MESOZOIC-CENOZOIC INTRAMOUNTAIN BASINS OF TIEN SHAN AND WESTERN TRANSBAIKALIA: COMPARATIVE CHARACTERISTICS AND CORRELATION OF EVENTS. ARTICLE 2. INTRAMOUNTAIN BASINS OF WESTERN TRANSBAIKALIA. ANALYSIS AND GENERALIZATION OF THE DATA

Negative structures of the Earth’s crust, including intramountain basins, are key sources of information on the development of the continental crust at the plate and orogenic stages of its evolution. The aim of this study is to give a comparative description of the Mesozoic-Cenozoic basins of the Eurasian intracontinental orogen and identify regional features of the geodynamic development of its various segments. The research methodology included comparative geological analysis, structural and tectonic studies, description of lithological sections, tectonophysical experimental work, analysis of magnetotelluric sounding data. and other investigations.
This article is a logical continuation of the previously published article [Leonov et al., 2025], dealing with the description of the intramountain basins of the Gissar-Alai mountain system and the Central Tien Shan. In this study, consideration has been given to the intramountain depressions of Western Transbaikalia, and analysis has been made of general and individual features of the structure and geotectonic development of all three areas surveyed for the occurrence of similar structural ensembles within the orogenic belt.
The presented data allow us to conclude that the system of intramountain basins and interbasinal highs in Western Transbaikalia, as well as in other considered segments of the Central Asian fold belt, emerged and evolved during the Mesozoic and Cenozoic within a limited tectonic area of shear flow dispersion. A comparative analysis has been carried out to reveal common and individual features of structural evolution, as well as the nature of sedimentation and volcanism in the considered areas; there has been discussion of structural and geodynamic prerequisites for the occurrence of ordered systems of orogenic depressions within the intracontinental orogenic region at the plate stage of its development.

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