Abstract
The study of neotectonic stresses of the North Tien Shan is carried out within the northern slopes of the Kyrgyz Ridge bordering the Chyua submontane depression. The purpose of the study was to reconstruct the neotectonic stresses from the geological indicators and to compare the obtained results with the data on the present-day stress state of this region. The work is based on the analysis of the field in situ data acquired in the expeditions in 2009 and 2011. For the first time for the Northern Tien Shan region, the general (averaged) neotectonic stresses, which are distinct between the uplifts and depressions, are reconstructed. The deformation of the positive topographic features at the recent tectonic stage takes place in the conditions of thrust faulting with the meriodional horizontal compression axis and subvertical tension axis, while deformation of the negative landforms is dominated by normal faulting with the vertical compression axis and northnortheast trending subhorizontal tension axis. Based on the field data, separate sites with different types of local stress tensors, which are determined by the Lode-Nadai parameter, are revealed. The neotectonic geodynamical regime within the depressions and uplifts and the variations in the type of the stress tensor agree with the characteristics of the present-day stress state reconstructed from seismological data.
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Original Russian Text © L.A. Sim, N.A. Sycheva, V.N. Sychev, A.V. Marinin, 2014, published in Fizika Zemli, 2014, No. 3, pp. 77–91.
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Sim, L.A., Sycheva, N.A., Sychev, V.N. et al. The pattern of the paleo- and present-day stresses of Northern Tien Shan. Izv., Phys. Solid Earth 50, 378–392 (2014). https://doi.org/10.1134/S1069351314030100
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DOI: https://doi.org/10.1134/S1069351314030100