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Cenozoic siliceous microplankton from the Okhotsk Sea and Kuril-Kamchatka Trench deposits

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Results of Cenozoic silicceous microplankton (diatoms, silicoflagellates, and radiolarians) from the sedimentary cover of the Okhotsk Sea and Kuril-Kamchatka Trench island slope study are presented in the book. Detailed description of micropaleontological assemblages of theMiddle Eocene to Pleistocene time interval, their age substantiation and full taxonomic composition are given. Marker species are illustrated pictures (diatoms - 144, silicoflagellates - 18, radiolarians - 58). Depositional conditions were reconstructed on the base of assemblage ecological composition analysis. An interpretation of Cenozoic paleoceanographic and geological history of the regions is proosed.
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... The North Pacific diatom zonations [5,24,31] and the composite tropicalsubtropical silicoflagellate zonal scale [22] were used for stratigraphic purposes. The reconstruction of the sedimentation settings is based on the analysis of the proportions between different ecological diatom groups [21]. ...
... The assemblage is dominated by neritic species (80.5%), which indicates shelf sedimentation settings. A similar assemblage was also found in sediments of this area during earlier dredging: on the southern plateau in the water depth interval of 3850 to 1500 m and on the northern plateau in the depth interval of 1250 to 740 m [21]. It was also reported from the Kamenskaya Formation of Bering Island [5]. ...
... The proportions of different ecological groups in these assemblages are variable and reflect environments ranging from bathyal (Station 35) to neritic (Station 36). Diatom assemblages corresponding to the indicated zone are established in sediments of the Sea of Okhotsk and northwestern Pacific[21]. Some samples contain radiolarians and single pollen grains and spores, in addition to diatoms and silicoflagellates.Slightly lithified siltstones and sandstones are dredged from the western slope of the northern plateau (Station 17, water depths 1770 to 1500 m). ...
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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.
... The basin has formed during the Early Oligocene-Late Miocene (32-7 Million years ago) (Karp et al., 2007). The accumulation of Late Pleistocene sediments has occurred at depths close to modern ones (Tsoy, 2007). ...
... ml L −1 , in the abyssal plain of the Kuril Basin, i.e. oxygen deficiency here was up to 10% (Kamenev, in this issue). The bottom sediments of the Kuril Basin of Sea of Okhotsk represented by a clayey silt or silty clay (often diatomaceous) which are characterized by a very soft (almost liquid) brown or greenish-brown oxidized surface layer of 2-11 cm thickness (Tsoy, 2007). The Sea of Okhotsk is characterized by low oxygen concentration. ...
... The age was determined by J.Barron and A. Gladenkov's diatom biostratigraphic zonal scale of the North Pacific [5,14]. The sedimentation conditions were reconstructed based on the relationships between the different ecological groups of diatoms [12,13]. The taxonomic names were given to diatoms and silicoflagellates with respect to the latest nomenclature transformations presented in the AlgaeBase global base of algae species (http:algaebase.org) ...
... Freshwater species (up to 10%) are represented primarily by extinct species. This ecological structure of the diatom assemblages is typical of the sediments in the outer shelf of the open sea [12,13] that were formed under the impact of coastal runoff. ...
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New diatom analysis data are obtained for the rocks of the Matituk and Pomyr Formations of Northern Sakhalin that assign these formations to the Late Miocene and Pliocene, respectively.
... The floor of the basin has gently sloping, flat or slightly undulating valleys in the west, which gradually give way to flat, horizontal valleys in the east. The seafloor is covered with thick finely-grained sediments, the bulk of which are diatom remains (Tsoy, 2007(Tsoy, , 2011. The Kuril Basin has formed during the Early Oligocene-Late Miocene (32-7 million years ago) (Karp et al., 2007). ...
... A rapid lowering of the basin basis (about 2 mm/year) began in the Early Pliocene (Baranov et al., 2002). The accumulation of Late Pleistocene sediments has occurred at depths close to modern ones (Tsoy, 2007). The main mass of water of the Sea of Okhotsk is of the Pacific origin. ...
