east siberia
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2022 ◽  
Vol 65 ◽  
pp. 101388
Author(s):  
Anna Marie Prentiss ◽  
Matthew J. Walsh ◽  
Erik Gjesfjeld ◽  
Megan Denis ◽  
Thomas A. Foor

2021 ◽  
pp. M57-2021-29
Author(s):  
A.K. Khudoley ◽  
S.V. Frolov ◽  
G.G. Akhmanov ◽  
E.A. Bakay ◽  
S.S. Drachev ◽  
...  

AbstractAnabar-Lena Composite Tectono-Sedimentary Element (AL CTSE) is located in the northern East Siberia extending for c. 700 km along the Laptev Sea coast between the Khatanga Bay and Lena River delta. AL CTSE consists of rocks from Mesoproterozoic to Late Cretaceous in age with total thickness reaching 14 km. It evolved through the following tectonic settings: (1) Meso-Early Neoproterozoic intracratonic basin, (2) Ediacaran - Early Devonian passive margin, (3) Middle Devonian - Early Carboniferous rift, (4) late Early Carboniferous - latest Jurassic passive margin, (5) Permian foreland basin, (6) Triassic to Jurassic continental platform basin and (7) latest Jurassic - earliest Late Cretaceous foreland basin. Proterozoic and lower-middle Paleozoic successions are composed mainly by carbonate rocks while siliciclastic rocks dominate upper Paleozoic and Mesozoic sections. Several petroleum systems are assumed in the AL CTSE. Permian source rocks and Triassic sandstone reservoirs are the most important play elements. Presence of several mature source rock units and abundant oil- and gas-shows (both in wells and in outcrops), including a giant Olenek Bitumen Field, suggest that further exploration in this area may result in economic discoveries.


2021 ◽  
Vol 7 ◽  
pp. 451-466
Author(s):  
Natalya V. Ovcharova ◽  
Nikolai B. Ermakov ◽  
Marina M. Silantyeva

The syntaxonomic analysis of pine forests with Acer negundo occurring on fluvio-glacial sandy deposits of Altai Krai (South-East Siberia) was made based on 93 releves. It was established that Acer negundo takes a different phytocenotic part in 2 associations, 2 variants, and 6 no-ranked communities of 4 classes and 4 orders according to the Braun-Blanquet approach. The method of detrended correspondence analysis (DCA coordination) implemented in the DECORANA software package was used to confirm the ecological and floristic integrity of the identified vegetation units. New data on the spatial syntaxa distributions depend on the complex humidity gradient, soil fertility, and anthropogenic factors. Acer negundo is most abundant and common in the communities of the Brachypodio-Betuletea pendulae class, which are characterized by habitats with moderate moistening and greater soil fertility. In the spatial series considered, according to the soil fertility and humidity gradients, we observe an increase in Acer negundo in the Vicia sylvatica – Pinus sylvestris community and an increase in the activity of mesophytes and mesohygrophytes that are more demanding to soil fertility.


2021 ◽  
Author(s):  
Irina A. Ponomareva

The book offers a detailed study of large corpus of rock art which is little known to an international audience. The book covers not only a huge region of East Siberia but also a period spanning from Late Paleolithic to the Iron Age, providing detailed accounts of the regional archaeology and rock art through the perspective of ethnicity, identity, and symbolism.


2021 ◽  
Vol 908 (1) ◽  
pp. 012016
Author(s):  
S Yu Gordeev ◽  
T V Gordeeva

Abstract Based on the studies conducted in 2012-2020 on the key plots of mixed fir tree woodlands that grow within the Ulan-Burgasy Mountain range, the authors identified a special nemoral group of lepidopterans, that typically inhabit ocean coastline mixed and broad-leaved forests. Another peculiarity of this area is the presence of species atypical for the major part of the Transbaikal Region: Spialia orbifer Hbn., Leucodonta bicoloria Den. et Schiff., Furcula bifida Brahm (Sub-boreal group); Laothoe populi L. (Central Palearctic group); and Feralia sauberi Graes. (Palearchearctic group). The comparison of Lepidoptera faunas on the key plots and other forest and forest-steppe habitats in the Transbaikal Region revealed their high similarity (more than 80%) to the Ulan-Burgasy humid forests that grow near Baikal and mixed fir tree taiga forests of the Khamar-Daban Ridge.


2021 ◽  
Author(s):  
Michail Shaldybin

Abstract Vast deposits of anhydrite and magnesite widely distributed in Ediacaran strata of East Siberia near the Riphean unconformity. Anhydrite-rich rocks are not look like of evaporitic origin find mostly nodules and the layers of chicken-wire structure otherwise disseminated as tiny sulfate forms amongst the terrigenous rocks. Here we propose an alternative point of view for anhydrite appearance – the enrichment of Sulphur because of the slashing increase the content of sulfur in the Ediacaran atmosphere due to high volcanic activity. It is suggested that the ancient Earth's atmosphere could have also been influenced by powerful sulfuric acid rains that eroded the Precambrian dolomites causing their aggressive degradation. Chemical reactions with dolomite and sulfuric acid showed that in the early stages an unstable phase of bassanite occur which later stabilized as anhydrite after its heating as an analogue of aging. Aggressive acids have caused global process of dolomite karstification of the Siberian craton with appearance in Ediacaran strata in addition to the sulfate phases, including magnesite and sulphurous phases of pyrite and barite.


2021 ◽  
Vol 12 (3S) ◽  
pp. 754-768
Author(s):  
Zh. V. Seminsky

This study aims to identify the groups of closely spaced mineral deposits located in the Southern East Siberia and to describe these clusters. The mineral resource base of this region includes the deposits of lead, zinc, tungsten, tin, molybdenum, uranium, copper, gold, lithium, tantalum, niobium, silver, fluorite, zirconium, rare-earth metals, iron, mica, precious and semi-precious stones, oil, gas, and coal. Many of these deposits contain a significant part of the explored mineral reserves of Russia. The deposits are located in the tectonic structures of the Siberian platform (Tunguska syncline, Nepa arch, Cheremkhovo and Priangarie depressions), as well as in the fold belts framing the platform from the south and southeast (Baikal-Patom, Dzhida-Vitim, etc.). These structures and belts formed under the influence of plate tectonic and plume tectonic processes. This article describes the clusters of mineral deposits of the Angara, Sayan, Baikal and Transbaikalia regions. Currently, the most developed are the clusters located in the southern part of the study area (Shilka, Argun, Yeravnino, etc.). In the northern part (Mama-Bodaibo, etc.), the clusters have been either partially developed within the existing mining areas or are at the initial stage of development. In these territories, the road infrastructure, power supply and other facilities required for mining industry are either underdeveloped or lacking. Prospects for the regional development are related to the economic development of the territories adjacent to the Baikal-Amur railroad (BAM) and hydrocarbons production in the zone near the East Siberia – Far East oil pipeline. On the Siberian platform, mineral deposits formed during the stages of formation of its basement (Aldan, Anabar, and Sharyzhalgai shields) and platform cover (Tunguska syncline, and Nepa-Botuoba anticline). Within the fold frame, ore formation was associated with subduction, spreading, collision, and plume tectonic intraplate settings. To start the development of small-size deposits and mining of technogenic raw materials, it is advisable to establish exploration and production enterprises that can operate and manage expeditions and use compact ore-dressing plants.


2021 ◽  
Vol 12 (3S) ◽  
pp. 683-702
Author(s):  
A. V. Gaiduk ◽  
D. N. Tverdokhlebov ◽  
E. A. Danko ◽  
E. I. Dolgova ◽  
A. B. Kleshnin ◽  
...  
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