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Large sheath folds in the Briançonnais of the Ligurian Alps reconstructed by analysis of minor structures and stratigraphic mapping

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  • Matteo Maino
  • Lorenzo Bonini
  • Giorgio Dallagiovanna
  • Silvio Seno

Abstract

This study presents a geometric and structural analysis of curvilinear sheath folds exposed in blueschist rocks of the Ligurian Alps. Field data are presented in a geological map of the structural synthesis with related geological sections (at the 1:10,000 scale) that illustrate the relationships and evolution of large-scale, sheath folds within metamorphic rocks. We based our analyses on the geometric parameters of more than 40 minor folds, as shape (hinge-Lm1 angle, main axial plane/S1 angle, interlimb angle and hinge curvature), asymmetry, fold hinge/stretching lineation obliquity and structural facing pattern. The summary of the whole data depicts a coherent 3D structure showing several orders of minor folds. Sense of asymmetry of minor folds and stratigraphic order has been used to reconstruct a reliable large-scale structure, and to define the sheath fold shape.

Suggested Citation

  • Matteo Maino & Lorenzo Bonini & Giorgio Dallagiovanna & Silvio Seno, 2015. "Large sheath folds in the Briançonnais of the Ligurian Alps reconstructed by analysis of minor structures and stratigraphic mapping," Journal of Maps, Taylor & Francis Journals, vol. 11(1), pages 157-167, January.
    • Handle: RePEc:taf:tjomxx:v:11:y:2015:i:1:p:157-167
    DOI: 10.1080/17445647.2014.959568
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    1. Francesco Delleani & M. Iole Spalla & Daniele Castelli & Guido Gosso, 2013. "A new petro-structural map of the Monte Mucrone metagranitoids (Sesia-Lanzo Zone, Western Alps)," Journal of Maps, Taylor & Francis Journals, vol. 9(3), pages 410-424, September.
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