Daëron, Mathieu and Avouac, Jean-Philippe and Charreau, Julien (2007) Modeling the shortening history of a fault tip fold using structural and geomorphic records of deformation. Journal of Geophysical Research B, 112 (B3). Art. No. B03S13 . ISSN 0148-0227 http://resolver.caltech.edu/CaltechAUTHORS:20101115-123245277
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We present a methodology to derive the growth history of a fault tip fold above a basal detachment. Our approach is based on modeling the stratigraphic and geomorphic records of deformation, as well as the finite structure of the fold constrained from seismic profiles. We parameterize the spatial deformation pattern using a simple formulation of the displacement field derived from sandbox experiments. Assuming a stationary spatial pattern of deformation, we simulate the gradual warping and uplift of stratigraphic and geomorphic markers, which provides an estimate of the cumulative amounts of shortening they have recorded. This approach allows modeling of isolated terraces or growth strata. We apply this method to the study of two fault tip folds in the Tien Shan, the Yakeng and Anjihai anticlines, documenting their deformation history over the past 6–7 Myr. We show that the modern shortening rates can be estimated from the width of the fold topography provided that the sedimentation rate is known, yielding respective rates of 2.15 and 1.12 mm/yr across Yakeng and Anjihai, consistent with the deformation recorded by fluvial and alluvial terraces. This study demonstrates that the shortening rates across both folds accelerated significantly since the onset of folding. It also illustrates the usefulness of a simple geometric folding model and highlights the importance of considering local interactions between tectonic deformation, sedimentation, and erosion.
|Additional Information:||© 2007 Geophysical Union. Received 21 April 2006; revised 4 October 2006; accepted 30 October 2006; published 10 March 2007. We are most grateful to John Suppe, Aurélia Hubert-Ferrari, and Ramon Gonzalez-Mieres for sharing their results with us ahead of publication. We are also indebted to John Suppe, Martine Simoes, and Stéphane Dominguez for fruitful discussion. M. Daëron is grateful for the support of the Ecole Doctorale de l’École Polytechnique, which supported this work through a ‘‘Jeune Post-Doc’’ grant in 2005. This study was partly funded by the Gordon and Betty More Foundation. This is Caltech Tectonics Observatory contribution 48.|
|Group:||Caltech Tectonics Observatory, Caltech Tectonics Observatory. Indo-Asian Collision Zone|
|Subject Keywords:||active folding and faulting; geomorphology|
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|Official Citation:||Daëron, M., J.-P. Avouac, and J. Charreau (2007), Modeling the shortening history of a fault tip fold using structural and geomorphic records of deformation, J. Geophys. Res., 112, B03S13, doi:10.1029/2006JB004460|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||15 Nov 2010 22:49|
|Last Modified:||26 Dec 2012 12:38|
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