3D modeling of fault-zone architecture and hydraulic structure along a major Alpine wrench lineament: the Pusteria Fault.

This paper focuses on the analysis of geomorphic, structural, and behavioral characteristics along the Doruneh Fault System (DFS), east of longitude 56°45′E. Detailed geomorphic and structural analyses of different scale satellite images and digital topographic data, accompanied with field surveys allowed us to establish a fault segmentation model in which three discrete fault zones have been recognized: (1) the western fault zone (WFZ) characterized by reverse left‐lateral mechanism with left‐handed step‐over geometry, (2) the central fault zone (CFZ) which is pure left‐lateral strike‐slip and comprises nearly parallel faults, and (3) the eastern fault zone (EFZ) that is a trailing imbricate fan fault‐termination characterized by reverse faulting and fault‐related folding. Each fault zone shows discrete geometry and kinematics implying that deformation is not uniformly accommodated along the DFS. We propose a new kinematic model to explain how the DFS accommodate the Arabia‐Eurasia convergence normal to the overall fault orientation. According to this model, the DFS takes up the northward motion between central Iran–Lut block relative to Eurasia by a complex kinematics varying from pure reverse to pure left‐lateral strike‐slip faulting. The kinematics of the WFZ and EFZ corresponds to the direction of the NE‐trending regional compression. While, the partitioning of slip into strike‐slip and reverse component of faulting on parallel faults (strain partitioning) allows the CFZ to remain pure left‐lateral strike‐slip. Such a model propose a way to explain how large strike‐slip faults such as the DFS accommodate tectonic block motions perpendicular to strike of the faults.

Strain partitioning

Echelon formation

10.1029/2011tc002889

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Citations (46)

Internal architecture and earthquake rupture behavior of a long-lived intraplate strike–slip fault: A case study from the Southern Yangsan Fault, Korea

Tectonophysics (2021)

Namgwon Kim Seung-Ik Park Jin‐Hyuck Choi

Lithology

Transform fault

Earthquake rupture

10.1016/j.tecto.2021.229006

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Citations (17)

The Hospital coal basin (Massif Central, France): relay on the left-lateral strike-slip Argentat fault in relation to the Variscan postorogenic extension

BSGF – Earth Sciences Bulletin (2005)

Jean-Philippe Bellot Jean‐Yves Roig Antonin Genna

Abstract Structural and microstructural analyses of the Argentat fault, combined with sedimentological and structural analyses of the associated Hospital basin allow us to discuss the tectonic control of coal basins by crustal-scale faults during the late Palaeozoic evolution of the Variscan lithosphere in the French Massif Central. The brittle Argentat fault zone consists of first- and second-order strike-slip faults, with dominant NNW-sinistral faults, NNE-dextral or sinistral faults and secondary ENE-dextral faults. Several experimental and theoretical models explain the observed fault patterns, like en echelon faults, A-type secondary faults, conjugate faults and Riedel shears. Strike-slip faulting is responsible for folding of the metamorphic formations characterized by N-S to NE-SW-trending axis. The regional-scale geometry of brittle faults and associated folds corresponds to a positive flower structure centered on the brittle Argentat fault, combined to a negative flower structure centered on the coal basin. Using tectonic inversion software, we show that these structures result from a left-lateral movement of the brittle Argentat fault in relation to a tectonic regime intermediate between extension and strike-slip, with a horizontal NE-SW to NNE-SSW-trending maximum stretching axis. Detailed map and cross-sections, and sedimentological interpretations of the late Stephanian Hospital basin show the occurrence of intra-basin syn-sedimentary strike-slip faults and progressive overlaying, indicating that sedimentation occurs during left-lateral strike-slip faulting and folding of basement along the Argentat fault. These data are consistent with a model of N-S to NE-SW-trending postorogenic extension proposed to account for the late Carboniferous evolution of the Variscan lithosphere. They also point out the complexity and the variety of structures developed along a regional brittle strike-slip fault zone and the necessity to take into account all the structures and the resulting geometry of the basement in order to better constrain the tectonic setting of intra-continental deposits.

Massif

Pull apart basin

Echelon formation

Transtension

10.2113/176.2.151

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Citations (4)

Strain distribution at depth within continental strike-slip fault zones: an example from the Karakoram Fault Zone, NW Himalaya

AGU Fall Meeting Abstracts (2012)

David Wallis R. J. Phillips Geoffrey E. Lloyd

Strain partitioning

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