scholarly journals Estimation of the Deep Geothermal Reservoir Temperature of the Thermal Waters of the Active Continental Margin (Okhotsk Sea Coast, Far East of Asia)

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1140
Author(s):  
Ivan V. Bragin ◽  
Elena V. Zippa ◽  
George A. Chelnokov ◽  
Natalia A. Kharitonova
Keyword(s):  
Continental Margin ◽  
Russian Far East ◽  
Active Continental Margin ◽  
Far East ◽  
Thermal Waters ◽  
Okhotsk Sea ◽  
Reservoir Temperature ◽  
Associated Gas ◽  
Δ18o And Δd ◽  
Sea Coast

Low-enthalpy thermal waters (30–70 °C) with nitrogen as a dominant associated gas are spread within the active continental margin of the Russian Far East (east and north of the Okhotsk Sea Coast) and traditionally are of great importance for recreation and balneology facilities. The thermal waters are chemically classified into three groups: (i) Na–HCO3(SO4) type, with low TDS (0.2 g/L) and lowest temperature (<50 °C) and high pH (9.1–9.3), (ii) Na–SO4 type with TDS (~1 g/L), highest temperature (70 °C) and weak alkaline pH (8.7) and (iii) Ca–Na–Cl type with high TDS (15 g/L), moderate T (59 °C) and neutral pH (7.5). The δ18O and δD values suggest that the thermal waters originate from meteoric water, and they are not isotopically fractionated. Silica and cation geothermometers and thermodynamic equilibrium calculations using the GeoT and PHREEQC programs indicate a reservoir temperature for the Na–HCO3(SO4) type thermal waters of 103–121 °C and for Na–SO4 and Ca–Na–Cl types of 136 and 153 °C, respectively. The evaluation of the mixing degree of the thermal water with cold groundwater shows that the equilibration temperature ranges between 148 and 153 °С. Estimated circulation depths for thermal manifestations range from 2.7 to 4.3 km and may be as great as 6 km.

scholarly journals Hydrochemistry of thermal waters in crystalline rocks of the Sikhote-Alin ridge, Far East of Russia

2019 ◽  
Vol 98 ◽  
pp. 07006
Author(s):  
George Chelnokov ◽  
Ivan Bragin ◽  
Natalia Kharitonova
Keyword(s):  
Residence Time ◽  
Russian Far East ◽  
Far East ◽  
Geothermal Gradient ◽  
Crystalline Rocks ◽  
Thermal Waters ◽  
Chemical Characteristics ◽  
Sikhote Alin ◽  
Associated Gas ◽  
The Russian Far East

Low-enthalpy thermal waters (30-50°C) of HCO3-Na and HCO3-SO4-Na types with nitrogen as a dominant associated gas discharge on the southern continental margin of the Russian Far East and traditionally are of great importance for recreation and balneology facilities. All studied thermal waters have meteoric origin and relate to Palaeocene granite intrusions. Based on the chemical characteristics and isotopic composition, thermal waters are divided onto “immature” thermal waters with a short residence time (3H=1.3±0.2TU), and “mature” thermal waters (3H=0.3±0.2TU) originated as a result of a longer evolution history (more than 60 years). The chemical composition of waters is largely determined by water-rock interactions, residence time and the local geothermal gradient.

scholarly journals Brief History of the North-West Okhotsk Sea Coast Archaeological Research (In Celebration of the 90th Anniversary of the First Northern Okhotsk Sea Coast Archaeology Publication by V. I. Ogorodnikov)

2021 ◽  
Vol 20 (5) ◽  
pp. 20-31
Author(s):  
Sergey B. Slobodin ◽  
Alisa Yu. Zelenskaya
Keyword(s):  
Far East ◽  
Northeast Asia ◽  
Northeastern Russia ◽  
Archaeological Research ◽  
Okhotsk Sea ◽  
North West ◽  
North East ◽  
The North ◽  
History Of ◽  
Sea Coast

