Geometry and kinematics of inversion tectonics

Williams, G. D.; Powell, C. M.; Cooper, Mark A.

doi:10.1144/gsl.sp.1989.044.01.02

Cited by 295 publications

(196 citation statements)

References 6 publications

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“…positively inverted) extensional fault (e.g. Sibson, 1985;Williams et al, 1989). The fault flanks to the NE an about 5 km-wide gentle syncline affected by lowdisplacement (i.e.…”

Section: Ne-sw Geological Cross-sectionmentioning

confidence: 99%

The seismogenic fault system of the 2017 Mw 7.3 Iran-Iraq earthquake: constraints from surface and subsurface data, cross-section balancing and restoration

Tavani¹,

Parente²,

Puzone³

et al. 2018

Preprint

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The 2017 Mw 7.3 Iran-Iraq earthquake occurred in a region where the pattern of major plate convergence is well constrained, but limited information is available on the seismogenic structures. Geological observations, interpretation of seismic reflection profiles, and well data are used in this paper to build a regional balanced cross-section that provides a comprehensive picture of the geometry and dimensional parameters of active faults in the hypocentral area. Our results indicate: (i) coexistence of thin-and thick-skinned thrusting, (ii) reactivation of inherited structures, and (iii) occurrence of weak units promoting heterogeneous deformation within the Paleo-Cenozoic sedimentary cover and partial decoupling from the underlying basement. According to our study, the main shock of the

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“…positively inverted) extensional fault (e.g. Sibson, 1985;Williams et al, 1989). The fault flanks to the NE an about 5 km-wide gentle syncline affected by lowdisplacement (i.e.…”

Section: Ne-sw Geological Cross-sectionmentioning

confidence: 99%

The seismogenic fault system of the 2017 Mw 7.3 Iran-Iraq earthquake: constraints from surface and subsurface data, cross-section balancing and restoration

Tavani¹,

Parente²,

Puzone³

et al. 2018

Preprint

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“…5 and 13a), associated with an anticline grown in the hanging wall of the fault hanging-wall block inversion (see Williams et al 1989;McClay and Buchanan 1992) that could be interpreted as an incipient floor thrusting of the Gela Nappe. Fig.…”

Section: Main Tectonic Structuresmentioning

confidence: 99%

Evidence of positive tectonic inversion in the north-central sector of the Sicily Channel (Central Mediterranean)

et al. 2016

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In order to unravel the tectonic evolution of the north-central sector of the Sicily Channel (Central Mediterranean), a seismo-stratigraphic analysis of single-and multichannel seismic reflection profiles has been carried out. This allowed to identify, between 20 and 50 km offshore the central-southern coast of Sicily, a *80-km-long deformation belt, characterized by a set of WNW-ESE to NW-SE fault segments showing a polyphasic activity. Within this belt, we observed: i) Miocene normal faults reactivated during Zanclean-Piacenzian time by dextral strike-slip motion, as a consequence of the AfricaEurope convergence; ii) releasing and restraining bend geometries forming well-developed pull-apart basins and compressive structures. In the central and western sectors of the belt, we identified local transpressional reactivations of Piacenzian time, attested by well-defined compressive features like push-up structures and fault-bend anticlines. The reconstruction of timing and style of tectonic deformation suggest a strike-slip reactivation of inherited normal faults and the local subsequent positive tectonic inversion, often documented along oblique thrust ramps. This pattern represents a key for an improved knowledge of the structural style of foreland fold-and-thrust belts propagating in a preexisting extensional domain. With regard to active tectonics and seismic hazards, recent GPS data and local seismicity events suggest that this deformation process could be still active and accomplished through deep-buried structures; moreover, several normal faults showing moderate displacements have been identified on top of the Madrepore Bank and Malta High, offsetting the Late Quaternary deposits. Finally, inside the northern part of the

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“…Positive basin inversion involves the partial or total reversal of motion on extensional faults subjected to superimposed compressional stresses (Williams et al, 1989). The phenomenon of basin inversion has been documented worldwide.…”

Section: Introductionmentioning

confidence: 99%

The role of inherited extensional fault segmentation and linkage in contractional orogenesis: a reconstruction of Lower Cretaceous inverted rift basins in the Eastern Cordillera of Colombia

