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1.
V. P. Utkin 《Doklady Earth Sciences》2017,472(2):167-172
Based on the concept of tectonic delamination of the lithosphere, we revealed that the Sea of Japan and the Sea of Okhotsk were formed as a result of the tectonic flow of crustal material. The intermittent southward movement of southwestern Japan (Late Cretaceous–Cenozoic) along the eastern Japanese leftlateral strike-slip fault zone resulted in the formation of paired structures: back-arc extensional (Central Japan rift) and frontal compressional (South Japan imbricate–thrust belt) structures. The Sea of Okhotsk was formed in a similar tectonic setting: South Okhotsk rift (back-arc extensional structure) and Kamuikotan–Susunai compressional belt (frontal imbricate-thrust structure). Synchronous extension, compression, and strike-slip movements suggest that the tectonic flow of crustal material played a critical role in the formation of the Sea of Japan and the Sea of Okhotsk. 相似文献
2.
A. R. Geptner T. A. Ivanovskaya E. V. Pokrovskaya N. P. Kuralenko 《Lithology and Mineral Resources》2008,43(3):228-249
It is shown that glauconite-bearing interbeds are widespread in the layer-by-layer studied sections on the Sea of Okhotsk coast (Mainach section) and Kheisliveem River valley (Kavran section), the volcanoterrigenous rocks of the Kovachin, Amanin, and Gakkhin formations of the Paleogene in western Kamchatka (Upper Eocene-Lower Oligocene boundary beds). Detailed mineralogical and structural-crystallochemical characteristics of glauconite from the Amanin Formation are presented. It is suggested that such glauconite should not be used for geochronological purposes.Some specific features of glauconite formation, particularly, the preservation of specific morphological forms at high accumulation rates of volcano-terrigenous rocks, are discussed. Possibility of the formation of glauconite with the active influence of bacterial metabolism is considered. 相似文献
3.
The integral results of a seismic forecasting experiment for the powerful M > 7 earthquakes in the Kamchatka region are presented. According to the empirical scheme of the short-term earthquake prediction, since 2002 all officially recorded forecasts, including five deep-focus earthquakes in the Sea of Okhotsk, have been predicted without missing events. The specific character of the features of the earthquake preparation and the annular cloud structures that began to be observed in satellite images near the coast of Japan at the boundary of the Okhotsk plate are analyzed. 相似文献
4.
S. P. Pletnev 《Russian Journal of Pacific Geology》2009,3(2):118-127
The biofacies analysis of benthic foraminifers in sediments of the Sea of Okhotsk paleobasin revealed the presence of typical abyssal species in their Oligocene-Miocene assemblages that are missing in the Pliocene and Pleistocene section. The development of the abyssal fauna in the Sea of Okhotsk was determined by its relatively large depths (>2000 m) and intense water exchange with the Pacific Ocean. The Sakhalin folding phase at the Neogene-Quaternary transition resulted in the uplifting of the Japan-Kurile cordillera and separation of deep basins of the Japan and Okhotsk seas from the ocean, which was responsible for the formation of unfavorable conditions for migration and existence of the Pacific abyssal fauna. The taxonomic similarity and general tendencies in the development of the Neogene benthic foraminifers common for the Japan and Okhotsk seas imply the lack of narrow and shallow thresholds between these basins similar to the present-day Nevel’skoi, La Pérouse, and Sangar straits. Such bottom topography stimulated the intense northward water flow, which determined the similarity between the benthic foraminiferal assemblages of the Japanese and Okhotsk paleobasins. 相似文献
5.
A. Yu. Gladenkov 《Stratigraphy and Geological Correlation》2017,25(5):547-556
The results of the study on diatoms revealed in Eocene deposits of the Cenozoic sequence of the Pervoocherednaya hole, which was drilled near the Southwestern Kamchatka coast, are presented. The taxonomic composition of the studied diatom assemblage including marine diatom plankton is characterized. These are the first findings of Middle Eocene planktonic diatoms having a stratigraphic value in sequences of the eastern Sea of Okhotsk region. 相似文献
6.
