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11.
Geotectonics - The Red River delta with an area of about 12 620 km2 is one of the largest deltas of Viet Nam and it also is one of the remarkable deltas of Asia. The delta was formed during... 相似文献
12.
The Amur River’s influence on the distribution of the opportunistic bacteria Listeria monocytogenes in the western part of the Sea of Okhotsk is discussed. The presence of Listeria in the seawater, sea ice, and sediments
on the northeastern Sakhalin shelf and slope supports the idea of its connection with the Amur River discharge. The hypothesis
of the allochtonic parentage of L. monocytogenes in the sea’s development is proved. 相似文献
13.
Polonik N. S. Ponomareva A. L. Eskova A. I. Shakirov R. B. Obzhirov A. I. Morozov E. G. 《Oceanology》2021,61(6):892-898
Oceanology - Methane concentrations were measured in the water layers on two transects crossing the central part of Bransfield Strait and along the Antarctic Sound. In the abyssal sea of the... 相似文献
14.
Shakirov R. B. Valitov M. G. Obzhirov A. I. Mishukov V. F. Yatsuk A. V. Syrbu N. S. Mishukova O. V. 《Marine Geophysical Researches》2019,40(4):581-600
Marine Geophysical Research - The paper presents the effects of gasgeochemical survey in the upper layer and water column, as well as in bottom sediments in the Tatar Strait (the North of the Sea... 相似文献
15.
N. H. Tuyen Ph. V. Phach R. B. Shakirov C. D. Trong Ph. N. Hung L. D. Anh 《Geotectonics》2018,52(3):359-381
The goal of the paper is to reveal the hierarchical block structure in the Tuan Giao area (Northwest Vietnam) and, on that base, to identify areas prone to earthquakes with M ≥ 5. Four large geoblocks of the second rank have been delineated on the basis of the joint analysis of geological, geophysical, geomorphic, and remote sensing data. The second rank geoblocks have been divided into smaller sub-blocks of the third rank. The recent geodynamics of the geoblocks have been characterized using geomorphic, seismological, gravity, and GPS data.The system of the delineated geoblocks is viewed as the Geodynamic Blocks model. The areas prone to earthquakes with M ≥ 5 have been identified using the pattern recognition algorithm CORA-3. The objects of the recognition were defined as circular areas, where boundaries of the geoblocks intersect each other. The recognition results confirm high seismic potential of the study region and provide information on potential earthquake sources for seismic hazard assessment: a number of boundary intersections have been identified as areas prone to earthquakes with M ≥ 5, where events of such magnitude have not been recorded up to date. Mordern geothermal activity and anomalies of dissolved methane (up to 10000 nL/L), helium and hydrogen in the hot mineral water springs prove high permeability of the study area and its active seismo-tectonic state. 相似文献
16.
Syrbu N. S. Shakirov R. B. Anh Le Duc Kholmogorov A. O. Iakimov T. S. Kalgin V. Yu. 《Lithology and Mineral Resources》2020,55(6):512-527
Lithology and Mineral Resources - Gas-geochemical studies of the methane, helium, and hydrogen concentrations in the water of thermal and mineral springs, as well as the subsurface atmosphere, of... 相似文献
17.
Two major groups of the lithosphere sources of methane are distinguished, i.e., the lithosphere sources proper (metamorphism, and serpentinization and spreading zones) and organic fuel deposits in the Earth’s crust. Hydrocarbon deposits, mud volcanoes, geothermal systems, and mineral sources are located on Sakhalin Island. All investigated objects are associated with large tectonic faults: the Yuzhno-Sakhalinsky and Main Pugachiovsky mud volcanoes are controlled by the Central Sakhalin fault; the Shakhterskoe coal deposit is confined to the West Sakhalin fault, while the Daginskaya geothermal system and the studied oil- and-gas fields are associated with the Hokkaido-Sakhalin fault. The authors’ studies of natural gases allow allocating two basic zones on the Sakhalin island with different types of hydrocarbon-carbon dioxide sources: Oil-and-gas (mostly methane; north-east) area and Coal-Gas area (carbon-dioxide-methane; west, south-west). Those areas differ in both chemical and isotope composition of natural gases. Some gashazardous areas have also been identified along tectonic faults, where they are due to gas release on the land surface. The populated localities on Sakhalin are shown to be situated near fault zones; therefore, the problem of gas hazard control is of critical importance. 相似文献
18.
This paper discusses the results of long-term monitoring observations on the chemical and isotopic composition of free gases
in gryphons of the South Sakhalin mud volcano on Sakhalin Island. It was shown that during seismic activation in the region,
the chemical composition of free gases changes, whereas the isotopic composition of carbon in methane and carbon dioxide remains
constant. A possible interpretation of the obtained data was suggested. The depth of the gas reservoir that supplies the South
Sakhalin mud volcano was estimated as well. 相似文献
19.
A.?ObzhirovEmail author R.?Shakirov A.?Salyuk E.?Suess N.?Biebow A.?Salomatin 《Geo-Marine Letters》2004,24(3):135-139
Methane investigations carried out in the Okhotsk Sea show that the methane flux from the earths interior into the water column increased during periods of seismo-tectonic activity between 1988 and 2002. In this case, methane gas hydrates found on the northeast Sakhalin slope may have decomposed due to a reactivation of fault zones. Methane emissions in the Okhotsk Sea generally can be divided into two forms. Firstly, methane vents from decomposing gas hydrates and/or free gas exist below gas hydrate saturated sediments via fault zones, venting into the water column with high bubble concentrations that were recorded by echosounding. These hydro-acoustic anomalies were named flares. Methane concentration inside these flares reached 10,000–20,000 nl/l (background methane concentrations in the Okhotsk Sea are less than 90–100 nl/l). Secondly, methane migrates as seepage into the water column from oil- and gas-bearing sedimentary source rocks on the eastern Sakhalin shelf, without showing acoustic anomalies in the water column, probably by filtration and diffusion processes. In these areas methane concentration reached 500–3,000 nl/l. In seismo-tectonically active regions, like the northwestern part of the Okhotsk Sea, many new flares were observed. Their distribution and orientation are usually controlled by fault zones (East Sakhalin Shear Zone in the Okhotsk Sea). 相似文献
20.
Data of integrated gas-geochemical studies in the 45 cruise of the R/V Akademik M.A. Lavrent’ev in July 2008 were used to study the spatial distribution of methane in the surface seawater layer, the distribution and qualitative composition of hydrocarbon gases in bottom sediments of the northwestern continental shelf, northeastern slope of Sakhalin Island, and Deryugin depression in the Sea of Okhotsk. The specific features of the methane anomalies that form in this case are considered. Tectonic faults and the distribution of oil-and-gas-bearing structures are the main factors governing the formation of hydrocarbon gas fluxes in the study area. The surface water in the entire examined area was found to be oversaturated with methane. A developed model was used to calculated methane fluxes at the water–atmosphere interface and to identify areas with maximal fluxes (up to 324 mol/(km2 day). 相似文献