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|Stretching and contraction of extensional basins with pre-rift salt: a numerical modelling approach
|Martínez Granado, Pablo
Ruh, Jonas B.
Muñoz, J. A.
Tectonique du sel
|We present a series of 2D thermo-mechanical numerical experiments of thick-skinned crustal extension including a pre-rift salt horizon and subsequent thin-, thick-skinned, or mixed styles of convergence accompanied by surface processes. Extension localization along steep basement faults produces half-graben structures and leads to variations in the original distribution of pre-rift salt. Thick-skinned extension rate and salt rheology control hanging wall accommodation space as well as the locus and timing of minibasin grounding. Upon shortening, extension-related basement steps hinder forward propagation of evolving shallow thrust systems; conversely, if full basin inversion takes place along every individual fault, the regional salt layer is placed back to its pre-extensional configuration, constituting a regionally continuous décollement. Continued shortening and basement involvement deform the shallow fold-thrust structures and locally breaches the shallow décollement. We aim at obtaining a series of structural, stratigraphic and kinematic templates of fold-and-thrust belts involving rift basins with an intervening pre-rift salt horizon. Numerical results are compared to natural cases of salt-related inversion tectonics to better understand their structural evolution.
|Reproducció del document publicat a: https://doi.org/10.3389/feart.2021.648937
|It is part of:
|Frontiers in Earth Science, 2021, vol. 9, num. 648937
|Appears in Collections:
|Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
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