Evolution of E-W strike-slip fault network, the northwestern foreland of Tunisia
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Basement
Echelon formation
Echelon formation
Transtension
Transpression
Transform fault
Extensional fault
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Abstract Late Jurassic‐Early Cretaceous strike‐slip faults play an important role in basin formation and igneous activities in eastern China and the adjacent areas. Because of the lack of seismic data, their distribution and effect on the formation of basins and igneous activities in the Subei‐South Yellow Sea Basin (SB‐SYSB) are still poorly understood. In this study, based on systematic analyses of the acquired seismic data, the Late Jurassic‐Early Cretaceous strike‐slip faults in the SB‐SYSB were identified and characterized. The strike‐slip faults can be divided into two sets, a NE‐NNE trending sinistral strike‐slip fault system and a NW trending dextral fault system. They present in seismic sections as a flower structure or Y/V‐shaped structure, respectively. In map view, they show horsetail splay faults, en echelon reverse faults, pull‐apart structure, linear structure, or curvilinear structure. These faults resulted in different types of subbasins in the SB‐SYSB, such as transpressional/transtensional subbasins and pull‐apart subbasins. The close relationship between the strike‐slip faults and the distribution of igneous rocks in the SB‐SYSB suggest that the strike‐slip faults probably acted as efficient pathways for magma intrusion during the Late Jurassic‐Early Cretaceous. The sinistral displacement was characterized by thrusting‐folding deformation structures, which show a tendency to decrease toward the Sulu orogenic belt, indicating that the Sulu orogenic belt has probably weakened the strike‐slip movement in the basin. We infer that the sinistral strike‐slip movement in the SB‐SYSB was most likely controlled by the subduction of the paleo‐Pacific plate and the Tan‐Lu strike‐slip faulting.
Echelon formation
Transtension
Transform fault
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Three main NNE-striking strike-slip faults are developed in JZ27-33 block of Liaodong Bay,i.e.,Liaozhong 3 fault(or Liaozhong 1 fault),Liaozhong 2 fault and Liaodong 2 fault.These 3 faults assume en echelon distribution on the plane,with many secondary normal faults of strike-slipping nature developed between them.These normal faults strike NE or NEE and obliquely intersect main strike-slip faults,and the sharp angle between them indicates the corresponding stratigraphic moving direction on the plane.Negative flower structure is another important feature of the giant strike-slip faults.It is therefore concluded that the faults of the study area have characteristics of on the plane and negative flower structure on the cross-section,and that the faults in JZ27-33 block of Liaodong Bay formed a typical extensional dextral strike-slip duplex system,with the main controlling factors composed of the dextral strike-slip and plane distribution of Tanlu fault,the multi-phase tectonic movement and the brittle sedimentary layers.
Transform fault
Echelon formation
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The 'Scotiadalen Fault'appears on many maps but has not been identified as a single fault in the field. In addition, the sense of motion on the fault has been an open question. Here I show that this structure is a zone of distributed dextral strike-slip that is probably the result of Tertiary plate motion as the North Atlantic opened. As such it is one of the very few fault zones documented to show direct evidence of dextral, presumably Tertiary, strike-slip.
Transform fault
Echelon formation
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Transpression
Transtension
Echelon formation
Strain partitioning
Transform fault
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Strike-slip faults and associated tectonic structures have been investigated in the Holy Cross Mountains fold belt (HCM), which is located eastwards of the Variscan foreland basin. The strike-slip fault sets form a complex network, which developed during two faulting stages: in Late Palaeozoic (I) and Maastrichtian/Palaeocene (II) times. The Late Palaeozoic fault pattern formed as a result of at least two strike-slip events: I-1 and I-2. During the first event (I-1), a N–S-striking dextral strike-slip fault set and a NNE–SSW to NE–SW-striking sinistral strike-slip fault set developed. During the next event (I-2), dextral strike slip occurred along the WNW–ESE-striking longitudinal master faults and formed a NW–SE to NNW–SSE-striking sinistral secondary strike-slip fault set. During this event, in zones north and south of the Holy Cross Fault, faultbounded blocks developed which were rotated dextrally as a result of further displacements. The strikeslip fault network was overprinted during the Maastrichtian/Palaeocene second strike-slip stage (II).
Transform fault
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Echelon formation
Transtension
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This paper presents a simplified evolution for the Slavonian Mts. structural fabric during the Neogene, emphasising the importance of the sinistral wrench faults. These faults were formed under the influence of dextral displacements along the faults stretching through the Drava and Sava. They caused the uplift and compression of the general area of the Slavonian Mts. These events were accompanied by folding, reverse faulting and counter-clockwise rotation of the uplifted structures, typical for the transpression model and wrench tectonic processes.
Wrench
Transpression
Echelon formation
Neogene
Clockwise
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Dextral strike-slip movement on the Sticklepath-Lustleigh fault zone (SLFZ) is indicated by displacements of ?Permian and older rocks. Previous authors have inferred that the main dextral movement which caused these displacements was post- Permian and, noting the presence of small Tertiary pull-apart basins along the fault zone, probably of Tertiary age. However, the geometry of these early Tertiary pull-apart basins indicates sinistral rather than dextral strike-slip movement. We present an alternative model for the history of the Sticklepath-Lustleigh fault zone, summarized below: 1 Late Variscan strike-slip movement, with a total displacement of up to 10 km, produced the SLFZ and offset dextrally an earlier Variscan thrust. 2. Extensional reactivation of this thrust led to rapid Permo-Triassic subsidence in the Crediton Trough and a dextrally offset neighbour, the Hatherleigh outlier. 3. Approximately 6 km of early Tertiary sinistral movement on the SLFZ produced small pull-apart sedimentary basins, and reduced the net dextral offset across the fault. 4. In mid-Tertiary times, minor dextral movements on the SLFZ may have produced reverse faulting on the margins of the Tertiary basins.
Normal fault
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