RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 7, ES6002, doi:10.2205/2005ES000187, 2005

Conclusions

[87]  The results of this study demonstrate that the modern South Tien Shan structure was formed as a result of the multistage evolution (paleoocean fold-nappe region platform intracontinental orogenic belt) and of the multifactor tectonic activity, reflecting the complex interference between different geodynamic processes and structure-formation mechanisms.

[88]  Each of the major stages of this region evolution was characterized by its own geodynamic behavior, charateristics only of that particular stage. At the same time, each of these stages might have been accompanied by some particular geodynamic activity associated with or independent of the major one. These particular geodynamic processes, usually resulted in the formation of some specific structural-tectonic assemblages, and operated in some particular zones (environments) or embraced vast spaces, overlapping the effects of the main geodynamic process.

[89]  The origin of some mechanisms and conditions, both particular and general ones, was not controlled by the geological history of the previous geological epochs. As proved by this study, the geodynamic conditions of the neotectonic stage were not controlled by the geodynamic conditions which produced the nappe-fold region at the end of the Paleozoic, being of absolutely different origin. This conclusion confirms the thesis advanced earlier [Leonov, 1972, 1976] concerning the independence of the orogenic events of the geological prehistory of some or other territory.

[90]  Some geodynamic mechanisms (such as, bending or gravitational instability), operating at different stages of the geologic evolution of the region, suggest the operation of some processes which had a more general significance, compared to the common mechanisms of structure formation, associated with the effects of regional compression, extension, or pressure development. The processes of this kind are associated with the fundamental properties of the Earth and its lithosphere, such as, its gravitational instability, the 3D mobility of rock masses, and the varying stress state of the lithosphere. These processes develop during different periods of the lithosphere evolution, and in different geotectonic environments.


RJES

Citation: Leonov, M. G. (2005), The Post-Oceanic Geodynamics of the South Tien Shan Region, Russ. J. Earth Sci., 7, ES6002, doi:10.2205/2005ES000187.

Copyright 2005 by the Russian Journal of Earth Sciences

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