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Episodic growth of fold-thrust belts: Insights from Finite Element Modelling

Episodic growth of fold-thrust belts: Insights from Finite Element Modelling
Episodic growth of fold-thrust belts: Insights from Finite Element Modelling
The sequential development of a fold-thrust belt was investigated using 2D Finite Element Modelling (FEM). The new model results show that a thrust system is typically composed of three distinct regions: the thrust wedge, pre-wedge, and undeformed region. The thrust wedge involves growth that repeats episodically and cyclically. A cycle of wedge building starts as frontal accretion occurs, which is accompanied by a rapid increase in wedge width reducing the taper angle below critical. In response to this, the wedge interior (tracked here by the 50 m displacement position) rapidly propagates forwards into a region of incipient folding. The taper angle progressively increases until it obtains a constant apparent critical value (∼10°). During this period, the wedge experiences significant shortening after a new thrust initiates at the failure front, leading to a decrease in wedge width. Successive widening of the wedge and subsequent shortening and thrusting maintain a reasonably constant taper angle. The fold-thrust belt evolves cyclically, through a combination of rapid advancement of the wedge and subsequent gradual, slow wedge growth. The new model results also highlights that there is clear, although minor, deformation (0–10 m horizontal displacement) in front of the thrust wedge.
0191-8141
113-129
Yang, Xiaodong
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Peel, Frank J.
ccbb86f8-56a0-4b59-b664-e772a9c4015f
Sanderson, David J.
5653bc11-b905-4985-8c16-c655b2170ba9
Mcneill, Lisa C.
1fe6a1e0-ca1a-4b6f-8469-309d0f9de0cf
Yang, Xiaodong
0c44aab1-3c52-4e2a-925e-565a34967c57
Peel, Frank J.
ccbb86f8-56a0-4b59-b664-e772a9c4015f
Sanderson, David J.
5653bc11-b905-4985-8c16-c655b2170ba9
Mcneill, Lisa C.
1fe6a1e0-ca1a-4b6f-8469-309d0f9de0cf

Yang, Xiaodong, Peel, Frank J., Sanderson, David J. and Mcneill, Lisa C. (2017) Episodic growth of fold-thrust belts: Insights from Finite Element Modelling. Journal of Structural Geology, 102, 113-129. (doi:10.1016/j.jsg.2017.07.012).

Record type: Article

Abstract

The sequential development of a fold-thrust belt was investigated using 2D Finite Element Modelling (FEM). The new model results show that a thrust system is typically composed of three distinct regions: the thrust wedge, pre-wedge, and undeformed region. The thrust wedge involves growth that repeats episodically and cyclically. A cycle of wedge building starts as frontal accretion occurs, which is accompanied by a rapid increase in wedge width reducing the taper angle below critical. In response to this, the wedge interior (tracked here by the 50 m displacement position) rapidly propagates forwards into a region of incipient folding. The taper angle progressively increases until it obtains a constant apparent critical value (∼10°). During this period, the wedge experiences significant shortening after a new thrust initiates at the failure front, leading to a decrease in wedge width. Successive widening of the wedge and subsequent shortening and thrusting maintain a reasonably constant taper angle. The fold-thrust belt evolves cyclically, through a combination of rapid advancement of the wedge and subsequent gradual, slow wedge growth. The new model results also highlights that there is clear, although minor, deformation (0–10 m horizontal displacement) in front of the thrust wedge.

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Accepted/In Press date: 27 July 2017
Published date: 1 September 2017

Identifiers

Local EPrints ID: 413175
URI: http://eprints.soton.ac.uk/id/eprint/413175
ISSN: 0191-8141
PURE UUID: 2edfecff-4d7c-421f-9c2e-17587efe42b3
ORCID for David J. Sanderson: ORCID iD orcid.org/0000-0002-2144-3527

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Date deposited: 17 Aug 2017 16:30
Last modified: 07 Oct 2020 05:50

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