Geodesy and Gravity/Tectonophysics
Modeling the shortening history of a fault tip fold using structural and geomorphic records of deformation
Article first published online: 10 MAR 2007
Copyright 2007 by the American Geophysical Union.
Journal of Geophysical Research: Solid Earth (1978–2012)
Volume 112, Issue B3, March 2007
How to Cite
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., , and (
- Issue published online: 10 MAR 2007
- Article first published online: 10 MAR 2007
- Manuscript Accepted: 30 OCT 2006
- Manuscript Revised: 4 OCT 2006
- Manuscript Received: 21 APR 2006
- active folding and faulting;
 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.