A geological density section of the Deryugin Basin (western part of the Sea of Okhotsk) was studied along the profile Sakhalin Island-Deryugin Basin-Central Okhotsk Rise. The investigations were conducted by the method of gravity modeling, which allowed us to trace the density variations of the Earth’s crust layers along the lateral. The horizontal density stratification of the Earth’s crust layers was found, which assumes a stratified-block model of its structure. The established density structure of the Earth’s crust showed that the Deryugin Basin is located in the junction zone between the Sakhalin-Hokkaido microplate and the Okhotsk Sea Plate separated by a structural suture. The western and eastern edges of the basin belong to the aforementioned plates, respectively. It was assumed that accumulations of various mineral associations are confined to the suture zone, while the “granite” layer (basement) of the Deryugin trough walls in the western edge of the Deryugin Basin presumably contains secondary reservoirs of hydrocarbons. 相似文献
7.
基于对俄罗斯远东鄂霍茨克海域内的北萨哈林盆地石油地质条件的分析和已发现油气田的解剖,总结了盆地油气分布特征,结合构造演化分析,对影响油气成藏及分布的主控因素进行了探讨。研究表明：北萨哈林盆地油气分布具有陆上储量规模小、海域陆架规模大的特点,在纵向上可以划分为两大成藏组合,但油气主要富集于达吉组和努托夫组。这两个主要含油气层已发现油气藏在平面分布上具有明显的分带性,靠陆内带以达吉组油气藏分布为主,远陆外带以努托夫组油气藏分布为主。油气富集受多旋回构造演化、富油气凹陷及构造活动差异性等控制,海域陆架裂后坳陷内的低幅度隆起构造区为高丰度大中型油气田聚集的主要有利区。 相似文献
8.
Doklady Earth Sciences - The GPS-based coseismic observations in the epicentral zone of the earthquake on the Sea of Okhotsk of May 24, 2013, are analyzed. The peculiarities of the changes in... 相似文献
9.
N. V. Shestakov M. Ohzono H. Takahashi M. D. Gerasimenko V. G. Bykov E. I. Gordeev V. N. Chebrov N. N. Titkov S. S. Serovetnikov N. F. Vasilenko A. S. Prytkov A. A. Sorokin M. A. Serov M. N. Kondratyev V. V. Pupatenko 《Doklady Earth Sciences》2014,457(2):976-981
The Okhotsk deep focus earthquake (M w = 8.3), the largest in the history of instrumental seismology, occurred on May 24, 2013, at 05:45 UTC in the Sea of Okhotsk near the western coast of the Kamchatka Peninsula. For the first time we have succeeded in catching the field of horizontal and vertical coseismic offsets generated by a strong deep seismic event, and investigating its characteristics using continuous GPS measurements. Based on these data and taking into account the seismological information, we have developed a dislocation model of the Okhotsk deep focus earthquake. 相似文献
10.
V. Ye. Glotov 《冰川冻土》2004,26(Z1):286-290
In selecting methods of liquidation of natural pollution resulted from oil products (OP) in the cold regions, such as in the north coast of the Sea of Okhotsk, it is necessary to take into consideration the peculiarities of the OP and the object polluted in cold and warm periods. Generally, in cold time snow cover with thickness of 1. 0m or more presents, so the OP is partly absorbed by the silt in the snow, then the viscosity of snow is strengthened due to the aggregate of the hard hydrocarbon components (HCC) with negative temperature in the OP. The HCC is the most active when the molecular of carbon atom is less than 10, and could not be harden at the temperature below -30 ℃. However, in summer time the spilled HCC is partly evaporated, but the tar and asphalt enrich the OP there. In the mountainous regions at the deep deposition of underground water, in summer the OP might be brought by the gas stream in the massifs of the fracture rocks upper on the slope. According to the peculiarities, the methods of fighting the nature, polluted by the OP in the regions of the Sub-Arctic; are explained, and they are representative in the north coast of the Sea of Okhotsk. 相似文献
11.
