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Journal of Geographical Sciences - This article describes the lake basins of the Jom-Bolok volcanic region in the East Sayan (the largest manifestation of the Holocene eruptions in Central Asia).... 相似文献
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Shchetnikov A. A. Bezrukova E. V. Kerber E. V. Belozerova O. Yu. Kuzmin M. I. Ivanov E. V. Krainov M. A. Filinov I. A. Nechaev I. O. 《Doklady Earth Sciences》2019,486(1):503-506
Doklady Earth Sciences - The first results of tephrochronological studies of Late Pleistocene–Holocene volcanic eruptions in the Zhom-Bolok River valley (Eastern Sayan) are reported. Based on... 相似文献
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Tselmovich V. A. Kurazhkovskii A. Yu. Kazansky A. Yu. Shchetnikov A. A. Blyakharchuk T. A. Philippov D. A. 《Izvestiya Physics of the Solid Earth》2019,55(3):517-527
Izvestiya, Physics of the Solid Earth - Peat cores sampled from different climatic zones are studied. The petromagnetic and microprobe methods are used to find peat layers enriched with cosmic... 相似文献
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D. M. Pechersky A. Yu. Kazanskii G. P. Markov V. A. Tselmovich A. A. Shchetnikov 《Izvestiya Physics of the Solid Earth》2018,54(1):106-120
The native iron particles that were previously detected by thermomagnetic and microprobe analyses in the sediments of different age in many regions of the world are of extraterrestrial origin. The similarity in the compositions, grain shapes, and sizes observed in the extraterrestrial and terrestrial particles of native iron testifies to the common production conditions of iron particles during the formation of planets. In this paper, the single finding of terrestrial iron in the lacustrine sediments of the Zhombolok volcanic region, East Sayan, is discussed. The uniqueness of the results indicates that the spatial distribution of the particles of native iron is limited to a fairly narrow area around their source—volcanic eruption or/and the fall of a large meteorite. 相似文献
5.
A. Yu. Kazanskii G. G. Matasova A. A. Shchetnikov I. A. Filinov V. V. Chegis 《Izvestiya Physics of the Solid Earth》2017,53(5):783-794
The results of rock magnetic studies in four subaeral cis-Baikalian sections of different ages and geneses are described in detail. The similarities and distinctions in the formation of the magnetic properties of the sediments are established based on the analysis of the magnetic hysteresis parameters. The mechanisms responsible for the dissimilarity of the magnetic characteristics of the rocks in the different sections are identified. The variations in the composition, concentration, and particle size of the grains of magnetic fraction as a function of climate, geomorphologic factors, and volcanism are demonstrated. 相似文献
6.
Examples of the geological and geomorphic framework of river valleys in the Tunka rift basin (Baikal rift system) and in the Irkutsk amphitheater (Siberian craton) have been used to show that horizontal and vertical motions of tectonic units in southern East Siberia are superposed with periodic movements. In the latter, the waves of slow uplift are attendant with erosional incision events, whereas during the subsidence cycles the incised valleys become filled with mainly alluvial sediments. The latest incision events in the area occurred in the past 70 kyr. 相似文献
7.
E.G. Vologina M. Sturm Ya.B. Radziminovich S.S. Vorob'eva A.A. Shchetnikov 《Russian Geology and Geophysics》2012,53(12):1342-1350
Large earthquakes took place in southern Cisbaikalia in the first half of 1912. They might have caused a mass release of gas (methane?) into the water column of Lake Baikal and the atmosphere near Sharyzhalgai station of the Circum-Baikal Railroad. This phenomenon was observed in August 1912 by the residents as rising water columns several meters high and reported in the regional press.To find traces of this event, core was recovered from bottom sediments at a depth of 1300 m in winter 2010. The depth interval 1–8.7 cm is a homogeneous layer, no more than 100 years old (210Pb dating). The sediments here are poor in SiO2biog but richer in Corg than the underlying sediments. Also, they are marked by a considerable content of terrestrial plant remains, a lower content of planktonic diatoms, and higher contents of benthic and ancient diatoms. These data indicate that the layer under study formed as a result of the 1912 earthquake, with a considerable contribution from the littoral and shallow-water zones of Lake Baikal. 相似文献
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We discuss historical evidence for seismicity on the southern margin of the Siberian craton collected from old local newspapers. The reported earthquakes vary in magnitude from M = 2.5 to 4.5, and their macroseismic locations agree well with the regional tectonic framework. The new data prove seismic activity in the area and can be used in seismic risk assessment. 相似文献
10.
E. V. Bezrukova A. A. Shchetnikov M. I. Kuzmin O. G. Sharova N. V. Kulagina P. P. Letunova E. V. Ivanov M. A. Kraynov E. V. Kerber I. A. Filinov O. V. Levina 《Doklady Earth Sciences》2016,468(1):527-531
This paper considers the results of comprehensive lithological, biostratigraphic, and geochemical investigation of sediments in Khara-Nur Lake (Eastern Sayan Mountains) situated in the area of the greatest Holocene eruptions in the Central Asia Region. The age of the basal sediment layer is estimated at 6881 ± 53 years. The local natural environment and climate have undergone great changes since that time. The Holocene volcanic events did not exert a catastrophic impact on the regional landscape, but they caused dramatic changes in the local vegetation. The well-defined correlation of the regional events with the well-known records of the natural environment in the Northern Hemisphere is indicative of the decisive influence of global atmospheric circulation on restructuring the landscape and climate system in the Zhom-Bolok Region in the Middle–Late Holocene. 相似文献