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E. P. Terekhov I. B. Tsoy A. V. Mozherovskii N. K. Vagina 《Stratigraphy and Geological Correlation》2011,19(3):337-351
Shikotan Island of the Lesser Kuril Ridge forms, together with the Vityaz Ridge, the outer arc of the Kuril island-arc system. Marine Pliocene sediments first registered on the island contain diatoms and palynomorphs, which allow their dating. The thin Pliocene semiconsolidated sediments constitute the upper part of sections in the coastal and central areas of the island. They rest with the erosional surface and stratigraphic hiatus upon the Upper Cretaceous-Lower Paleogene (Campanian-Danian) Malokuril’sk Formation. The Pliocene sediments were deposited in relatively shallow-water environments of open sea near the shore, with a forest-free landscape and freshwater basins. The occurrence of reworked marine Oligocene and Miocene diatoms in these sedimentary rocks indicates their development in the Lesser Kuril Ridge area and contribution of their eroded material to the formation of Pliocene sequences. Wide development of Pliocene Marine sediments on Shikotan Island is evidence for ascending movements in the region during the post-Pliocene period, which is also characteristic of the Greater Kuril Ridge islands. The composition and formation conditions of the Pliocene sediments in the outer arc of the Kuril island-arc system suggest that the southwestern (Lesser Kuril Ridge) and northeastern (Vityaz Ridge) segments of this single anticlinal structure evolved under different tectonic regimes through the Pliocene. 相似文献
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Paleontological assemblages from Cenozoic sediments of the continental slope in the Peter the Great Bay (Sea of Japan) are characterized. Paleontological remains are represented by diverse and abundant siliceous microfossils (diatoms, silicoflagellates, radiolarians) and palynological complexes. The use of high-resolution biostratigraphic zonations made it possible to specify the age of sediments and reconstruct environmental changes during the last 17 Ma. The history of paleontological studies in this area of the Sea of Japan, which is of key importance for development of methods for marine geological works, is reviewed. 相似文献
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B. N. Filyushkin M. A. Sokolovskiy N. G. Kozhelupova I. M. Vagina 《Doklady Earth Sciences》2011,439(1):986-989
In the northeastern portion of the Atlantic Ocean, at depths of 500–1500 m, there are regular intrathermocline eddies that
are characterized by high temperature and salinity. As these eddies interact with the ambient medium, they can transmit a
dynamic signal to the ocean surface. These eddies are clearly identifiable on altimetric maps showing variations in the ocean’s
surface level obtained by satellites. Such observations allow recording not only the complex interaction pattern of surface
cyclonic and anticyclonic eddies, but also the processes of merging and separation of intrathermocline eddies. 相似文献
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I. B. Tsoy M. T. Gorovaya L. N. Vasilenko N. G. Vashchenkova N. K. Vagina 《Stratigraphy and Geological Correlation》2017,25(1):99-121
The paper reports on the micropaleontologcal (diatoms, silicoflagellates, radiolarians, and pollen flora) data substantiating the age and conditions of sedimentary cover formation of the submarine Ulleung Plateau (Krishtofovich Rise) in the Sea of Japan. Five rock complexes with different age and origin were distinguished on the basis of micropaleontological and petrographic data. Complex 1 (tuffites, tuffogenous siltstones) with numerous freshwater diatoms and pollen flora that prove the lacustrine genesis and the Early Miocene age occurs at the base of the sedimentary cover. Complexes 2–5 are composed of marine tuffogenous sedimentary deposits of end of Early Miocene–Pleistocene age. Stratigraphic unconformity between continental and marine deposits involves a short-time interval in the end of the Early Miocene and points to rather fast tectonic submersion of the Ulleung Plateau. Marine sedimentation in bathyal conditions dominated from the end of the Early Miocene. In the Late Miocene, in the northern part of the plateau, the region of the large rise was characterized by shallow-water conditions, indicating supposed existence of an island territory in this place. 相似文献
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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
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Filyushkin B. N. Sokolovskiy M. A. Kozhelupova N. G. Vagina I. M. 《Doklady Earth Sciences》2011,441(2):1757-1760
Anticyclonic and cyclonic mediterranean eddies are formed on continental slopes of the Iberian Peninsula. Cyclonic eddies
commonly live for 0.5–1 year at most. Anticyclonic eddies (meddies) live for 4–5 years, on average, but there are eddies of
7–8 years in age drifting at the distance of up to 6000 km from the region of its formation. According to the results of observations,
in some regions of the Atlantic Ocean, the meddies are destructed partially or completely after contact with submarine mountains.
However, it is impossible to trace evolution of the lens moving over the submarine obstacle by the field data. We studied
the modeled influence of variable-height submarine hills on movement of cyclonic and anticyclonic intrathermocline eddies
by the contour dynamics method. The evolution of lenses appeared to be quite sensitive to variations in hill height. Cyclonic
and anticyclonic lenses interact with the hill in different ways. The data of unique field observations of Mediterranean lenses
in the North Atlantic are confirmed by the results of our model experiments. Hence, it is possible to predict basic, similar
to real, scenarios of interaction of intrathermocline eddies under conditions of complex bottom relief in the context of the
three-layered ocean model. 相似文献
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E. P. Lelikov I. B. Tsoy T. A. Emel’yanova E. P. Terekhov N. G. Vashchenkova N. K. Vagina O. L. Smirnova V. D. Khudik 《Russian Journal of Pacific Geology》2008,2(2):99-109
Results of geological research conducted by the Pacific Oceanological Institute of the Far East Division of the Russian Academy of Sciences and the Institute of Oceanology of the Russian Academy of Sciences on the submarine Vityaz Ridge during Cruise 37 of R/V Akademik M.A. Lavrentyev in 2005 are discussed. Various rocks constituting the basement and sedimentary cover of the ridge were dredged in three areas of the ridge. Based on isotope geochronology, petrogeochemical, petrographic, and paleontological data and comparison with similar rocks available from the adjacent land and Sea of Okhotsk, they are subdivided into several age complexes. Late Cretaceous, Eocene, Late Oligocene, Miocene, and Pliocene-Pleistocene complexes are defined among the igneous rocks, while volcanogenic-sedimentary rocks are united into Late Cretaceous-Early Paleocene (late Campanian-Danian), undivided Paleogene (Paleocene-Eocene?), Oligocene-early Miocene, and Pliocene-Pleistocene complexes. The obtained data on the age and formation settings of the defined complexes made it possible to reconstruct the geological evolution of the central Pacific slope of the Kurile island arc. 相似文献
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