Article
SokhoBio expedition Until recently hardly anything was known about the abyssal bivalve fauna of the Sea of Okhotsk, which communicates with the Pacific Ocean via many straits between the Kuril Islands with a maximum depth of 2318. m in Bussol Strait, and about its similarity with the deep-water fauna of the Pacific. Investigation of the materials collected by the SokhoBio Russian-German deep-sea expedition (RV "Akademik M.A. Lavrentyev", 2015), and two Russian expeditions (RV "Toporok", 1948; RV "Vityaz", 1949) from the bottom of the Kuril Basin of the Sea of Okhotsk (2850-3366. m depth) revealed a rich fauna of bivalves including 25 species belonging to 12 families, of which only 12 species (48.0%) were determined to the species level. Nine species (Poroleda extenuata, Katadesmia vincula, Dacrydium rostriferum, Bathyarca imitata, Catillopecten squamiformis, Channelaxinus excavata, Vesicomya pacifica, Cuspidaria cf. abyssopacifica, Myonera garretti) were first records for the Sea of Okhotsk. The richest families were Thyasiridae (7 species) and Cuspidariidae (6 species). The high diversity and richness of the bivalve fauna on the bottom of the Kuril Basin are probably caused by the favorable trophic conditions. The Kuril Basin is characterized by very high rates of sedimentation and high content of organic matter in the sediments. For estimation of connections between deep-water faunas of the Sea of Okhotsk and the Pacific Ocean, the SokhoBio expedition performed 1 station at the maximum depth of the Bussol Strait and 2 stations (3342-3432 and 4679-5013. m) on the Pacific slope of the Kuril Islands opposite to the Bussol Strait, where 24 species belonging to 13 families were found. Among the 25 species found in the deep part of the Kuril Basin more than half of species (17 species, 68%) occur in the Pacific Ocean. Most of them are widespread in the northern Pacific and are eurybathic bathyal-abyssal species. This probably allows them to penetrate into the Sea of Okhotsk through deep straits between the Kuril Islands. Photographs and taxonomic remarks are provided for all identified species (15) that were found in the Sea of Okhotsk and/or the Pacific Ocean. Taxonomic decisions herein: Nuculana aikawai Habe, 1958 and Nuculana sagamiensis Okutani, 1962 are synonymized with Nuculana leonina (Dall, 1896); Arca (Bathyarca) nucleator Dall, 1908 is synonymized with Bathyarca imitata (Smith, 1885); for Leda extenuata Dall, 1897, a new combination is suggested, Poroleda extenuata (Dall, 1897).
... The age was determined using the refined North Pacific Neogene diatom scale by Yanagisawa and Akiba [27] and the zones of the Sea of Japan using the silicoflagellates of Kobayashi [21] and Ling [24]. The conditions for the formation of the sediments were reconstructed based on the analysis of the ecological structure of the dia tom assemblages [15,16]. ...
... The area of the East Sakhalin Moun tains-Terpeniya Peninsula-submarine Terpeniya Ridge in the Early Paleogene presumably represented a single shallow water marine basin. The coastal shal low water sedimentation setting of the Late Pale ocene-Early Eocene deposits of the ridge is identified by the predominance of spongodiscid in the radiolar ian complexes [18]. ...
... The age was determined using the refined North Pacific Neogene diatom scale by Yanagisawa and Akiba [27] and the zones of the Sea of Japan using the silicoflagellates of Kobayashi [21] and Ling [24]. The conditions for the formation of the sediments were reconstructed based on the analysis of the ecological structure of the dia tom assemblages [15,16]. ...
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The petrographic and micropaleontological studies of the rocks in the sedimentary cover of the Primorye continental slope in the area of Vladimir Bay in the Sea of Japan made it possible to establish that the sedimentary cover is represented in this area by two different facial complexes of Late Miocene rocks. The first facial complex consists of terrigenous rocks (siltstones, sandstones, and conglomerates) that were accumulated under relatively shallowwater conditions of the shelf and the uppermost part of the continental slope. The second one is formed by diatomaceous–clayey rocks under more deep water conditions, mainly in the upper part of the continental slope. The carbonate nodules that are widely distributed among the deposits of the first complex but are also recorded in the second one were formed as a result of diagenetic processes in the terrigenous or silicious–terrigenous sediments that had been formed. With respect to their age, the Late Miocene deposits are characterized by a full succession of diatomaceous zones over 10.0–5.5 mln yr. The sediments of the first facial complex accumulated during the first third of the Late Miocene (10.0–8.5 mln yr), while those of the second began to accumulate somewhat later, but their accumulation continued until the late Miocene (9.2–5.5 mln yr).