Mora¹,

Gaona²,

Kley³

et al. 2009

Basin Research

101

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Lower Cretaceous early syn-rift facies along the eastern £ank of the Eastern Cordillera of Colombia, their provenance, and structural context, reveal the complex interactions between Cretaceous extension, spatio -temporal trends in associated sedimentation, and subsequent inversion of the Cretaceous Guatiqu|¤ a paleo -rift. South of 4130 0 N lat, early syn-rift alluvial sequences in former extensional footwall areas were contemporaneous with fan-delta deposits in shallow marine environments in adjacent hanging-wall areas. In general, footwall erosion was more pronounced in the southern part of the paleorift. In contrast, early syn-rift sequences in former footwall areas in the northern rift sectors mainly comprise shallow marine supratidal sabkha to intertidal strata, whereas hanging-wall units display rapid transitions to open-sea shales. In comparison with the southern paleo -rift sector, fan-delta deposits in the north are scarce, and provenance suggests negligible footwall erosion.The southern graben segment had longer, and less numerous normal faults, whereas the northern graben segment was characterized by shorter, rectilinear faults.To the east, the graben system was bounded by major basin-margin faults with protracted activity and greater throw as compared with intrabasinal faults to the west. Intrabasinal structures grew through segment linkage and probably interacted kinematically with basin-margin faults. Basin-margin faults constitute a coherent fault system that was conditioned by pre-existing basement fabrics. Structural mapping, analysis of present-day topography, and balanced cross sections indicate that positive inversion of extensional structures was focused along basin-bounding faults, whereas intrabasinal faults remained una¡ected and were passively transported by motion along the basin-bounding faults.Thus, zones of maximum subsidence in extension accommodated maximum elevation in contraction, and former topographic highs remained as elevated areas.This documents the role of basin-bounding faults as multiphased, long-lived features conditioned by basement discontinuities. Inversion of basinbounding faults was more e⁄cient in the southern than in the northern graben segment, possibly documenting the inheritance and pivotal role of fault-displacement gradients. Our observations highlight similarities between inversion features in orogenic belts and intra-plate basins, emphasizing the importance of the observed phenomena as predictive tools in the spatiotemporal analysis of inversion histories in orogens, as well as in hydrocarbon and mineral deposits exploration.

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Geometry and kinematics of inversion tectonics

Cited by 295 publications

References 6 publications

The seismogenic fault system of the 2017 <i>M<sub>w</sub></i> 7.3 Iran-Iraq earthquake: constraints from surface and subsurface data, cross-section balancing and restoration

The seismogenic fault system of the 2017 <i>M<sub>w</sub></i> 7.3 Iran-Iraq earthquake: constraints from surface and subsurface data, cross-section balancing and restoration

Evidence of positive tectonic inversion in the north-central sector of the Sicily Channel (Central Mediterranean)

The role of inherited extensional fault segmentation and linkage in contractional orogenesis: a reconstruction of Lower Cretaceous inverted rift basins in the Eastern Cordillera of Colombia

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Geometry and kinematics of inversion tectonics

Cited by 295 publications

References 6 publications

The seismogenic fault system of the 2017 &lt;i&gt;M&lt;sub&gt;w&lt;/sub&gt;&lt;/i&gt; 7.3 Iran-Iraq earthquake: constraints from surface and subsurface data, cross-section balancing and restoration

The seismogenic fault system of the 2017 &lt;i&gt;M&lt;sub&gt;w&lt;/sub&gt;&lt;/i&gt; 7.3 Iran-Iraq earthquake: constraints from surface and subsurface data, cross-section balancing and restoration

Evidence of positive tectonic inversion in the north-central sector of the Sicily Channel (Central Mediterranean)

The role of inherited extensional fault segmentation and linkage in contractional orogenesis: a reconstruction of Lower Cretaceous inverted rift basins in the Eastern Cordillera of Colombia

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About

The seismogenic fault system of the 2017 <i>M<sub>w</sub></i> 7.3 Iran-Iraq earthquake: constraints from surface and subsurface data, cross-section balancing and restoration

The seismogenic fault system of the 2017 <i>M<sub>w</sub></i> 7.3 Iran-Iraq earthquake: constraints from surface and subsurface data, cross-section balancing and restoration