Геоморфология и палеогеография

Расширенный поиск
№ 2 (2005)

Общетеоретические статьи 

3-11 528
The paper deals with theoretical fundamentals of morphosystem analysis application for land-sea contact zone investi-gation. Coastal morphosystem with three subsystems - primor'e, coastal zone, and vzmor'e - were taken as the objects. Authors suggest meaning the term "coastal morphosystem" as the unity of coastal zone and adjacent parts of pri-nor'e and vzmor'e, which exchange energy and matter in the course of recent relief formation.


12-16 595
Authors suggest reexamining the boundaries of the Caucasus taking into account the ideas of plate tectonics.

Методика научных исследований 

17-25 378
The detailed bathymetric maps of the Middle Atlantic Ridge axis zone obtained by submarine stacked-beam sur-vey have let to fulfill the lineament analysis of the structural-tectonic position of abyssal sulfide-bearing ores. Recent hydrothermal activity and related sulfide-bearing ores were showed to gravitate to the most young fault system of di-agonal strike. These results may be helpful in sulfide ore prospecting.

Научные сообщения 

26-34 431
Relationship of deposition rate on small basin bottoms with the bottom structure was studied. Morphometric anal-ysis and radioisotope method (|,7Cs) were used. Researches were carried out at Central Russian Upland. Empirical interrelations between the structure of small basins and the deposition rates were revealed. Basins with curved longi-tudinal profiles have an accumulative layer increasing with basin order. Basins with straightened profile are charac-terized by decreasing thickness of accumulation layer as order of basin is growing. Linear correlation between accu-mulation volumes and areas has been established: V =8175 + 48, where V - mid-annual volume of deposition on a basin bottom of any order, m3; S - basin area of this order, km1. The correlation between sediment accumulation rate and morphometric parameters of small basins may be used for estimation of total accumulation on the bottom for the "cesium" period.
35-40 473
The classification of low order mountain valleys was made for three regions of East Siberia: Aldansky. Kularsky. and Lensky. It is based on channel types and showed the catholicity and reliability of mountain river classification developed by R.S. Chalov. Channels of different type may form the valleys of the same order but having different morphometric parameters. At the same time the valleys with identical type of channels differ from each other when their formation occurs in different types of mountain relief.
41-51 778
The tectonic origin of the crest-hollow topography at the South-East of West Siberia was set. The high quantity of bogs and lakes in the hollows are explained by their closeness to fault zones.
52-57 413
Karst topography was developed in the center of the Russian Plain during the end of Paleozoic and the beginning of Mesozoic. Reconstruction of paleorelief within the bound of Moscow shows that tropical karst topography was spread on the territory of interfluves.
58-72 547
The recent tectonic structure and fault activity of the Marckhotsky Ridge district were established on the basis of detailed geological and geomorphologic investigation with the use of remote sensing and field "trenching" data. The aim of researches had been the engineering defence of the new tunnel. The structural pattern of this region includes lengthwise and transversal faults, forming block-stepped morphostructure with the segments of structural-lithologic crests which are sunk along lengthwise and shifted along transversal faults. Recent fault activity manifests itself both in specific set of exogenous processes and in the structure of cover deposits in the fault's zones. N-E tectonic com-pression forming overturned and overthrust folds in the Paleocene-Eocene later turned into tension and normal fault system which are active till now. The velocity of recent tectonic movements reachs up to 1-1.5 mm/year, according to the surface deposits data.
73-85 521
Sediment run-off is postulated to be one of the main factors of channel processes, but detailed formulation of this state-ment is absent. The lack of reliable data on bedloacl sediments is but the least reason for this deficiency. The paper presents data, filling up this gap and considers the correlation between sediment run-off and morphodynamic types of river chan-nels. The results obtained do not contradict on the whole to existent theoretical conceptions concerning this question.
86-96 426
The hierarchical classification of Lower Volga channel landforms is put forward. The classification consists of 8 complexes and 5 classes. The class of nanoforms includes riffles; microforms - dunes and zastrugas; mezoforms -sand waves and alternate bars; macroforms - big meanders and large ramification junctions; megaforms - ramifica-tions with parallel arms or the river. The main channel of Volga and its branch - Akhtuba form a parallel-channel system. Empirical probability density of channel forms length (for each class) may be fitted well by Gamma distribu-tion; the height may by fitted by Weibull distribution.
97-106 608
Lena-Angara plateau occupies the central part of the southern projection of Siberian platform. The young uplift of plateau has non-arched character. Its cause is the accretion of layered rock masses of platform cover, detached sub-horizontally by evaporates layers. Typta-Tutur depression has a peculiar position in the young tectonics of plateau, being the reversed-straighl morphostucture.



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