Reactivated strike–slip faults: examples from north Cornwall, UK

Kim, Young‐Seog; Andrews, J. R.; Sanderson, David J.

doi:10.1016/s0040-1951(01)00146-9

Cited by 73 publications

(36 citation statements)

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“…These can either be conjugate fault sets (e.g., Zhao and Johnson, 1991;Nicol et al, 1995;Ferrill et al, 2009;Nixon et al, 2011) that formed in the same stress system, or multiple fault sets that form from the overprinting of two or more stress systems (Davatzes et al, 2003;Bailey et al, 2005). The latter can form new faults with different orientations and/or cause reactivation of pre-existing faults (e.g., Kim et al, 2001), which can also have a strong influence on the development of later fault sets (e.g., Segall and Pollard, 1983;Bailey et al, 2005). Hence, complex cross-cutting relationships and interactions can form between fault sets.…”

Section: Introductionmentioning

confidence: 99%

Fault interactions and reactivation within a normal-fault network at Milne Point, Alaska

Nixon¹,

Sanderson²,

Dee³

et al. 2014

Bulletin

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A normal-fault network from Milne Point, Alaska, is investigated focusing on characterizing geometry, displacement, strain, and different fault interactions. The network, constrained from threedimensional seismic reflection data, comprises two generations of faults: Cenozoic north-northeast-trending faults and Jurassic west-northwest-trending faults, which highly compartmentalize Upper Triassic to Lower Cretaceous reservoirs. The west-northwest-trending faults are influenced by a similarly oriented underlying structural grain. This influence is characterized by increases in throw on several faults, strain localization, reorientation of faults and an increase in linkage maturity.Reconstructing fault plane geometries and mapping spatial variations in throw identified key characteristic features in their interactions and reactivation of pre-existing structures. Faults are divided into isolated, abutting, and splaying faults. Isolated faults exhibit a range of displacement profiles depending on the degree of restriction at fault tips. Fault splays accommodate step-like decreases in throw along larger main faults with a throw maximum at the intersection with the main fault. Throw profiles of abutting faults are divided into two groups: early stage abutting faults with throw minima at both the isolated and abutting tips, and developed abutting faults with throw maxima near the abutting tip.Developed abutting faults accumulate throw after initial abutment, locally reactivating and transferring throw onto the preexisting fault. Two abutting faults can link kinematically by Stephen Dee is a senior structural geologist at BP, working in the Integrated Subsurface Description and Modelling team and consulting on structural and geomechanics projects. He has a Ph.D. from the University of Southampton and specializes in fault and fracture interpretation, geomechanical modeling, and seal analysis.

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Section: Introductionmentioning

confidence: 99%

Fault interactions and reactivation within a normal-fault network at Milne Point, Alaska

Nixon¹,

Sanderson²,

Dee³

et al. 2014

Bulletin

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“…The reason for focusing such high concentration of the partially molten rocks in the relay zone is probably due to the fact that the tangential component of velocity boundary conditions can help produce linking damage/weak zones (Kim et al, 2004) around a strike-slip fault zone. The linking 30 damage/weak zones evolve and become matured through the interaction between the tips of adjacent faults (Kim et al, 2001), undergoing a process from a soft linkage to a hard linkage. These damage/weak zones (in the relay zone between faults) could make a direct contribution to concentrating partially molten rocks during transtension (extension), this process could Solid Earth Discuss., https://doi.org/10.5194/se-2017-142 Manuscript under review for journal Solid Earth Discussion started: 30 January 2018 c Author(s) 2018.…”

Section: 2)mentioning

confidence: 99%

“…This indicates that the linked high strain zones are not predominant sites (blue line of Model B) to concentrate strain over time in transtension. We propose that the linked high strain zones resulted from the initial re-activation (blue line in Model B, Figure 10) would be reprinted and overlapped during transtension (Kim et al, 2001). This probably can help explain the early peaks of vertical velocity observed in Model B (Figure 9).…”

mentioning

confidence: 98%

“…At a fault tip, it commonly has a maximum stress concentration (e.g., Cowie and Scholz, 1992;Vermilye and Scholz, 1999;Gupta and Scholz, 2000). The interaction between the tips of faults leads to the growth, propagation and maturation of faults (Kim et al, 2001). 10…”