Purpose. To analyze the significance of V. Ogorodnikov’s 1929 article on finds from Olsky (Zaviyalova) Island in the historiography of archaeological research in northeastern Russia. Results. An analysis of his published materials, in the context of the history of archaeological research in Northeast Asia in the 18th – first quarter of the 20th century shows that this was, in fact, the first professional publication on archaeological research in this part of northeast Asia. Until that time, sporadic publications about random finds and their fragmentary descriptions did not give a holistic picture of human existence in these territories. It was also the first Russian archaeological publication post-revolution on the antiquities of the north of the Far East. However, Ogorodnikov’s article, from the day of its publication, was forgotten, and in all further archaeological research, both in Northeast Asia as a whole, and on Zaviyalova Island and in Taui Bay in particular, was not mentioned and was not analyzed by the archaeologists who conducted research there, although the conclusions made by him were confirmed by further work. This, apparently, was due to the fact that although he was a well-known Siberian historian and the first Dean of the Department of History of Irkutsk University, Ogorodnikov was unjustly repressed for political reasons in 1933 and died in 1938 in a Gulag camp. Despite the fact that he was politically rehabilitated in 1957, his name has not yet returned to the historiography of archeology of Northeast Asia. This publication aims to fill this gap. The Neolithic age of the archaeological materials declared and published by Ogorodnikov, previously unforeseen and not justified by anyone for Northeast Asia, was fully confirmed by further research. Conclusion. The publication by Ogorodnikov in 1929 featuring results of the first excavations in Taui Bay on Olsky (Zaviyalova) Island is a significant milestone in archaeological research in the North-East of Russia.

scholarly journals Pathways of the Amur pink salmon Oncorhynchus gorbuscha to the areas of reproduction

2016 ◽  
Vol 186 (3) ◽  
pp. 121-134
Author(s):  
Vladimir I. Ostrovsky
Keyword(s):  
Russian Far East ◽  
Pink Salmon ◽  
Far East ◽  
Oncorhynchus Gorbuscha ◽  
Good Survival ◽  
Okhotsk Sea ◽  
Spawning Grounds ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Species Migration ◽  
By Catch

Biannual sequence of high-numerous and low-numerous year-classes of pink salmon ( Oncorhynchus gorbuscha ) is disturbed rarely in the areas close to its spawning grounds where mostly local groupings are landed, as it is shown on the data of fishery statistics in many areas of Russian Far East for 1907-1986. The disturbances are related usually with by-catch of transitory fish, in particular for the Sakhalin-Kuril region. Dynamics of the pink salmon annual landings in the Amur correlates with its dynamics at northwestern Sakhalin, that allows to suppose the species migration from the Okhotsk Sea to its spawning grounds via northwestern Sakhalin. Besides, a part of the Amur pink is caught at the mainland coast of the Gulf of Sakhalin, but the landings in the Amur correlate well with this transitory area in even years only, when the run is stronger. The highest catches of pink salmon on the mainland coast of the Gulf of Sakhalin in 2015 could be ensured neither the Amur nor the Sakhalin groupings; a hypothesis on the Shantar groupings contribution is discussed. In general, high catches of pink salmon in Khabarovsk Region in 2015-2016 are possibly reasoned by its good survival and lowered fishery in the Sakhalin-Kuril region.

A new species of Sextonia Chevreux, 1920 (Crustacea: Amphipoda: Liljeborgiidae) from the Okhotsk Sea

Zootaxa ◽  
2017 ◽  
Vol 4353 (3) ◽  
pp. 506
Author(s):  
VJACHESLAV S. LABAY
Keyword(s):  
New Species ◽  
Russian Far East ◽  
Far East ◽  
Sakhalin Island ◽  
Amphipod Species ◽  
Okhotsk Sea ◽  
A New Species

A new amphipod species, Sextonia caecus sp. nov., from the shelf of northern Sakhalin Island (Russian Far East) is described. A key to the amphipod species of the genus Sextonia is given. 

scholarly journals Izanagi-Pacific ridge subduction revealed by a 56 to 46 Ma magmatic gap along the northeast Asian margin

