Articles | Volume 12, issue 10
https://doi.org/10.5194/se-12-2145-2021
https://doi.org/10.5194/se-12-2145-2021
Research article
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30 Sep 2021
Research article | Highlight paper |  | 30 Sep 2021

Dating folding beyond folding, from layer-parallel shortening to fold tightening, using mesostructures: lessons from the Apennines, Pyrenees, and Rocky Mountains

Olivier Lacombe, Nicolas E. Beaudoin, Guilhem Hoareau, Aurélie Labeur, Christophe Pecheyran, and Jean-Paul Callot

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Cited articles

Ahmadhadi, F., Daniel, J. M., Azzizadeh, M., and Lacombe, O.: Evidence for pre-folding vein development in the Oligo-Miocene Asmari Formation in the Central Zagros Fold Belt, Iran, Tectonics, 27, TC1016, https://doi.org/10.1029/2006TC001978, 2008. 
Amrouch, K., Lacombe, O., Bellahsen, N., Daniel, J. M., and Callot, J. P.: Stress and strain patterns, kinematics and deformation mechanisms in a basement-cored anticline: Sheep Mountain Anticline, Wyoming, Tectonics, 29, TC1005, https://doi.org/10.1029/2009TC002525, 2010a. 
Amrouch, K., Robion, P., Callot, J. P., Lacombe, O., Daniel, J. M., Bellahsen, N., and Faure, J. L.: Constraints on deformation mechanisms during folding provided by rock physical properties: a case study at Sheep Mountain anticline (Wyoming, USA), Geophys. J. Int., 182, 1105–1123, 2010b. 
Amrouch, K., Beaudoin, N., Lacombe, O., Bellahsen, N., and Daniel, J. M.: Paleostress magnitudes in folded sedimentary rocks, Geophys. Res. Lett., 38, L17301, https://doi.org/10.1029/2011GL048649, 2011. 
Anastasio, D., Kodama, K., and Parés, J.: Episodic deformation rates recovered from growth strata, Pyrenees, Search and Discovery, AAPG Datapages/Search and Discovery Article #90291, AAPG Annual Convention and Exhibition, Houston, Texas, 2–5 April 2017, 30553, 2017. 
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Short summary
This paper aims to illustrate how the timing and duration of contractional deformation associated with folding in orogenic forelands can be constrained by the dating of brittle mesostructures observed in folded strata. The study combines new and already published absolute ages of fractures to provide, for the first time, an educated discussion about the factors controlling the duration of the sequence of deformation encompassing layer-parallel shortening, fold growth, and late fold tightening.
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