Duplex style and triangle zone formation: insights from physical modeling

Couzens-Schultz, Brent A.; Vendeville, Bruno C.; Wiltschko, David V.

doi:10.1016/s0191-8141(03)00004-x

Cited by 150 publications

(106 citation statements)

References 20 publications

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“…The strain axes for the accumulated penetrative strain were found to be a reasonable approximation to the incremental strain axes, however (Tapp and Wickham, 1987). The amount of penetrative strain accommodated in a given region is also affected by variations in lithology of the overburden, the presence and specific rheology of any detachment layers, and the dip of the base of the deforming wedge, as well as the relative location within the orogen (Mitra, 1994;Whitaker and Bartholomew, 1999;Couzens-Schultz et al, 2003;Koyi and Vendeville, 2003;Sans et al, 2003;Koyi et al, 2004;Nilforoushan and Koyi, 2007;Weil and Yonkee, 2009). Penetrative strain features can be found up to 1200 km from the active plate margin (Craddock and van der Pluijm, 1989).…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Variation in Penetrative Strain During Compression: Insights From Analog Models

Burberry

2016

Geological Society of America Abstracts With Programs

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Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Variation in Penetrative Strain During Compression: Insights From Analog Models

Burberry

2016

Geological Society of America Abstracts With Programs

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“…2, bottom). In models that comprised a salt-analogue décollement (Models 2 and 3), we reduced the lateral friction between the upper sand layers and the lateral vertical glass walls by inserting a thin, vertical film of silicone between the sidewalls and the model itself (as in Costa and Vendeville, 2002;Couzens-Schultz et al, 2003;Santolaria et al, 2015). Figure 3 illustrates, for the sake of clarity, what we mean below in terms of shallow and deep thrusts.…”

Section: Experimental Design and Proceduresmentioning

confidence: 99%

How the presence of a salt décollement in the sedimentary cover influences the behavior of subsalt thrusts in fold-and-thrust belts

Vendeville

Tang

Graveleau

et al. 2017

Bull. Soc. géol. Fr.

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-We conducted a series of analogue experiments on shortening of a brittle cover (dry sand) above a deep, thin, frictional detachment (glass microbeads). In some experiments, the cover was homogeneous, entirely brittle. In others, there was a thin viscous silicone layer (representing salt) embedded at mid height into the cover, and initially located in the foreland of the fold-and-thrust belt. Our goal was to determine whether or not the presence of such a décollement in the cover could have an impact on the mechanics and kinematics of the underlying subsalt thrusts. Results confirm that, once the front of the foldbelt reached the hinterland salt pinch out, the kinematics of the deeper belt changed drastically: its front stopped propagating forward, and most of the subsequent shortening was accommodated by a larger-than-normal slip along the foremost and youngest deep thrust, while, above the salt décollement, the deformation front propagated very fast, creating a very low surface slope. We hypothesize that it is the gentle sub-critical surface slope associated with rocksalt's low viscosity that prevents the build-up of an overall surface slope steep enough to allow the underlying, deep foldbelt to continue propagating forward. Finally, one experiment in which only one half of the width of the model comprised an interbedded viscous décollement has shown that the kinematics of the deep thrust was affected even in the adjacent salt-free domain.Keywords: salt tectonics / fold-and-thrust belts / analogue modeling / décollement Résumé -Influence de la présence d'un niveau de décollement évaporitique situé au sein de la couverture sur l'évolution des chevauchements sub-salifères profonds lors de la propagation d'une chaîne d'avant-pays. Nous avons réalisé une série d'expériences de modélisation analogique étudiant le raccourcissement d'une couverture sédimentaire constituée de matériel fragile (sable sec) enracinée sur un niveau profond frictionnel (microbilles de verre), mais comprenant localement une couche visqueuse interstratifiée de plus faible résistance mécanique (polymère de silicone). Le but de ces expériences était d'analyser l'impact d'un tel niveau de décollement visqueux superficiel sur la mécanique et la cinématique des chevauchements de la zone profonde, et notamment sur les modalités de la transmission de la déformation entre les deux niveaux de décollement. Les résultats expérimentaux confirment bien que, lorsque le front de déformation profond atteint la région où se trouve la série visqueuse interstratifiée, la cinématique des chevauchements profonds change de façon drastique. Le front de déformation profond cesse de se propager vers l'extérieur du modèle, et le chevauchement profond le plus jeune se connecte avec le niveau de décollement superficiel. Ainsi, la plus grande partie du raccourcissement est transmise aux séries superficielles de la couverture. Le front de déformation migre rapidement vers l'extérieur en se propageant sur le niveau à faible résistance mécanique. La pente topograp...

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“…It is not uncommon that backthrusts occur in the frontal part of several orogenic belts; mostly they are a part of the triangle zone and mark the boundary between the orogenic belt and undeformed foreland area (Bank and Warburton 1986;Morley 1986;MacKay et al 1996;Couzens-Schultz et al 2003;Duerto et al 2006). In our study area, the backthrust and the other thrust that form the Tunghsiao anticline to the north do not form a triangle zone; rather, they are arranged in an en echelon pattern with the transfer zone in the overlapping area.…”

Section: New Model For Fault Geometry Of the Tiehchanshan Structurementioning

confidence: 99%

The Tiehchanshan structure of NW Taiwan: A potential geological reservoir for CO2 sequestration

Kang¹,

Chuang²,

Hsieh³

et al. 2017

Terr. Atmos. Ocean. Sci.

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The Tiehchanshan structure is the largest gas-field in the outer foothills of northwestern Taiwan and has been regarded as the best site for CO 2 sequestration. This study used a grid of seismic sections and wellbore data to establish a new 3-D geometry of subsurface structure, which was combined with lithofacies characters of the target reservoir rock, the Yutengping Sandstone, to build a geological model for CO 2 sequestration. On the surface, the Tiehchanshan structure is characterized by two segmented anticlines offset by a tear fault. The subsurface geometry of the Tiehchanshan structure is, however, composed of two thrust-related anticlines with opposite vergence and laterally increasing fold symmetry toward each other. The folds are softly linked via the transfer zone in the subsurface, implying that the suspected tear fault in the surface transfer zone may not exist in the subsurface. The Yutengping Sandstone is composed of several sandstone units characterized by coarsening-upward cycles. The sandstone member can be further divided into four well-defined sandstone layers, separated by laterally continuous shale layers. In view of the structural and stratigraphic characteristics, the optimum area for CO 2 injection and storage is in the structurally high in the northern part of the Tiehchanshan structure. The integrity of the closure and the overlying seal are not disrupted by the pre-orogenic high-angle faults. On the other hand, a thick continuous shale layer within the Yutengping Sandstone isolates the topmost sandy layer from the underlying ones and gives another important factor to the CO 2 injection simulation. Article history:Received 26

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Duplex style and triangle zone formation: insights from physical modeling

Cited by 150 publications

References 20 publications

Spatial and Temporal Variation in Penetrative Strain During Compression: Insights From Analog Models

Spatial and Temporal Variation in Penetrative Strain During Compression: Insights From Analog Models

How the presence of a salt décollement in the sedimentary cover influences the behavior of subsalt thrusts in fold-and-thrust belts

The Tiehchanshan structure of NW Taiwan: A potential geological reservoir for CO2 sequestration

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