Geology ◽  
2019 ◽  
Vol 47 (10) ◽  
pp. 953-957 ◽  
Author(s):  
Jeremy Tsung-Jui Wu ◽  
Jonny Wu
Keyword(s):  
Continental Margin ◽  
Spatial Configuration ◽  
Russian Far East ◽  
Far East ◽  
Late Eocene ◽  
Spreading Ridge ◽  
Geological Evidence ◽  
Ridge Subduction ◽  
Northeast Asian ◽  
Early Cenozoic

Abstract Recent studies have debated the timing and spatial configuration of a possible intersection between the Pacific-Izanagi spreading ridge and the northeast Asian continental margin during Cretaceous or early Cenozoic times. Here we examine a newly compiled magmatic catalog of ∼900 published Cretaceous to Miocene igneous rock radioisotopic values and ages from the northeast Asian margin for ridge subduction evidence. Our synthesis reveals that a near-synchronous 56–46 Ma magmatic gap occurred across ∼1500 km of the Eurasian continental margin between Japan and Sikhote-Alin, Russian Far East. The magmatic gap separated two distinct phases of igneous activity: (1) an older, Cretaceous to Paleocene pre–56 Ma episode that had relatively lower εNd(t) (−15 to + 2), elevated (87Sr/86Sr)0 (initial ratio, 0.704–0.714), and relatively higher magmatic fluxes (∼1090 km2/m.y.); and (2) a younger, late Eocene to Miocene post–46 Ma phase that had relatively elevated εNd(t) (−2 to + 10), lower (87Sr/86Sr)0 (0.702–0.707), and a lower 390 km2/m.y. magmatic flux. The 56–46 Ma magmatic gap links other geological evidence across northeast Asia to constrain an early Cenozoic, low-angle ridge-trench intersection that had profound consequences for the Eurasian continental margin, and possibly led to the ca. 53–47 Ma Pacific plate reorganization.

scholarly journals ENTROPY PRODUCTION AND STABILITY OF DYNAMICS IN MODELS OF OPEN EXPLOITED TROPHIC CHAINS WITH EXPLICIT RESOURCE AND OMNIVORY EFFECT

2021 ◽  
Vol 1 (6) ◽  
pp. 47-51
Author(s):  
N.N. Zavalishin ◽  
Keyword(s):  
Organic Matter ◽  
Thermodynamic Property ◽  
Entropy Production ◽  
Vertical Structure ◽  
Russian Far East ◽  
Far East ◽  
Stationary States ◽  
Okhotsk Sea ◽  
Trophic Chains ◽  
Organic Matter Loss

Connection between stability of stationary states and such a thermodynamic property as an entropy production is studied for open trophic chains with explicit resource and omnivory effect. Entropy production is minimal in stable steady states under condition of non-negativity for their components. Marine trophic chains with “microbial loop” serve as examples of that kind of ecosystems with vertical structure. One of them is the pelagial of the Okhotsk Sea in Russian Far East. Additional organic matter passing through the loop facilitates the entropy production decrease, more organized trophic functioning and less organic matter loss comparing to the chain without omnivory

Geochemistry of Thermal Waters of Continental Margin of Far East of Russia

2016 ◽  
Vol 90 (1) ◽  
pp. 276-284 ◽  
Author(s):  
Ivan V. BRAGIN ◽  
Georgy A. CHELNOKOV ◽  
Oleg V. CHUDAEV ◽  
Natalia A. KHARITONOVA ◽  
Sergey V. VYSOTSKIY
Keyword(s):  
Continental Margin ◽  
Far East ◽  
Thermal Waters ◽  
Far East Of Russia

scholarly journals Geochemistry of Thermal Waters of the Okhotsk Sea Shore, Far East of Russia

2020 ◽  
Author(s):  
Ivan Bragin ◽  
George Chelnokov ◽  
Natalia Kharitonova
Keyword(s):  
Far East ◽  
Thermal Waters ◽  
Far East Of Russia ◽  
Okhotsk Sea
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