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Contrasting styles of fault reactivation in curved orogenic belts; examples from the Central Apennines (Italy)

F. Calamita, S. Satolli, V. Scisciani, P. Esestime and P. Pace
Contrasting styles of fault reactivation in curved orogenic belts; examples from the Central Apennines (Italy)
Geological Society of America Bulletin (May 2011) 123 (5-6): 1097-1111

Abstract

The geometry of the Apennine fold-and-thrust belt has been strongly influenced by the original architecture of the Adria paleomargin. In the Central Apennines, pre-thrusting normal faults (pre-orogenic Permian(?)/Triassic-Jurassic and synorogenic Neogene) were reactivated with compressional kinematics during the Neogene-Quaternary orogenesis. We present a study on the control of preexisting extensional faults on thrust tectonics in the Central Apennines. We describe positive inversion geometries of some salient fold-and-thrust structures (Setteporte, the Sabini Mountains, the Sibillini Mountains, Montagna dei Fiori, the Gran Sasso range, Maiella Mountain, and Casoli-Bomba) by integrating surface geological data and seismic-line interpretation. In these structures, different styles of fault reactivation depend on their orientation with respect to the subsequent compressional NE-SW-trending stress field. The NW-SE- and WNW-ESE-trending pre-thrusting normal faults in the backlimbs of the anticlines were displaced and passively translated in the hangingwall blocks of the thrust planes, thus exhibiting a classical shortcut geometry (shortcut anticlines). Differently, pre-orogenic normal faults in the N-S-trending anticlines were reactivated in a transpressive deformational context, as documented by the mainly dip-slip and strike-slip kinematics along the thrusts and back thrusts, respectively (reactivation anticlines). The cases studied document differences in geometry in fold-and-thrust structures related to the trend of preexisting extensional faults, showing that different reactivation geometries linked to the same inversion event can coexist at regional scale in curved fold-and-thrust belts. The proposed inversion tectonic model and the resulting geometry of the fold-and-thrust belt could possibly be applied to analogous orogenic belts.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 123
Serial Issue: 5-6
Title: Contrasting styles of fault reactivation in curved orogenic belts; examples from the Central Apennines (Italy)
Affiliation: Universita "G. d'Annunzio" di Chieti-Pescara, Dipartimento di Scienze, Pescara, Italy
Pages: 1097-1111
Published: 201105
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 75
Accession Number: 2011-044437
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2010076
Illustration Description: illus. incl. block diag., sects., geol. sketch map
N41°40'00" - N42°55'00", E13°00'00" - E14°48'00"
N41°13'60" - N42°49'60", E11°30'00" - E14°00'00"
N42°42'00" - N43°58'00", E12°07'60" - E13°56'60"
N42°19'60" - N43°40'00", E11°49'60" - E13°15'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201125
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