skip to main content
Idioma:
Primo Advanced Search
Primo Advanced Search Query Term
Primo Advanced Search Query Term
Primo Advanced Search Query Term
Primo Advanced Search prefilters
Busca Simples

New Constraints on the Evolution of the Inner Northern Apennines by K‐Ar Dating of Late Miocene‐Early Pliocene Compression on the Island of Elba, Italy

Viola, Giulio ; Torgersen, Espen ; Mazzarini, Francesco ; Musumeci, Giovanni ; Lelij, Roelant ; Schönenberger, Jasmin ; Garofalo, Paolo Stefano

Tectonics (Washington, D.C.), 2018-09, Vol.37 (9), p.3229-3243 [Periódico revisado por pares]

Washington: Blackwell Publishing Ltd

Texto completo disponível

Citações Citado por
  • Título:
    New Constraints on the Evolution of the Inner Northern Apennines by K‐Ar Dating of Late Miocene‐Early Pliocene Compression on the Island of Elba, Italy
  • Autor: Viola, Giulio ; Torgersen, Espen ; Mazzarini, Francesco ; Musumeci, Giovanni ; Lelij, Roelant ; Schönenberger, Jasmin ; Garofalo, Paolo Stefano
  • Assuntos: Age ; brittle deformation ; Compression ; Contaminants ; Dating ; Deformation ; Evolution ; Flysch ; Frameworks ; K‐Ar fault dating ; Miocene ; Northern Apennines ; Northern Tyrrhenian Sea extension ; Oligocene ; Paleozoic ; Pliocene ; Removal ; Shear zone ; Subduction
  • É parte de: Tectonics (Washington, D.C.), 2018-09, Vol.37 (9), p.3229-3243
  • Descrição: The Northern Apennines (NA) orogenic wedge formed during Oligocene‐Miocene convergence and westward subduction of Adria beneath the European Plate. Extension ensued in the Mid‐Late Miocene in response to Adria roll‐back, causing opening of the back‐arc Northern Tyrrhenian Sea. Whether extension continues uninterrupted since the Mid‐Late Miocene or it was punctuated by short‐lived compressional events, remains, however, uncertain. We used the K‐Ar method to date a set of brittle‐ductile and brittle deformation zones from the Island of Elba to contribute to this debate. We dated the low‐angle Zuccale Fault (ZF), the Capo Norsi‐Monte Arco Thrust (CN‐MAT), and the Calanchiole Shear Zone (CSZ). The CN‐MAT and CSZ are moderately west dipping, top‐to‐the‐east thrusts in the immediate footwall of the ZF. The CSZ slipped 6.14 ± 0.64 Ma (<0.1 μm fraction) and the CN‐MAT 4.90 ± 0.27 Ma ago (<0.4 μm fraction). The ZF, although cutting the two other faults, yielded an older age of 7.58 ± 0.11 Ma (<0.1 μm fraction). The ZF gouge, however, contains an illitic detrital contaminant from the Paleozoic age flysch deformed in its hanging wall and the age thus is a maximum faulting age. Removal of ~1% of a 300‐Ma‐old contaminant brings the ZF faulting age to <4.90 Ma. Our results provide the first direct dating of brittle deformation in the Apennines, constraining Late Miocene‐Early Pliocene regional compression. They call for a refinement of current NA geodynamic models in the framework of the Northern Tyrrhenian Sea extension. Key Points We provide the first isotopic geochronological constraints on brittle deformation in the NA by illite K‐Ar dating of brittle fault rocks A combined structural‐geochronological approach constrains a Late Miocene‐Early Pliocene regional compressive stress state Results call for a refinement of geodynamic models of the North Tyrrhenian Sea extension to account for Late Miocene‐Pliocene compression
  • Editor: Washington: Blackwell Publishing Ltd
  • Idioma: Inglês
Voltar para lista de resultados
Ir para página anteriorAnterior Resultado  5 AvançarIr para próxima página

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.