Use of the kinematic method for reconstruction of stress fields and mechanisms of the structure development in Donbas (on an example of the western closure of the Horlovka anticline)

: pp. 47 - 54
Received: March 24, 2015
Donetsk National Technical University
Far Eastern Federal University, School of Engineering

Purpose. This study focuses on the analysis of structures and kinematics of the western closure of the Horlovka anticline to present a general development mechanism and to determine whether the structural complexity of the study area is consistent with a single regional stress field or not. Methodology. The kinematic and structural data available for the study zone have been studied. Further, fault data, including both the fault plane and slickenline orientations, and the sense of movement, have been studied by the kinematic analysis method of O. Gushchenko to estimate characteristics of the mesoregional stress field. Local stress data have been processed by the method for determination of general stress fields provide for reconstruction of main normal stresses which are arbitrarily considered as regional stresses. Results. Strike-slip faults (NW-trending, dextral; N–S and NE-trending, sinistral) prevail among the other faults. Mesoregional stress field characterized by subhorizontal NW–SE maximum and NE–SW minimum principal axes, and apparently originated in Laramide time of Alpine orogeny is shear type and the youngest for the Donets Basin. The pattern of a single structural paragenesis of deformation elements of the study area, including a conjugate strike-slip fault system, dome-shaped fold and longitudinal thrusts in its limbs, was developed due to the right-lateral displacements along the longitudinal strike-slip fault system within the Main anticline paraxial part. Originality. Strike-slip faults and large shear zone are revealed in the structure of the study area, and characterized its morphology, development, and interaction of structural elements in zone of distributed shear deformation. The primary characteristics of the stress fields of local and mesoregional level are reconstructed. Practical significance. Taking importance of the results obtained by the kinematic method into account, applying of the methods based on reconstruction of primary tectonophysical characteristics and restoration of deformation mechanisms will allow better prediction of the small-scale faulting and outburstable zones. 

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