... 30 Ma ago) [34]. Previously, we identified the Early Oligocene shallow water diatom assemblage in the sandstones and tuffaceous diatomites of the northern plateau [28]. ...
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This paper describes the volcanosedimentary complexes of different ages (Late Cretaceous-Early Paleocene, Paleocene-Eocene (?), Oligocene-Early Miocene, and Pliocene-Pleistocene) that compose the basement and sedimentary cover of the submarine Vityaz Ridge. It was found that the Upper Cretaceous sedimentary rocks from the basement of the Vityaz Ridge (felsic) and the Lesser Kuril Ridge (mafic) have different compositions. Matrix mineral assemblages corresponding to the smectite and corrensite stages of epigenesis of Cenozoic rocks were distinguished, and a scheme of the Late Cretaceous-Pleistocene geological evolution of the region was proposed.
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Radiolaria are marine siliceous microfossils used to reconstruct paleoceanographic and paleoclimatic events. This report presents a dataset obtained from radiolarian analysis for the biostratigraphic and paleoceanographic reconstructions of the submarine Vityaz Ridge and the Kuril-Kamchatka Trench paraxial zone. Data were obtained from dredge samples collected during the 4th cruise of the R/V Akademik A. Nesmeyanov in 1984 and during the 37th, 41st, and 52nd cruises of the R/V Akademik M. A. Lavrentyev in 2005, 2006, and 2010, respectively. Both new and previously published data on distribution of the Pleistocene radiolarian zones in the North Pacific are presented in this report.
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The abrupt, widespread, and simultaneous extinction of radiolarian species makes them ideal stratigraphic markers. Five species became extinct in the North Pacific during the last 3 m.y. Four of these are used to define four stratigraphic zones. The boundary between the oldest two zones correlates with the Pliocene/Pleistocene boundary, as defined in southern Italy. These zones can be related through paleomagnetic stratigraphy to previously established radiolarian and foraminiferal zonations. One species (Eucyrtidium matuyamai) evolved and became extinct during the last 2.5 m.y. Its evolution can be related to the invasion of and adaptation to a new habitat. The extinction of E. matuyamai shows a striking correlation with the magnetic reversal at the base of the Jaramillo event. The rapid evolution of this species probably reduced the genetic variability of the population, making it more vulnerable to extinction than other less rapidly evolving species. The environmental change that caused the extinction is unclear; however, there is suggestive evidence that it is in some way related to a reversal of the earth’s field. If reversals cause abrupt environmental changes, they may have played an important selective role through geologic time.
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North Pacific diatom zones XXIII through IX of Schrader are recognizable in the middle Miocene to lower Pliocene stratigraphic section exposed around Upper Newport Bay in Newport Beach, California. Correlation with DSDP Site 173 and other stratigraphic sections in California allows the selection of diatom datums that are the most reliable for long-distance correlation. Individual diatom datums are proposed as markers for North Pacific diatom zones XXIII through IX.Correlations with DSDP Site 173 reveal a hiatus in the lower part of Core 15 that corresponds with a distinct lithologic and floral change in the core.Preliminary silicoflagellate data for the Upper Newport Bay stratigraphic section supports the diatom correlations, Correlation with calcareous nannofossil, radiolarian, and silicoflagellate zones at Upper Newport Bay and at DSDP Site 173 suggests that the boundary between North Pacific diatom zones XVII and XVI approximates the middle Miocene/upper Miocene boundary. The Miocene/Pliocene boundary is estimated to be in North Pacific diatom zone X.One new stratigraphically useful diatom species is described, Lithodesmium reynoldsii.
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