《International Geology Review》2012,54(5):788-802
The tectonics of Kamchatka are reviewed in some detail and in several cases reinterpreted in light of recent geological and geophysical studies. Maps present major structural features and magnetic data, obtained by aerial survey. Recent work has confirmed four young phases of tectogenesis, accompanied by intrusions: 1) Late Cretaceous to early Paleogene (Laramian or Kamchatka phase), 2) early Miocene (Kuril phase), 3) late Miocene (Aleutian phase), and 4) late Pliocene (Sakhalin phase). These account for the young folded region that covers most of the Kamchatka Peninsula and the Koryak uplands to the northeast. Three structural-stratigraphic zones are recognized. The west zone is a marginal trough filled with coal- and oil-bearing strata, moderately folded. The central zone is an inner volcanic arc made up of volcanic rocks cut by granitoid rocks. The east zone consists of thick flysch with basic and ultrabasic igneous rocks characteristic of external folded arcs. In general, major synclinoria and anticlinoria have northeast strikes, and magnetic values in general correlate with the strike and composition of these belts. The meridionally oriented Central Massif of ancient rocks controlled the development of structures in nearby Tertiary and Cretaceous rocks. Deep faults also trend northeast and determined the position of volcanic and metallogenic zones, the ophiolite belts, and the chain of intrusive massifs. Geophysical work shows that the northern part of the Sea of Okhotsk is of platform type; it has recently been postulated that the Okhotsk massif is part of the Siberian platform.—W.D. Lowry 相似文献
12.
In the Late Cretaceous starting from the early Coniacian, three parallel suprasubduction structural units have developed contemporaneously in the northwestern Paleopacific framework: (1) the Okhotsk-Chukchi arc at the Asian continental margin, (2) the West Kamchatka and Essoveem ensialic arcs at the northwestern margins of the Kamchatka and Central Koryak continental blocks, and (3) the Achaivayam-Valagin ensimatic arc that extended to the southwest as the Lesser Kuril ensialic arc at the southern margin of the Sea of Okhotsk continental block. In this setting, the geodynamics of the Paleopacific plates exerted an effect only on the evolution of the outer (relative to the continent) ensimatic island arc, whereas the vast inner region between this arc and the continent evolved independently. As is seen from the character of the gravity field and seismic refractor velocity, the Kamchatka and Sea of Okhotsk continental blocks differ in the structure of the consolidated crust. These blocks collided with each other and the Asian continent in the middle Campanian (77 Ma ago). The extensive pre-Paleogene land that existed on the place of the present-day Sea of Okhotsk probably supplied the terrigenous material deposited since the late Campanian on the oceanic crust of the backarc basin to the south of the rise of inner continental blocks as the Khozgon, Lesnaya, and Ukelayat flysch complexes. The accretion of the Olyutor (Achaivayam) and Valagin segments of the ensimatic arc had different consequences due to the difference in thickness of the Earth’s crust. The Valagin segment was formed on an older basement and had a much greater thickness of the crust than the Olyutor segment. As follows from computations and the results of physical modeling, the island arcs having crust more than 25 km in thickness collide with the continental margin and are thrust over the latter. In the case under consideration, the thrusting of the Valagin segment led to metamorphism of the underlying rocks. The crust of the Olyutor segment was much thinner. The contact of this segment with the continental margin resulted only in surficial accretion, which did not bring about metamorphism, and the underlying lithospheric plate continued to plunge into the subduction zone. 相似文献
13.
Doklady Earth Sciences - The attenuation coefficients of sea waves in ice in the coastal zone of the Sea of Okhotsk with periods from 4 to 30 s were estimated as a function of their wavelength... 相似文献
14.
柴达木盆地东部层间氧化带砂岩型铀矿形成条件分析 总被引：4，自引：1，他引：4
本文从盆地构造演化、各演化期相关沉积、岩石地球化学特征、区域水文地质条件及沉积盖层中后生改造作用等方面，分析了柴达木盆地东部层间氧化带砂岩型铀矿的形成条件，认为该区有利于形成层间氧化带砂岩型铀矿化，是一个值得进一步探索的地区。 相似文献
15.
16.
