Bedding-perpendicular joints striking parallel (longitudinal) and perpendicular (transverse) to both the axis of the hosting anticline and the trend of the foredeep-belt system are widely recognized in fold-and-thrust belts. Their occurrence has been commonly attributed to fold- ing-related processes, such as syn-folding outer-arc extension, although they can also be con- sistent with a pre-folding foredeep-related fracturing stage. Here we report the pre-folding fracture pattern affecting the Pietrasecca Anticline, in the central Apennines (Italy), resolved by a detailed field structural analysis. Field observations, scan-lines and interpretation of virtual outcrops were used to study the intensity, distribution and the orientations of fracture pattern along the anticline. The fracture pattern of the Pietrasecca Anticline consists of longitudinal and transverse joints, oriented approximately perpendicular to bedding, and of a pre-folding longi- tudinal pressure-solution cleavage set, which is oblique to bedding regardless of the bedding dip. Cross-cutting relationships show that joints predated the development of the pressure-solution cleavage. Furthermore, joint intensity does not relate to the structural position along the anticline. Taken together, these observations suggest that jointing occurred in a foredeep envi- ronment before the Pietrasecca Anticline growth. Our work further demonstrates that joints striking parallel and orthogonal to the main fold axis do not necessarily represent syn-folding deformation structures.

Pre-folding fracturing in a foredeep environment: insights from the Carseolani Mountains (central Apennines, Italy) / Marco Mercuri, Luca Smeraglia, Manuel Curzi, Stefano Tavani, Roberta Maffucci, Antonio Pignalosa, Andrea Billi, Eugenio Camrinati. - In: GEOLOGICAL MAGAZINE. - ISSN 0016-7568. - ELETTRONICO. - First View:(2021), pp. 1-17. [10.1017/S0016756821001291]

Pre-folding fracturing in a foredeep environment: insights from the Carseolani Mountains (central Apennines, Italy)

Manuel Curzi;
2021

Abstract

Bedding-perpendicular joints striking parallel (longitudinal) and perpendicular (transverse) to both the axis of the hosting anticline and the trend of the foredeep-belt system are widely recognized in fold-and-thrust belts. Their occurrence has been commonly attributed to fold- ing-related processes, such as syn-folding outer-arc extension, although they can also be con- sistent with a pre-folding foredeep-related fracturing stage. Here we report the pre-folding fracture pattern affecting the Pietrasecca Anticline, in the central Apennines (Italy), resolved by a detailed field structural analysis. Field observations, scan-lines and interpretation of virtual outcrops were used to study the intensity, distribution and the orientations of fracture pattern along the anticline. The fracture pattern of the Pietrasecca Anticline consists of longitudinal and transverse joints, oriented approximately perpendicular to bedding, and of a pre-folding longi- tudinal pressure-solution cleavage set, which is oblique to bedding regardless of the bedding dip. Cross-cutting relationships show that joints predated the development of the pressure-solution cleavage. Furthermore, joint intensity does not relate to the structural position along the anticline. Taken together, these observations suggest that jointing occurred in a foredeep envi- ronment before the Pietrasecca Anticline growth. Our work further demonstrates that joints striking parallel and orthogonal to the main fold axis do not necessarily represent syn-folding deformation structures.
2021
Pre-folding fracturing in a foredeep environment: insights from the Carseolani Mountains (central Apennines, Italy) / Marco Mercuri, Luca Smeraglia, Manuel Curzi, Stefano Tavani, Roberta Maffucci, Antonio Pignalosa, Andrea Billi, Eugenio Camrinati. - In: GEOLOGICAL MAGAZINE. - ISSN 0016-7568. - ELETTRONICO. - First View:(2021), pp. 1-17. [10.1017/S0016756821001291]
Marco Mercuri, Luca Smeraglia, Manuel Curzi, Stefano Tavani, Roberta Maffucci, Antonio Pignalosa, Andrea Billi, Eugenio Camrinati
File in questo prodotto:
File Dimensione Formato  
Mercuri et al. (2021) - Pietrasecca - JM.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 6.48 MB
Formato Adobe PDF
6.48 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/865573
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 3
social impact