Structural evolution of the Piqiang Fault Zone, NW Tarim Basin, China

Turner, Sebastian A.; Guo, Liu; Cosgrove, John

doi:10.1016/j.jseaes.2010.06.005

Cited by 26 publications

(13 citation statements)

References 27 publications

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“…We estimated values of 1.0 +0.2 / −0.2 mm/year and 1.0 +1.2 / −0.3 mm/year for the shortening rate in the eastern part of the Kalpin structure based on our shortening rate of ~ 0.3 mm/year across the eastern Kepingtage fault, a shortening rate of ~ 0.4 mm/year for the Saergantage fault, and a similar rate for the Kalabukesai fault (Li et al 2011). Turner et al (2011) obtained similar results for the Piqiang fault. Although the Piqiang fault likely did not initiate by differential strain rates across the Kalpin structure, the Piqiang fault in the current strain regime forms a tear fault in the Kalpin thrust structure.…”

Section: Comparison With Geodetic and Seismic Datasupporting

confidence: 57%

“…We focused on the segmentation features of the Kepingtage fault and the significance of the Piqiang fault deformation reflected by the segmentation features. Our results improve the understanding of the deformation of the Kalpin structure and the Piqiang fault, which is a tear fault (Turner et al 2011). This structure transfers crustal shortening to strike-slip that results in the different shortening rates of the western and eastern segments.…”

Section: Introductionmentioning

confidence: 52%

“…These strike-slip earthquakes might relate to several NW fault by the difference crustal shortening transferring to strike-slip. Seismic reflection profiles show that the interior of the Tarim block has several NW and NWW faults, including the Selibuya and the Mazatag faults, which represent the boundary of the Bachu uplift (Liu et al 2004;Xiao et al 2005;Ding et al 2008;Turner et al 2011). The Bachu uplift was a major intrabasinal high that partitioned the Tarim basin into two isolated depocenters throughout the Jurassic and Early Cretaceous (Allen et al 1999;Sobel 1999;Yang and Guo 2003;Yang et al 2008a;Turner et al 2011).…”

Section: Geological Structure and Shortening Of The Kalpin Thrust Strmentioning

confidence: 99%

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Segmentation of the Kepingtage thrust fault based on paleoearthquake ruptures, southwestern Tianshan, China

Ran

Gomez

et al. 2020

Nat Hazards

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Decreasing deformation rates across the southern Tianshan have led to different seismogenic mechanisms and different proposed models to explain the orogen-scale fault kinematics. In this study, we focus on the segmentation of the Kepingtage fault by studying variations in the total offset and shortening rates of the Kepingtage fault along the southern front of the Tianshan. We used fault scarp mapping and trench excavations to assess fault segmentation and deformation on the Kepingtage fault. Our results indicate there are different shortening rates on the western (2.5-2.7 mm/year) versus the eastern segments (~ 0.3 mm/year), which are separated by the Piqiang tear fault. The decrease in shortening rates is not gradual; instead, it decreases sharply from west to east at the Piqiang fault. These segmentation boundaries are also supported by geodetic data and balanced structural restorations. Our data support a model where strike-slip faults accommodate step-changes in the deformation rates and the earthquake risks from west to east across the Tianshan.

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Section: Comparison With Geodetic and Seismic Datasupporting

confidence: 57%

Section: Introductionmentioning

confidence: 52%

Section: Geological Structure and Shortening Of The Kalpin Thrust Strmentioning

confidence: 99%

See 1 more Smart Citation

Segmentation of the Kepingtage thrust fault based on paleoearthquake ruptures, southwestern Tianshan, China

Ran

Gomez

et al. 2020

Nat Hazards

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show abstract

“…Although strike-slip reactivation is reported in the literature (e.g. Hartz & Andresen, 1995;Kim, 1996;Aris et al, 1998;Balaguru et al, 2003;Faure et al, 2006;Ducea et al, 2009;Jankowski & Probulski, 2011;Turner et al, 2011;Firth et al, 2015), detailed descriptions of the strike-slip reactivation of normal faults (Van Noten et al, 2013) and the associated effects of reactivation on along-strike transfer zones (Barton et al, 1998;Preprint of paper published in Basin Research (http://dx.doi.org/10.1111/bre.12303) Kelly et al, 1999;Zampieri & Massironi, 2007) are scarce. Thus, an understanding of key features and typical structures produced during strike-slip reactivation of normal faults is currently lacking.…”

Section: Preprint Of Paper Published In Basinmentioning

confidence: 99%

Strike-slip reactivation of segmented normal faults: implications for basin structure and fluid flow

