Spatial variations of ductile strain in fold-and-thrust belts: From model to nature

Roy, Sreetama; Bose, Santanu; Saha, Puspendu

doi:10.1016/j.jsg.2020.104012

Cited by 7 publications

(2 citation statements)

References 132 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous modeling studies of accretionary wedges have employed physical analog modeling (e.g., Bigi et al, 2010;Ghosh et al, 2020;Gutscher et al, 1996;Koyi, 1995;Lohrmann et al, 2003;Mulugeta & Koyi, 1992;Roy et al, 2020;Saha et al, 2016), work optimization or mechanical approaches to predict the wedge geometry and faulting (Burbidge & Braun, 2002;Cooke & Madden, 2014;Cubas et al, 2008;Del Castello & Cooke, 2007;Gutscher et al, 1998a;Hardy et al, 1998;Leroy & Maillot, 2016;Maillot & Koyi, 2006;Mary et al, 2013;McBeck et al, 2017;Platt, 1986Platt, , 1988Souloumiac et al, 2009Souloumiac et al, , 2010Yagupsky et al, 2014), and numerical simulations (del Castillo et al, 2021;Ito & Moore, 2021;Naylor & Sinclair, 2007;Ruh et al, 2012;Ruh, 2020;Simpson, 2010Simpson, , 2011Stockmal et al, 2007). Early analog modeling studies revealed that the accretion process is episodic rather than steady state (Mulugeta & Koyi, 1992), meaning the wedge does not maintain its original (Mantilla-Pimiento et al, 2009;Rodríguez et al, 2021).…”

Section: Previous Modeling Studies Of Accretionary Wedgesmentioning

confidence: 99%

Accretion Cycles, Structural Evolution, and Thrust Activity in Accretionary Wedges With Various Décollement Configurations: Insights From Sandbox Analog Modeling

Noda,

Graveleau,

Witt

et al. 2023

JGR Solid Earth

View full text Add to dashboard Cite

The architecture (geometry, fault network, and stacking pattern of accreted thrust sheets) of accretionary wedges influences subduction zone processes. However, it remains challenging to constrain the architectural evolution in natural accretionary wedges over geological timescales. In this study, we undertook sandbox analog modeling, with quantitative analysis of the wedge geometry and digital image correlation‐based kinematics, to delineate the wedge growth history with four décollement settings (single or double and continuous or discontinuous). The results show that the wedge is formed by repeated episodic frontal accretion with a constant cycle (i.e., the accretion cycle), and the degree of coupling between the base of the wedge and subducting plate interface appears to depend on the relative strengths of the wedge and detachment. An interbedded décollement layer in the incoming sediment facilitated wedge segmentation and rearrangement of the internal fault network, which weakened the wedge strength. A combination of a detachable high‐friction patch in the basal décollement and a continuous interbedded weak layer enabled underplating of underthrusted sediment beneath the inner wedge, which involved a low‐angle, long‐lived forethrust and multiple cycles of frontal accretion on short‐lived forethrusts at the deformation front. Our findings suggest that décollement configuration is a key factor in controlling the accretion cycle, strain distribution, fault network, and wedge strength on timescales of ∼105 yr in natural accretionary systems. This result should be considered when investigating modern subduction zones.

show abstract

Section: Previous Modeling Studies Of Accretionary Wedgesmentioning

confidence: 99%

Accretion Cycles, Structural Evolution, and Thrust Activity in Accretionary Wedges With Various Décollement Configurations: Insights From Sandbox Analog Modeling

Noda,

Graveleau,

Witt

et al. 2023

JGR Solid Earth

View full text Add to dashboard Cite

show abstract

“…

The brittle deformation of the crust and sedimentary layers emerges from the accumulated granular flow of particle assemblies driven by tectonic forces (Fitz-Diaz et al, 2011;Robert et al, 2018;Roy et al, 2020;Zwaan et al, 2022). The growth and linkage of mesoscopic narrow shear discontinuities lead to the growth of macroscopic brittle discontinuities (e.g., faults) propagating along the noncohesive regions of the assemblies (Hutchings, 1993).

…”

mentioning

confidence: 99%

New Particle‐Wise Finite Element Strain Analysis for Discrete Displacement of Fold‐And‐Thrust Belt and Horst‐And‐Graben Models

An,

So,

Kim

2023

Earth and Space Science

View full text Add to dashboard Cite

The granular behaviors of shallow Earth materials are associated with brittle deformations and mass transport along the surface and fault zones. Green strain has been adopted to quantitatively analyze the fold‐and‐thrust belt and horst‐and‐graben discrete element (DE) models driven by contractional and extensional forces, respectively. Deriving Green strain from DE models is challenging because of the need for precise mapping of the discrete particle displacement onto differentiable meshes. Here, we developed a new Green strain calculation methodology, the implicit global‐finite element method (IG‐FEM), which inverts a global matrix to reflect the interconnectivity of all particles. The IG‐FEM obtains strain quantities associated with particles to prevent an information loss, for example, displacement, at particle positions. We validated the accuracy of IG‐FEM compared to the conventional strain analysis scheme for DE model, finite difference method (FDM), by estimating the relative root mean square error from analytical solutions for a given mathematical transformation. On average, the IG‐FEM and the FDM show 2.8% and 17.4% relative root mean square errors, respectively. Furthermore, the strain quantities in the fold‐and‐thrust belt and horst‐and‐graben DE models were computed. The strain patterns of the IG‐FEM are more consistent with the particle spin distribution, which is noninterpolated information of the DE models. We present the potential benefits of the IG‐FEM for assessing strain‐related values such as stress, pore pressure, and seismic velocities within brittle deformation zones. The IG‐FEM is applicable in analog models and geodetic surveys to extract strain from discrete displacement data.

show abstract

Post-Oligocene evolution of Indo-Burma wedge: Insights from deformation structures of Tripura Mizoram fold belt

Das

Bose

Dasgupta

et al. 2022

Journal of Structural Geology

View full text Add to dashboard Cite

Spatial variations of ductile strain in fold-and-thrust belts: From model to nature

Cited by 7 publications

References 132 publications

Accretion Cycles, Structural Evolution, and Thrust Activity in Accretionary Wedges With Various Décollement Configurations: Insights From Sandbox Analog Modeling

Accretion Cycles, Structural Evolution, and Thrust Activity in Accretionary Wedges With Various Décollement Configurations: Insights From Sandbox Analog Modeling

New Particle‐Wise Finite Element Strain Analysis for Discrete Displacement of Fold‐And‐Thrust Belt and Horst‐And‐Graben Models

Post-Oligocene evolution of Indo-Burma wedge: Insights from deformation structures of Tripura Mizoram fold belt

Contact Info

Product

Resources

About