mentioning

confidence: 99%

“…In Model A (Figure 10), nodes n and p (tips of faults) must intensely interact with a high stress concentration (e.g., Soliva et al, 2008) resulting in linking each other through fractures (Kim et al, 2001(Kim et al, , 2004 when they are initially re-activated. After the re-activation, we can ideally mark the linked fractures as the blue line ( Figure 10) according to the analogue (Peacock and Parfitt, 2002;Bellahsen and Deniel, 2005), numerical modelling (Soliva et al, 2008) and field investigations (Acocella 15 et al, 2000;Hus et al, 2006;Giba et al, 2012).…”

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confidence: 99%

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3D numerical modelling of the re-distribution of partially molten lower crust rocks in relay zones between faults during transtension: Implications for the Sefwi terrane, SW Ghana

Feng

Wang

Ganne

et al. 2018

Preprint

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Abstract. High-grade tectono-metamorphic domains in the Sefwi terrane of Ghana are separated from adjacent low-grade greenstone belts by two main shear zones. The high-grade rocks are thought to have been exhumed along sinistral shear zones during the D2 ENE-WSW transtension. To better understand the role boundary conditions and the spatial relationship of faults play in the re-distribution of partially molten lower crust, ten 3D thermo-mechanical models have been constructed.The results show that the normal component of velocity boundary conditions mainly controls the exhumation of the lower 15 crust which occurred along pre-existing faults, while the exhumation in the relay zones between faults is controlled by the ratio of extension rate to shear rate applied at the boundaries. The strike of the exhumation belt made of partially molten lower crust rocks in the relay zone is sub-orthogonal to the transtension direction. The isostatic compensation from lowdensity upper mantle to overlying crust (thinning) is higher under transtension than under extension. 20The lower crust exhumation influenced by inherited shear zones can be used to better understand the loci of the high-grade rocks in the Sefwi terrane. We suggest that the Kukuom-Juaboso domain composed of up to amphibolite-migmatite facies probably resulted from the concentration of partially molten rocks in the relay zone between the Ketesso and Kenyase shear zones during the D2 ENE-WSW transtension. The two shear zones probably underwent two main stages for growth and maturation from the D1 to D2 deformation phases. The regional exhumation of the high-grade rocks in the Sefwi terrane 25 probably occurred within a duration of less than 5Ma.

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Tectonic reversal of the western Doruneh Fault System: Implications for Central Asian tectonics

et al. 2015

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The left-lateral Doruneh Fault System (DFS) bounds the north margin of the Central Iranian microplate and has played an important role in the structural evolution of the Turkish-Iranian plateau. The western termination of the DFS is a sinistral synthetic branch fault array that shows clear kinematic evidence of having undergone recent slip sense inversion from a dextral array to a sinistral array in the latest Neogene or earliest Quaternary. Similarly, kinematic evidence from the Anarak Metamorphic complex suggests that this complex initially developed at a transpressive left-stepping termination of the DFS and that it was inverted in the latest Neogene to a transtensional fault termination. The recognition that the DFS and other faults in NE Iran were inverted from dextral to sinistral strike slip in the latest Neogene and the likely connection between the DFS and the Herat Fault of Afghanistan suggests that prior to the latest Miocene, all of the north Iranian and northern Afghan ranges were part of a distributed dextral fault network that extended from the west Himalayan syntaxes to the western Alborz. Also, the recognition that regional slip sense inversion occurred across northern and northeastern Iran after the latest Miocene invalidates tectonic models that extrapolate Pleistocene to recent fault slip kinematics and rates back beyond this time.

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Reactivated strike–slip faults: examples from north Cornwall, UK

Cited by 73 publications

References 50 publications

Fault interactions and reactivation within a normal-fault network at Milne Point, Alaska

Fault interactions and reactivation within a normal-fault network at Milne Point, Alaska

3D numerical modelling of the re-distribution of partially molten lower crust rocks in relay zones between faults during transtension: Implications for the Sefwi terrane, SW Ghana

Tectonic reversal of the western Doruneh Fault System: Implications for Central Asian tectonics

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