Rotevatn¹,

Peacock²

2018

Preprint

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Reverse reactivation of normal faults, also termed ‘inversion’, has been extensively studied, whereas little is known about the strike-slip reactivation of normal faults. At the same time, recognizing strike-slip reactivation of normal faults in sedimentary basins is critical, as it may alter and impact basin physiography, accommodation and sediment supply and dispersal. Motivated by this, we present a study of a reactivated normal fault zone in the Liassic limestones and shales of Somerset, UK, to elucidate the effects of strike-slip reactivation of normal faults, and the inherent deformation of relay zones that separate the original normal fault segments. The fault zone, initially extensional, exhibits a series of relay zones between right-stepping segments, with the steps between the segments having subsequently become contractional due to sinistral strike-slip movement. The relay zones have therefore been steepened and are cut by a series of connecting faults with reverse and strike-slip components. The studied fault zone, and comparison with larger-scale natural examples, lead us to conclude that the relays-turned-contractional-steps are associated with (i) complex fault and fracture networks that accommodate shortening, (ii) anomalously high numbers of fractures and faults, (iii) layer parallel slip and (iv) folding and uplift. Comparison with published statistics from global relay zones shows that whereas the reactivated relay zones feature aspect ratios similar to those of unreactivated relay zones, bed dips within reactivated relay zones are significantly steeper than unreactivated relay zones. Given the potential of reactivated relay zones to form areas of local uplift, they may affect basin structure and may also form potential traps for hydrocarbon or other fluids. The elevated faulting and fracturing, on the other hand, means reactivated relays are also likely loci for enhanced up-fault flow.

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“…Although strike-slip reactivation is reported in the literature (e.g. Aris, Coiffait, & Guiraud, 1998;Balaguru, Nichols, & Hall, 2003;Ducea, Kidder, Chesley, & Saleeby, 2009;Faure, Tremblay, Malo, & Angelier, 2006;Firth et al, 2015;Hartz & Andresen, 1995;Jankowski & Probulski, 2011;Kim, 1996;Turner, Liu, & Cosgrove, 2011), detailed descriptions of the strike-slip reactivation of normal faults (Van Noten et al, 2013) and the associated effects of reactivation on along-strike transfer zones (Barton, Evans, Bristow, Freshney, & Kirby, 1998;Kelly, McGurk, Peacock, & Sanderson, 1999 Massironi, 2007) are scarce. Thus, an understanding of key features and typical structures produced during strike-slip reactivation of normal faults is currently lacking.…”

mentioning

confidence: 99%

Strike‐slip reactivation of segmented normal faults: Implications for basin structure and fluid flow

Rotevatn

Peacock

2018

Basin Research

View full text Add to dashboard Cite

Reverse reactivation of normal faults, also termed “inversion”, has been extensively studied, whereas little is known about the strike‐slip reactivation of normal faults. At the same time, recognizing strike‐slip reactivation of normal faults in sedimentary basins is critical, as it may alter and impact basin physiography, accommodation and sediment supply and dispersal. Motivated by this, we present a study of a reactivated normal fault zone in the Liassic limestones and shales of Somerset, UK, to elucidate the effects of strike‐slip reactivation of normal faults, and the inherent deformation of relay zones that separate the original normal fault segments. The fault zone, initially extensional, exhibits a series of relay zones between right‐stepping segments, with the steps between the segments having subsequently become contractional due to sinistral strike‐slip movement. The relay zones have therefore been steepened and are cut by a series of connecting faults with reverse and strike‐slip components. The studied fault zone, and comparison with larger‐scale natural examples, leads us to conclude that the relays turned contractional steps are associated with (a) complex fault and fracture networks that accommodate shortening, (b) anomalously high numbers of fractures and faults, (c) layer‐parallel slip and (d) folding and uplift. Comparison with published statistics from global relay zones shows that whereas the reactivated relay zones feature aspect ratios similar to those of unreactivated relay zones, bed dips within reactivated relay zones are significantly steeper than unreactivated relay zones. Given the potential of reactivated relay zones to form areas of local uplift, they may affect basin structure and may also form potential traps for hydrocarbon or other fluids. The elevated faulting and fracturing, on the other hand, means reactivated relays are also likely loci for enhanced up‐fault flow.

show abstract

Structural evolution of the Piqiang Fault Zone, NW Tarim Basin, China

Cited by 26 publications

References 27 publications

Segmentation of the Kepingtage thrust fault based on paleoearthquake ruptures, southwestern Tianshan, China

Segmentation of the Kepingtage thrust fault based on paleoearthquake ruptures, southwestern Tianshan, China

Strike-slip reactivation of segmented normal faults: implications for basin structure and fluid flow

Strike‐slip reactivation of segmented normal faults: Implications for basin structure and fluid flow

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