Геоморфология и палеогеография

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№ 3 (2009)

Научные сообщения 

25-31 677
The structure is analyzed of loess rock mass that builds up the top of the section near Georgievskoye village on Kerch Peninsular. The author supposes the alluvium-lagoon genesis of this rock mass. Typical marine Karangad deposits in the bottom of the section correspond to one of the first transgressive phase of the Black Sea. The consequent maximum transgression (Karangad) up to 15-20 m marks many shores of the Black Sea as lagoon-transgressive terraces and correlated river embouchment terraces.
32-38 363
The granulometric characteristics of the mountain river Baksan channel deposits and their dynamics are analyzed at the points of the falls of the mudflow tributaries. The dependence on longitudinal profile, channel morphology, frequency and volume of mudflows is taking into account. Changes of granulometric composition are examined immediately after the mudflow events and between them.
38-49 382

The existence of the deep faults system and the macro-block structure of the transition zone between Eurasia and the Pacific Ocean provide the disjunctive nature of the basins boundaries of the marginal seas. These basins are the block morphostructures with the specific development history. The preservation of the steady, long living network of faults in the Okhotsk and Japan Sea region, where recent horizontal motions of geoblocks are traced according to GPS monitoring data, may be explained only considering Eurasian-Pacific transition zone as single buffer geodynamic system. Relative motions of mega-plates transform the pattern of faults and blocks of the transition zone as integral formation.

49-56 416
The MSR scheme of Upper Volga basin is compiled. The lay of the Volga valley is connected with the Earth's crust block structure of the region: the intersections of lineaments of the first and second orders - morphostructural junctions - are the places of the primary changes of valley direction. These junctions are characterized by high activity of deep and surface processes. Steadiness of valley direction and its geomorphologic structure are conditioned by lineament zone the valley is going along.
56-65 423
By use of geomorphologic methods, the evidences of neotectonic activation of some local structures (thrusts, normal faults, and folds) on the archipelago Spitsbergen were found. The existing of morphostructures of compression is especially interesting, while in accordance with the prevalent view extension is the main characteristic of neotectonic regime of the area.
66-76 495
The evaluation of the geomorphologic hazard of active faults was made in the region of Sayan-Shusha waterpower (west Sayan) and in the South and Middle Cisbaikaline. Active faults are strong factor of geomorphologic hazard. It may really cause the geomorphologic risk for human activity, extremely hazardous situations, and natural disasters. The density of faults may serve as the criterion for assessment of geomorphologic hazard.
77-93 471
Melted pyrogenic rocks - paralavas - are analogous to magmas regarding their certain mineralogical and geochemical characteristics. Present methods of volcanic rocks radiometric dating may be used for the absolute dating of coal fires. Petrologic study of pyrometamorphic complexes was fulfilled in the Prokop'evsky-Kiselevsky region of Kuzbass; some rock groups were shown to be applicable for such dating. First radiometric datings were obtained: older group - 1.22 ± 0.44 Ma (40Ar/39Ar) and 1.8 ± 0.2 (K/40Ar) - is represented by rocks from the block between the Tyrgansky thrust and Afonin-Kiselevsky overlap fault. Another, younger group - 0.19 ± 0.26 Ma (40Ar/39Ar) and 0.48 ± 0.11 Ma (K/40Ar) - consists of paralavas from the more eastern block between Afonin-Kiselevsky and Kiselevsky overlap faults. These datings correspond to main stages of neotectonic activization of the boundary between the Salair and Kuznetsk basin because the coal fires were contemporised to the uplifts of the territory and to the putting the coal into the zone of aeration.
94-100 462
Peculiarities of the formation of terrigenous and organic bottom sediments in the Barents Sea coastal zone are considered. The influence of bottom organisms on the sedimentation and physico-chemical parameters of bottom deposits is established. Lithological features of these deposits determine the distribution of benthic communities on the surface of littoral. As a result of accumulative activity of bottom filterers, like the fabritia polychaeta, the silting of the sandy littoral continues. Owing to the biosedimentation process the coastal zone is highly productive of biomass and density of bottom organisms, so it plays an important role in the nutritive matter balance of the coastal ecosystem.
100-111 467
The East Antarctica may be subdivided into 5 regions: basins and troughs (<-100 m), plains (-100-Ю0 m), hills (400-1000 m), low mountains (1000-1500 m), middle mountains (>1500 m). There are evidences of at least two stages of subglacial relief formation. The first stage corresponds to platform type development with weak tectonic activity. The second one is characteristic of mobile folded zones where tectonic movements had large amplitudes and strong spatial differentiation (especially during Cenozoic era).

Общетеоретические статьи 

3-7 358
Authors conceive the time organization of geomorphologie system as an ordered and concerted existence and functioning of the system's elements during certain time. It is also a directional development of system, sequence of stages and phases of evolution. The problem is considered on the example of two arid geomorphologic systems -badlands in the foothill of Terskey-Alatow ridge (Tien-Shan) and gammada in the South of Mongolia. It is shown that morphology, contemporary processes, lithochemical conditions, and the surface runoff types are closely correlated and tend to maintain systems in the state of dynamic equilibrium.
7-14 364
A special type of local plantain surfaces is described - lithogenic steps, subhorizontal or slightly tilted, worked along the bedding. Such steps may arise on the valley flanges, on the slopes or on the summits. They may form stepped slope complexes morphologically similar to piedmont steps.

Экологическая и прикладная геоморфология 

15-24 360
Technogenic transformation of river basins results in considerable changes of their form and other characteristics what leads to the discharge changes. Perennial observations in the upper stream of the Ochakovka River indicate the alternation of the erosion and accumulation in the basin, the human impact being the main factor of these processes. For such basins' steady functioning the restrictions of anthropogenic load are necessary, for instance the scientific based distribution of recreation activity and special attention for land use planning.

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ISSN 2949-1789 (Print)
ISSN 2949-1797 (Online)