Preprints
https://doi.org/10.5194/se-2021-82
https://doi.org/10.5194/se-2021-82

  23 Jun 2021

23 Jun 2021

Review status: this preprint is currently under review for the journal SE.

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

Olivier Lacombe1, Nicolas Beaudoin2, Guilhem Hoareau2, Aurélie Labeur2, Christophe Pecheyran3, and Jean-Paul Callot2 Olivier Lacombe et al.
  • 1Sorbonne Université, CNRS, Institut des Sciences de la Terre de Paris, Paris, France
  • 2Universite de Pau et des Pays de l’Adour, E2S UPPA, CNRS-TOTAL, LFCR, Pau, France
  • 3Universite de Pau et des Pays de l’Adour, E2S UPPA, IPREM, Pau, France

Abstract. Dating syntectonic sedimentary sequences is often seen as the unique way to constrain the initiation, kinematics and rate of folding and the sequence of deformation in the shallow crust. Beyond fold growth however, deformation mesostructures accommodate the internal shortening of pre-folding strata before, during and after strata tilting. Absolute dating of mesostructures developed during extension at fold hinge may help constrain the duration of fold growth in the absence of preserved growth strata, while dating of mesostructures related to layer-parallel shortening and late fold tightening provide a valuable access to the timing and duration of the entire folding event. We compile existing ages in the literature and provide new U-Pb ages of calcite cements from veins and faults from four folds (Apennines, Pyrenees, Rocky Mountains). Our results not only better constrain the timing of fold growth but also reveal a contraction preceding and following folding, the duration of which might be function of the tectonic style and regional sequence of deformation. This study paves the way for a better appraisal of folding lifetime and processes and of stress evolution in folded domains.

Olivier Lacombe et al.

Status: open (until 04 Aug 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on se-2021-82', Anonymous Referee #1, 11 Jul 2021 reply
  • RC2: 'Comment on se-2021-82', Anonymous Referee #2, 26 Jul 2021 reply

Olivier Lacombe et al.

Olivier Lacombe et al.

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Short summary
This paper aims at illustrating how the timing and duration of contractional deformation associated to 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.