Cover thrust reactivations related to internal basement involvement during Neogene‐Quaternary evolution of the northern Apennines

Cover thrust reactivations related to internal basement involvement during Neogene‐Quaternary... Up to recently the Neogene‐Quaternary evolution of the northern Apennines (Italy) has been described by the classic model of a migrating eastward, compressive external front, with an extensional regime in the back areas connected with the Tyrrhenian basin formation. However, in the last few years, new structural data have been collected in the internal marine and continental episutural basins, and in the external exposed thrust belt. A complex structural evolution has now been reconstructed, with coeval main tectonic phases that affect both areas with stress field change. Four main tectonic phases have been identified since Late Tortonian times; these are dated as Messinian, late Pliocene, middle, and late Pleistocene. The thrust belt has a complex evolution, detected in a wide external area of the chain after the first emplacement of the main thrust sheets, with reactivations and out of sequence thrusting. These reactivation phases fit very well with the compressive phases affecting the sediments of the internal basins, suggesting a direct relationship within a single evolutive model. The increased knowledge of the deep structure of the northern Apennines through geophysical and subsurface data acquired in the last few years indicates the basement involvement at least for the internal side of the northern Apennines. This basement involvement also played an important role in the tectonic evolution of the external sector of the Apennines. In this paper a new model is proposed that integrates field data, geophysical evidence, and geodynamic constraints. The thrust reactivations and the out‐of‐sequence structures of the external area are related to internal crustal thrust activity. The deformed sediments of the Neogene‐Quaternary basins are dating the thrust activity. All the evidences point to a late Neogene rejuvenation of the tectonic evolution, but some inferences can be drawn on the development of the foredeep. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tectonics Wiley

Cover thrust reactivations related to internal basement involvement during Neogene‐Quaternary evolution of the northern Apennines

Tectonics, Volume 17 (1) – Feb 1, 1998

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Publisher
Wiley
Copyright
Copyright © 1998 by the American Geophysical Union.
ISSN
0278-7407
eISSN
1944-9194
DOI
10.1029/97TC02067
Publisher site
See Article on Publisher Site

Abstract

Up to recently the Neogene‐Quaternary evolution of the northern Apennines (Italy) has been described by the classic model of a migrating eastward, compressive external front, with an extensional regime in the back areas connected with the Tyrrhenian basin formation. However, in the last few years, new structural data have been collected in the internal marine and continental episutural basins, and in the external exposed thrust belt. A complex structural evolution has now been reconstructed, with coeval main tectonic phases that affect both areas with stress field change. Four main tectonic phases have been identified since Late Tortonian times; these are dated as Messinian, late Pliocene, middle, and late Pleistocene. The thrust belt has a complex evolution, detected in a wide external area of the chain after the first emplacement of the main thrust sheets, with reactivations and out of sequence thrusting. These reactivation phases fit very well with the compressive phases affecting the sediments of the internal basins, suggesting a direct relationship within a single evolutive model. The increased knowledge of the deep structure of the northern Apennines through geophysical and subsurface data acquired in the last few years indicates the basement involvement at least for the internal side of the northern Apennines. This basement involvement also played an important role in the tectonic evolution of the external sector of the Apennines. In this paper a new model is proposed that integrates field data, geophysical evidence, and geodynamic constraints. The thrust reactivations and the out‐of‐sequence structures of the external area are related to internal crustal thrust activity. The deformed sediments of the Neogene‐Quaternary basins are dating the thrust activity. All the evidences point to a late Neogene rejuvenation of the tectonic evolution, but some inferences can be drawn on the development of the foredeep.

Journal

TectonicsWiley

Published: Feb 1, 1998

References

  • Tectonic regime, granite emplacement and crustal structure in the inner zone of the Northern Apennines (Tuscany, Italy): A new hypothesis
    Boccaletti, Boccaletti; Gianelli, Gianelli; Sani, Sani
  • Tectonic controls on base‐level variations and depositional sequences within thrust‐top and foredeep basins: Examples from the Neogene thrust belt of central Sicily
    Butler, Butler; Grasso, Grasso
  • Structural styles, chronology rates of deformation and time‐space relationships in the Umbria‐Marche thrust system (central Apennines, Italy)
    Calamita, Calamita; Cello, Cello; Deiana, Deiana
  • Crustal extension in the Northern Apennines: The transition from compression to extension in the Alpi Apuane core complex
    Carmignani, Carmignani; Kligfield, Kligfield
  • Emplacement of foreland thrust systems
    Cello, Cello; Nur, Nur
  • A proposal for the kinematic modelling of W‐dipping subductions‐possible applications to the Tyrrhenian‐Apennines system
    Doglioni, Doglioni
  • Thrust belt development in the central Apennines (Italy): Northward polarity of thrusting and out‐of sequence deformations in the Gran Sasso chain
    Ghisetti, Ghisetti; Vezzani, Vezzani
  • The tectonic significance of Italian magmatism: An alternative view to the popular interpretation
    Lavecchia, Lavecchia; Stoppa, Stoppa
  • Extension in the Tyrrhenian Sea and shortening in the Apennines as a result of arc migration driven by sinking of the lithosphere
    Malinverno, Malinverno; Ryan, Ryan
  • Out‐of sequence thrusts
    Morley, Morley
  • The tectonic expression of slab pull at continental convergent boundaries
    Royden, Royden

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