Ahmad, Mohammad Irfan and Dubey, A.K. and Toscani, Giovanni and Bonini, Lorenzo and Seno, Silvio (2014) Kinematic evolution of thrusts wedge and erratic line length balancing: Insights from deformed sandbox models. International Journal of Earth Sciences, 103 (1). pp. 329-347. ISSN 1437-3254
Full text not available from this repository.Abstract
Kinematic evolution of fold-thrust structures has been investigated by analogue models that include syntectonic sedimentation. Different decollement dips and basement thicknesses produced different wedge geometries and propagating characteristics. A model with one decollement level was characterized by a closely spaced thrust system during early stages of shortening as compared to the late stages. The frequency of fault nucleation was rapid during the early stages of deformation. Conversely, the frequency of fault nucleation was low and thrust spacing was significantly wider in a model with two decollement levels. Individual faults became locked at steep dips and deformation stepped forward as a new fault nucleated in-sequence in front of the older locked structure. Once the thrust system was established up to 27 % overall shortening, an overlying bed was introduced to simulate syntectonic deformation. Model sand wedge did not grow self similarly but rather its length and height increased episodically with deformation. Restoration of deformed models show that layer parallel shortening accommodated for approximately half of the total model shortening across the multilayers. Calculated error in apparent layer shortening from the restored layers revealed a direct relation with depth of the layers in the models. The experimental results are comparable to a natural example from the Northern Apennines fold-and-thrust belts.
Item Type: | Scientific journal article, Newspaper article or Magazine article |
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Uncontrolled Keywords: | Decollement dip; Basement thickness; Multiple decollement; Syntectonic sedimentation; Northern Apennines fold-and-thrust belt |
Subjects: | Physical sciences > Geology Physical sciences > Geology > Geohazards > Seismology & tectonics |
Department/unit: | Dipartimento ambiente costruzioni e design > Istituto scienze della Terra |
Depositing User: | Silvio Seno |
Date Deposited: | 15 Sep 2014 06:10 |
Last Modified: | 07 Jun 2016 14:41 |
URI: | http://repository.supsi.ch/id/eprint/5048 |
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