A. Alabushev 《International Journal of Earth Sciences》1995,84(2):237-244
The marine sedimentary formations of the Middle Albian to Maastrichtian in the Cretaceous Sakhalin Basin (CSB) were investigated. These successions of strata consist of interbedded sandy, clayey and calcareous rocks which are underlain by heterogeneous metamorphosed (up to greenschist facies) Paleozoic to Mesozoic (pre-Aptian) rocks. The studied sections display several different facies reflecting geological settings ranging from an inner shelf to a continental slope. Three depositional complexes bound by regional subaerial unconformities are recognized within the marine successions. Since the Albian, the CSB has been a rapidly subsiding marginal part of the Okhotsk Sea plate. The Naiba Valley succession, corresponding to a sublittoral zone, shows extremely high sedimentation rates up to 190 m/Ma. The stratigraphic distribution of lithofacies indicates that the CSB became shallower from the Middle Albian to the Maastrichtian. 相似文献
17.
Doklady Earth Sciences - Signs of seawater intrusion into aquifers on the Black Sea coast have been considered. A review of publications showed that this dangerous hydrogeological process develops... 相似文献
18.
E. P. Lelikov I. B. Tsoy N. K. Vagina T. A. Emel’yanova E. P. Terekhov V. D. Khudik 《Russian Journal of Pacific Geology》2011,5(5):387-399
This paper reports the composition and age of rocks dredged from the Kashevarov Trough (central Sea of Okhotsk) during cruise
41 of the R/V Akademik M.A. Lavrentyev in 2006. It was found that the Late Cretaceous and Eocene volcanics from the Kashevarov Trough and Okhotsk-Chukotka volcanic
belt, structures of which are traceable in the Sea of Okhotsk, have similar petrographic and geochemical features. The Cenozoic
sedimentary cover consists of three different-age complexes: (1) the late Oligocene (∼28.2–24.0 Ma); (2) the terminal late
Oligocene-early Miocene (24.0–20.3 Ma); (3) the terminal late Pliocene-early Pleistocene (2.0–1.0 Ma). The upper Oligocene-lower
Miocene sediments were deposited in relatively shallow-water settings, whereas the late Pliocene-early Pleistocene complex
was formed in deeper environments, which was probably determined by tectonic processes. The geological data indicate that
the Kashevarov Trough and the surrounding underwater rises represented in the Oligocene-early Miocene a single shelf zone
of the Sea of Okhotsk, which is underlain by a structurally integral Mesozoic basement and is now subsided to depths of 800–1000
m. 相似文献
19.
Based on the analysis of tectonic feature and geodynamic characteristics of regional faults systems in the southeast Asia, 9 source zones capable of generating tsunamis affecting Vietnamese coast were delineated in the South China Sea and adjacent sea areas. Statistical methods were applied to estimate the seismic hazard parameters for each source zone, which can be used for the detail tsunami hazard assessment in the future. Maximum earthquake magnitude is predicted for the Manila Trench (8.3?C8.7), the Sulu Sea (8.0?C8.4), and the Selebes Sea source zones (8.1?C8.5). Among the source zones, the Manila Trench, west of the Philippines is considered as a most potential tsunami source, affecting the Vietnamese coast. The estimated M max values were used to develop simple scenarios (with a point source assumption) to calculate the tsunami travel time from each source zone to the Vietnamese coast. The results show that for the Manila Trench source zone, tsunami can hit the Vietnamese coast in 2?h at the earliest. 相似文献
20.
This paper reports the results of petrographic and geochemical studies of the Miocene-Pleistocene volcanic rocks that accompanied
the formation of the deep-water basins of the Sea of Japan and Sea of Okhotsk. The geochemical types of these rocks, their
geodynamic settings, and their derivation from different magmatic sources were determined. The marginal-sea basaltoids of
the Sea of Japan are derivatives of fluid-enriched mantle (EMI), while the volcanics of the Kurile basin were generated from
mantle enriched in continental crust (EMII). In spite of the different conditions of their genesis, they share some common
geochemical features, in particular, their calc-alkaline signatures. These traces of the influence of sialic crust on magma
generation confirm the development of the basins of both these seas on continental basement. 相似文献