排序方式： 共有17条查询结果，搜索用时 15 毫秒
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Oceanology - A comparative analysis of the content and composition of organic matter (OM) in samples of bottom sediments and subaqueous permafrost rocks by the concentration of organic carbon (OC),... 相似文献
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A. S. Ulyantsev E. A. Romankevich S. Yu. Bratskaya N. A. Prokuda S. V. Sukhoverkhov I. P. Semiletov V. I. Sergienko 《Doklady Earth Sciences》2017,473(2):449-453
The molecular composition and distribution of the concentration of n-alkanes are considered for sediments of boreholes drilled in the shallow part of the Laptev Sea, in the area of Buor Khaya Gulf. The diverse molecular composition of n-alkanes is dominated by long-chain odd homologs, which indicate terrigenous organic matter (OM). Heterogeneous distribution and burial of OM are shown under conditions of pulsating contribution of river and thermoabrasive material and multiple changes in them up to hiatuses in sedimentation. 相似文献
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A. S. Ulyantsev N. V. Polyakova E. A. Romankevich I. P. Semiletov V. I. Sergienko 《Doklady Earth Sciences》2016,467(1):308-313
The cationic and anionic compositions of pore water in shallow deposits of Buor-Khaya Bay is studied. Significant concentration heterogeneity of the vertical ionic profile in the studied drill columns is shown. It is established that the vertical ionic profile of shelf deposits of the Laptev Sea is basically formed under the influence of thawing of underwater permafrost, hydrodynamic conditions, the water mass, and heat flows and depends on the lithological and granulometric types of the deposits. The highest concentrations of ions are registered in plant detritus represented by ground grass vegetation. A relationship between the ionic composition of pore water and cryogenic state of the sequence and its variability is demonstrated using the method of major components. 相似文献
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Oceanology - The paper presents the results of grain size analysis of bottom sediments and subsea permafrost from three cores drilled in Buor-Khaya Bay. A pronounced lithologic differentiation of... 相似文献
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Ulyantsev A. S. Polyakova N. V. Bratskaya S. Yu. Romankevich E. A. 《Doklady Earth Sciences》2018,483(1):1480-1484
Doklady Earth Sciences - The differences in the concentration of elements between thawed and frozen sediments were shown in the samples from two boreholes from the coastal zone of the Laptev Sea... 相似文献
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Osadchiev A. A. Barymova A. A. Sedakov R. O. Rybin A. V. Tanurkov A. G. Krylov A. A. Kremenetskiy V. V. Mosharov S. A. Polukhin A. A. Ulyantsev A. S. Osadchiev M. A. Dbar R. S. 《Oceanology》2021,61(1):1-14
Oceanology - This work is focused on the river plume generated by the Kodor River which is the largest river of Abkhazia and the northeastern coast of the Black Sea. Based on in situ hydrological... 相似文献
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Ulyantsev A. S. Romankevich E. A. Bratskaya S. Yu. Semiletov I. P. Avramenko V. A. 《Doklady Earth Sciences》2017,473(2):467-471
Doklady Earth Sciences - The distribution of organic and carbonate carbon in core samples from holes drilled in the shallow part of the Laptev Sea, in the region of Buor-Khaya Bay and Bykovskii... 相似文献
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A. S. Ulyantsev S. Yu. Bratskaya E. A. Romankevich I. P. Semiletov V. A. Avramenko 《Doklady Earth Sciences》2016,467(1):241-245
New data on the particle size composition of the Laptev Sea shelf deposits were obtained on the basis of results of low-angle laser light-scattering of core samples from the columns studied. It was revealed that the sand fraction dominates. The results of comparative analysis of the particle size composition of deposits show that the Laptev Sea shelf zone was characterized by highly variable spatial–temporal conditions and settings of sedimentation in the Quaternary, a polygenic character of deposits, and a pulsating influence of fluvial and slope processes on the conditions of sedimentation. A tendency of coarsening in the vertical sequence that contributes to thawing of the permafrost was revealed in the Ivashkina lagoon. 相似文献
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E. A. Romankevich A. A. Vetrov N. A. Belyaev V. I. Sergienko I. P. Semiletov S. V. Sukhoverkhov S. Yu. Bratskaya N. A. Prokuda A. S. Ulyantsev 《Doklady Earth Sciences》2017,472(1):36-39
The distribution and genesis of n-alkanes in sediments from the 38-m sequence obtained during core boring in the Ivashkina lagoon were studied. Sediments were formed in the Holocene as a result of thermokarst and penetration of seawater. The sequence mostly includes permafrost rocks partially molten in the upper horizons and covered by Quaternary deposits, which are mostly the products of thermoabrasion. 相似文献
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