Tectonic Deformation in Fold-Thrust Belts
Summary
Fold-thrust belts are zones of intense crustal shortening where layers of sedimentary rock are deformed by folding and thrust faulting. These belts form at convergent plate margins and within collisional orogens, accommodating strain through sequential detachment, stacking and out-of-sequence thrusting. Deformation initiates along weak horizons, promoting layer-parallel slip, and progressively evolves into complex imbricate systems in which duplexes, fault-propagation folds and back-thrusts develop. The interplay between mechanical stratigraphy, palaeogeography and regional stress orientation governs whether deformation proceeds in a thin-skinned mode, confined to sedimentary cover, or a thick-skinned mode, involving deeper basement blocks. Contemporary studies employ high-resolution seismic reflection, low-temperature thermochronology and satellite geodesy to resolve slip distributions, shortening rates and uplift patterns. Insights from these methods enhance seismic‐hazard assessment, hydrocarbon exploration and landscape evolution models, demonstrating the global significance of fold-thrust belts in both natural hazards and resource systems.
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Tectonic Deformation in Fold-Thrust Belts publication trend
The graph below shows the total number of articles in tectonic deformation in fold-thrust belts across all publications each year (not limited to Nature Index journals).
Technical terms
Fold-thrust belt: A region of layered rocks deformed by folding and low‐angle reverse faulting under compression.
Thrust fault: A reverse fault with a low dip angle along which older rocks are pushed over younger rocks.
Detachment horizon: A weak layer, often shale or evaporite, that decouples thrust sheets and localises deformation.
Thin-skinned deformation: Deformation confined to the sedimentary cover above a detachment.
Thick-skinned deformation: Involvement of basement rocks in thrusting and folding.
Fault-propagation fold: A fold that develops at the tip of a propagating thrust fault.
Duplex: A series of imbricated thrust slices bounded above and below by detachment horizons.
References
- Neotectonics of the Western Suleiman Fold Belt, Pakistan: Evidence for Bookshelf Faulting. Remote Sensing (2021).
- Active Tectonics of the Frontal Himalayas: An Example from the Manzai Ranges in the Recess Setting, Western Pakistan. Remote Sensing (2020).
- Linked thick- to thin-skinned inversion in the central Kirthar Fold Belt of Pakistan. Solid Earth (SE) (2019).
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