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81.
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83.
A. S. Astakhov R. Tiedemann I. O. Murdmaa O. Yu. Bogdanova A. V. Mozherovsky N. A. Sereda 《Oceanology》2006,46(5):716-729
The mineral and chemical compositions of authigenic carbonates are studied by several methods in a sediment core obtained from the axial zone of the Deryugin riftogenic basin. Manganese carbonates (kutnahorite, rhodochrosite) associated with manganiferous calcite, manganiferous pyrite, and nontronite are first identified in the Sea of Okhotsk. Manganese carbonates in the Holocene diatomaceous ooze were presumably formed due to diagenetic transformation of sedimentary manganese hydroxides, organic matter, and biogenic silica, while those found in the underlying turbidites precipitated owing to the intermittent influx of endogenic fluids migrating along sand interbeds. 相似文献
84.
Geoffrey P. Glasby Irina A. Prozherova Valery V. Maslennikov Sergey I. Petukhov 《Resource Geology》2007,57(1):24-36
The Jusa and Barsuchi Log volcanogenic massive sulfide (VMS) deposits formed along a paleo island arc in the east Magnitogrosk zone of the Southern Urals between ca 398 and 390 Ma. By analogy with the VMS deposits of the west Magnitogrosk zone, they are considered to be Baimak type deposits, which are Zn‐Cu‐Ba deposits containing Au, Ag and minor Pb. Detailed mapping and textural analysis of the two deposits shows that they formed as submarine hydrothermal mounds which were subsequently destroyed on the sea floor under the influence of ocean bottom currents and slumping. Both deposits display a ratio of the length to the maximum width of the deposit >15 and are characterized by ribbon‐like layers composed mainly of bedded ore and consisting principally of altered fine clastic ore facies. The Jusa deposit appears to have formed in two stages: deposition of colloform pyrite followed by deposition of copper–zinc–lead sulfides characterized by the close association of pyrite, chalcopyrite, sphalerite, galena, tennantite, arsenopyrite, marcasite, pyrrhotite, bornite, native gold and electrum and high concentrations of gold and silver. The low metamorphic grade of the east Magnitogorsk zone accounts for the exceptional degree of preservation of these deposits. 相似文献
85.
Volokhin Yu. G. Astakhov A. S. Vashchenkova N. G. 《Lithology and Mineral Resources》2004,39(3):259-280
The mineral and chemical compositions and physical properties of diatomaceous clayey–siliceous sediments in the Sea of Okhotsk are studied. Absolute masses of silica accumulation are determined. Their compositional model based on the silica content is similar to that of Late Jurassic and Olenekian–middle Anisian cherts of the Sikhote Alin region. The thickness of the Holocene siliceous unit and the absolute mass of siliceous deposits depended on bioproductivity in the upper water column and the seafloor topography. Absolute masses of SiO2
am (0.05–5.7 g cm–2 ka–1) and SiO2
fr (0.5–11.6 g cm–2 ka–1) are minimal on seamounts and maximal in depressions near foothills. These values match absolute masses of SiO2
fr accumulations in Triassic and Late Jurassic basins of the Sikhote Alin region (0.33–3 g cm–2 ka–1). Comparison of the composition and absolute masses of silica shows that Triassic and Late Jurassic siliceous sequences of Sikhote Alin could be accumulated in the marginal marine basin near a continent. 相似文献
86.
We consider two classical celestial-mechanical systems: the planar restricted circular three-body problem and its simplification, the Hill’s problem. Numerical and analytical analyses of the covering of a Hill’s region by solutions starting with zero velocity at its boundary are presented. We show that, in all considered cases, there always exists an area inside a Hill’s region that is uncovered by the solutions. 相似文献
87.
88.
Ocean Dynamics - Effects of the viscosity, Earth rotation, and sphericity (beta-effect) on the long-wave dynamics are investigated based on the linear model. The basic equation for the complex... 相似文献
89.
V. V. Kalinchuk A. S. Astakhov V. F. Mishukov K. I. Aksentov 《Russian Meteorology and Hydrology》2013,38(5):313-319
Presented are the results of measuring the concentration of atomic mercury Hg0 on August 28–30, 2012 in the atmospheric surface layer over the Ussuri Bay in the Sea of Japan during the typhoon Bolaven passage. It is revealed that the Hg0 concentration during this period varied from 1.7 to 3.3 ng/m3. The maximum values were observed at the coming of mercury-enriched air masses from the Yellow Sea area at the simultaneous decrease in the air pressure and increase in the wind speed. 相似文献
90.
E. G. Vologina M. Sturm I. A. Kalugin A. V. Darin A. S. Astakhov G. P. Chernyaeva A. N. Kolesnik A. A. Bosin 《Doklady Earth Sciences》2016,469(2):841-845
Integrated studies were performed on bottom sediments collected in the Chukchi Sea in the northern part of the Gerald Canyon 150 km northeast from Wrangel Island. The recent sedimentation rate amounted to 0.9 mm/year by 210Pb at the sampling site. The concentrations of biogenic components (SiO2bio, Сorg, Ntot, and Br) were minimum at the lower part of the core, where an increase of Thalassiosira antarctica antarctica, probably results from low biological productivity during the Maunder Minimum. The increased concentrations of biogenic components, as well as the decreased values of magnetic susceptibility and X-ray density, in the upper part of the core (1–2 cm) correspond to the last decade of recent of global warming. 相似文献