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Foreland-directed gravitational collapse along curved thrust fronts; insights from a minor thrust-related shear zone in the Umbria-Marche Belt, central-northern Italy

Paolo Pace, Valeria Pasqui, Enrico Tavarnelli and Fernando Calamita
Foreland-directed gravitational collapse along curved thrust fronts; insights from a minor thrust-related shear zone in the Umbria-Marche Belt, central-northern Italy
Geological Magazine (March 2017) 154 (2): 381-392

Abstract

Gravitational collapse occurs during the mature evolution of orogenic belts, but its signature is difficult to discriminate in macroscopic structures from that of pre-, syn- or late-/post-orogenic extension, so reliable mesoscopic examples are particularly useful. A composite fabric developed along a lateral thrust ramp in the Apennines reveals mesoscopic normal faults that truncate the thrust surface, overprint the S-fabric and merge downwards in a foreland-directed splay, leaving the thrust footwall undeformed. These relationships indicate syn-/late-thrusting extension, which we interpret as induced by hanging-wall gravitational collapse. Our study provides critical constraints for reconstructing the kinematic evolution of collapsing thrust fronts.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 154
Serial Issue: 2
Title: Foreland-directed gravitational collapse along curved thrust fronts; insights from a minor thrust-related shear zone in the Umbria-Marche Belt, central-northern Italy
Affiliation: Universita degli Studi G. D'Annunzio, Dipartimento di Ingegneria e Geologia, Chieti-Pescara, Italy
Pages: 381-392
Published: 201703
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 78
Accession Number: 2017-039509
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N42°31'60" - N42°45'00", E12°49'60" - E12°55'60"
Secondary Affiliation: Universita degli Studi di Siena, ITA, Italy
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201722
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