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The contemporary state of stress and strain at the western pericline of the Greater Caucasus.

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Title: The contemporary state of stress and strain at the western pericline of the Greater Caucasus.
Authors: Marinin, A.1 marinin@ifz.ru, Sim, L.1
Source: Geotectonics. Sep2015, Vol. 49 Issue 5, p411-424. 14p.
Subject Terms: *Fault zones, *Paragenesis, *Strain tensors, *Strains & stresses (Mechanics), *Axial stresses
Abstract: We collected materials on geological indicators of paleostresses at the western pericline of the Greater Caucasus mega-anticlinorium and within the large transverse flexure-fault zone (Anapa and Dzhiginka zones) limiting this mega-anticlinorium. Based on the data, we reconstructed local stress states in different tectonic zones. The reconstructed local stresses showed a considerable variation of the orientations axes of principal stress near the two zones. In a site adjacent to the flexure-fault zone and located near the western pericline of the Greater Caucasus mega-anticlinorium, the detachment systems of northeastern (NE-SW) strike are determined. Additionally, field structural studies proved elongation in the northwestern (NW-SE) direction. This was also verified by the reconstruction of orientations of minimum compression stress axes (maximum deviatory tension) implemented by cataclastic analysis of structural-kinematic information on the movements of the fault planes (tectonic cracks and minor ruptures). We found a well-expressed multistage regime of the northwestern (NW-SE) tension within the limits of the Semisam anticline. Tension deformations (along the axis of the main folded structure) are manifested in structures of different scales; the values of relative elongation are defined for some of them. At the western pericline of the Greater Caucasus mega-anticlinorium, in the Miocene deposits, a north-south (NNW) compression regime with steep inclinations of axes of maximum compression stresses was identified. In the boundary zone between the Northwestern Caucasus and transverse Kerch-Taman trough, an alteration of the orientations of main axes of normal stresses was found. These changes led to the replacement of horizontal-compression and horizontalshear (with a NE-oriented compression) settings, which are predominant in the Caucasus, with settings of horizontal tension (with steep NNW-oriented compression axes). [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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An: 110262130
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  Data: The contemporary state of stress and strain at the western pericline of the Greater Caucasus.
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  Data: <searchLink fieldCode="JN" term="%22Geotectonics%22">Geotectonics</searchLink>. Sep2015, Vol. 49 Issue 5, p411-424. 14p.
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  Data: *<searchLink fieldCode="DE" term="%22Fault+zones%22">Fault zones</searchLink><br />*<searchLink fieldCode="DE" term="%22Paragenesis%22">Paragenesis</searchLink><br />*<searchLink fieldCode="DE" term="%22Strain+tensors%22">Strain tensors</searchLink><br />*<searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br />*<searchLink fieldCode="DE" term="%22Axial+stresses%22">Axial stresses</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: We collected materials on geological indicators of paleostresses at the western pericline of the Greater Caucasus mega-anticlinorium and within the large transverse flexure-fault zone (Anapa and Dzhiginka zones) limiting this mega-anticlinorium. Based on the data, we reconstructed local stress states in different tectonic zones. The reconstructed local stresses showed a considerable variation of the orientations axes of principal stress near the two zones. In a site adjacent to the flexure-fault zone and located near the western pericline of the Greater Caucasus mega-anticlinorium, the detachment systems of northeastern (NE-SW) strike are determined. Additionally, field structural studies proved elongation in the northwestern (NW-SE) direction. This was also verified by the reconstruction of orientations of minimum compression stress axes (maximum deviatory tension) implemented by cataclastic analysis of structural-kinematic information on the movements of the fault planes (tectonic cracks and minor ruptures). We found a well-expressed multistage regime of the northwestern (NW-SE) tension within the limits of the Semisam anticline. Tension deformations (along the axis of the main folded structure) are manifested in structures of different scales; the values of relative elongation are defined for some of them. At the western pericline of the Greater Caucasus mega-anticlinorium, in the Miocene deposits, a north-south (NNW) compression regime with steep inclinations of axes of maximum compression stresses was identified. In the boundary zone between the Northwestern Caucasus and transverse Kerch-Taman trough, an alteration of the orientations of main axes of normal stresses was found. These changes led to the replacement of horizontal-compression and horizontalshear (with a NE-oriented compression) settings, which are predominant in the Caucasus, with settings of horizontal tension (with steep NNW-oriented compression axes). [ABSTRACT FROM AUTHOR]
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        Value: 10.1134/S0016852115040068
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 14
        StartPage: 411
    Subjects:
      – SubjectFull: Fault zones
        Type: general
      – SubjectFull: Paragenesis
        Type: general
      – SubjectFull: Strain tensors
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Axial stresses
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      – TitleFull: The contemporary state of stress and strain at the western pericline of the Greater Caucasus.
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              M: 09
              Text: Sep2015
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              Y: 2015
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              Value: 49
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