton is one of the largest ore deposits in the eastern regions of the Russian Far East. ⁴⁰Ar/³⁹Ar geochronological studies revealed that the age of the quartz-diorite-porphyrite and granodiorite-porphyry dikes is 128?126 Ma. This estimate agrees with the previous U-Pb age of 125 ± 2 Ma for the Dzhalinda granodiorites. The age of hydrothermal ore-forming processes was estimated at ～121?120 Ma. These results allow us to infer that a relationship between Kirovskoye gold mineralization was formed as a result of postmagmatic hydrothermal activity, which accompanied the emplacement of the Dzhalinda intrusion and coeval dikes.  相似文献   

Areas and sources of Paleozoic metaterrigenous rocks of the Yankan terrane in the Mongolia-Okhotsk foldbelt: Evidence from the Sm-Nd isotope-geochemical studies     

A. A. Sorokin  A. A. Kolesnikov  A. B. Kotov  V. P. Kovach 《Doklady Earth Sciences》2014,454(2):204-207

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Geochemistry and tectonic depositional settings of Jurassic terrigenous sediments in the Upper Amur and Zeya-Dep troughs of the Eastern Central Asia fold belt     

Yu. N. Smirnova  A. A. Sorokin  L. I. Popeko 《Doklady Earth Sciences》2014,454(2):114-117

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