The deep structure of active continental margins of the Far East (Russia)

Rodnikov, A. G.; Sergeyeva, Natalia; Zabarinskaya, L. P.; Filatova, N. I.; Пийп, В. Б.; Рашидов, В. А.

doi:10.2205/2007es000224

Cited by 22 publications

(18 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The depth, where there is a partial melting in the upper mantle, is taken as an asthenosphere surface. The asthenosphere surface in the Sea of Okhotsk is limited by the isotherm of 1000 to 1200°C (Rodnikov et al, 2008). Similar calculations of deep temperatures were carried out for other marginal seas of the western part of the Pacific Ocean (Smirnov et al, 1991).…”

Section: Figure 3 Geotraverse Of the Okhotsk Sea Region At The Righmentioning

confidence: 76%

Crustal and mantle structure of the Sea of Okhotsk, Pacific Northwest: A review

2014

View full text Add to dashboard Cite

The highest seismic activity is observed along the Kuril Island Arc. Here the Pacific Plate is moving towards and being subducted under the continent, forming a seismic zone traced to a depth of 700 km. The seismicity is a result of the active subduction zone tectonics in the region. In the west, the Okhotsk Sea Plate is bounded by deep faults extending along Sakhalin. The deep faults correspond mostly to the system of right-lateral strike-slip faults and thrusts. There the earthquakes for the major part are localized in the crust (Zlobin, 2005). Shallow-focus earthquakes are connected with rift structures of a Kuril Basin and Tatar Strait Trough (Rodnikov et al., 2005). Okhotsk Sea Geotraverse The Okhotsk Sea Geotraverse crosses Sikhote Alin, Sakhalin, the Kuril Basin, Kuril Island Arc and Pacific (Fig. 3). The crust is constructed according to data from Galperin and Kosminskaya (1964), Zverev and Tulina (1971), Rodkin and Rodnikov (1996), and Piip and Rodnikov (2004), the upper mantle is constructed from Structure and Dynamics of the Lithosphere and Asthenosphere of the Okhotsk The deep structure of the Sea of Okhotsk under seismically dangerous regions is studied. The main feature of the deep structure in the region is the occurrence of an asthenospheric layer in the upper mantle. Asthenospheric diapirs can effectively rise through the crust, causing destruction of the lithosphere, formation of deep basins, faults and rifts accompanied by shallow-focus earthquakes, and eruptions of volcanoes. The vast majority of earthquakes are confined to the Kuril Island Arc, where the Pacific Plate is subducted under the continent. The seismicity in the region is a result of active tectonics in the subduction zone. This zone is traced to a depth of 700 km. In the west, the Okhotsk Sea Region is bounded by the deep faults extending along Sakhalin, where earthquakes are localized in the crust. The ancient subduction zone under Sakhalin is established. In the late Cretaceous to Paleogene the subduction of the Okhotsk Sea Plate under Sakhalin ceased. The reactivation of this ancient subduction zone may currently be in response to the strong earthquakes in Sakhalin.

show abstract

Section: Figure 3 Geotraverse Of the Okhotsk Sea Region At The Righmentioning

confidence: 76%

Crustal and mantle structure of the Sea of Okhotsk, Pacific Northwest: A review

2014

View full text Add to dashboard Cite

show abstract

“…Water supply is stable and is carried out mainly by groundwater from deep horizons. Heat flow variations in the Okhotsk-Chukotka volcanic belt consist of 65-84 mW/m 2 [16].…”

Section: Site Descriptionmentioning

confidence: 99%

“…The Sikhote-Alin folded area is mostly represented by mountains (up to 600 m) and hills distributed along the Sea of Japan coast. Heat flow variations in the Sikhote-Alin volcanic belt consist of 39-56 mW/m 2 [16].…”

Section: Site Descriptionmentioning

confidence: 99%

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

Bragin

Zippa

Челноков

et al. 2021

Water

View full text Add to dashboard Cite

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.

show abstract

“…Figure 10. Geotraverse of the Okhotsk Sea region (Galperin & Kosminskaya, 1964;Baranov, Dozorova, Karp & Karnaukh, 1999;Emelianova, Lelikov, Siedin & Naryzhnyi, 2003;Zlobin, 2005;Smirnov & Sugrobov, 1980;Rodnikov, Tuezov & Kharakhinov, 1996;Bogdanov & Khain, 2000;Rodnikov et al, 2001;Rodnikov, Sergeyeva, Zabarinskaya, Filatova, Piip, & Rashidov, 2008;Piip & Rodnikov, 2004). The route of the geotraverse is shown at the upper right.…”

Section: "Intermargins" Projectmentioning

confidence: 99%

“…Diapirs of partially melted matter rise from the asthenosphere and reach a depth of 20-30 km beneath the Tatar Strait Trough, Deryugin Basin, and Kuril Basin, creating an active tectonic regime that manifests in volcanic, seismic, and hydrothermal activity. The regions of the asthenosphere shown in red are areas of magma formation beneath the sedimentary basins (Rodnikov et al, 2008) Beneath the North Sakhalin sedimentary basin, which contains most of the oil and gas fields of Sakhalin, the asthenosphere is located at a depth of approximately 70 km. Hydrocarbon deposits were also found above the asthenospheric diapirs in the sedimentary basin of the Tatar Strait and Deryugin Basin, and sulfide mineralization was found in the Kuril Basin in submarine volcanic peaks.…”

Section: "Intermargins" Projectmentioning

confidence: 99%