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New magnetostratigraphic dating of the Palaeogene syntectonic sediments of the west-central Pyrenees: tectonostratigraphic implications

By
Belén Oliva-Urcia
Belén Oliva-Urcia
1
Dpto de Ciencias de la Tierra, Universidad de Zaragoza, c/ Pedro Cerbuna 12, 50009 Zaragoza, Spain
2
Dpto de Geología y Geoquímica, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
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Elisabet Beamud
Elisabet Beamud
3
Laboratori de Paleomagnetisme CCiTUB-CSIC, Institut de Ciències de la Terra “Jaume Almera”, c/ Solé i Sabarís s/n, 08028 Barcelona, Spain
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Miguel Garcés
Miguel Garcés
4
Departament d’Estratigrafia, Paleontologia i Geociències Marines, Universitat de Barcelona, c/Martí i Franquès s/n, 08028 Barcelona, Spain
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Concha Arenas
Concha Arenas
1
Dpto de Ciencias de la Tierra, Universidad de Zaragoza, c/ Pedro Cerbuna 12, 50009 Zaragoza, Spain
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Ruth Soto
Ruth Soto
5
Instituto Geológico y Minero de España, Unidad de Zaragoza, c/ Manuel Lasala 44, 9°B, 50006 Zaragoza, Spain
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Emilio L. Pueyo
Emilio L. Pueyo
5
Instituto Geológico y Minero de España, Unidad de Zaragoza, c/ Manuel Lasala 44, 9°B, 50006 Zaragoza, Spain
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Gonzalo Pardo
Gonzalo Pardo
1
Dpto de Ciencias de la Tierra, Universidad de Zaragoza, c/ Pedro Cerbuna 12, 50009 Zaragoza, Spain
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Published:
January 01, 2016

Abstract

New magnetostratigraphic results from a 3300 m-thick section across the syntectonic fluvial sediments of the Campodarbe Formation (Upper Eocene–Oligocene) in the Ebro foreland basin (NE Spain) are presented. The new data allow the top of the Campodarbe Formation to be correlated to Chron 7r (Chattian), younger than previously stated (C10r), therefore shifting the age of significant palaeogeographical changes in the foreland basin. The deformation in the southern front produces the cannibalization in the piggyback basin of 1300 m of sediments spanning c. 3.7 Myr. Average accumulation rates are lower in the Ebro foreland basin than in the piggyback basin and decrease from 35 to 27 cm kyr−1 by the time the San Felices thrust sheet activity decelerates (at c. 28 Myr). Shifts of accumulation rates result from accommodation space changes, which occur locally and are linked to the activity of the San Felices thrust, while the sediment supply occurs at orogenic scale (source of sediments is c. 200 km to the NE). Finally, sequence boundaries previously considered isochronous in the continental record of the Cenozoic Pyrenean basins are revealed to be 1.8–1 Myr older in the piggyback basin than in the Ebro foreland basin.

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Geological Society, London, Special Publications

Palaeomagnetism in Fold and Thrust Belts: New Perspectives

E. L. Pueyo
E. L. Pueyo
IGME, Spain
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F. Cifelli
F. Cifelli
Università degli Studi Roma TRE, Italy
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A. J. Sussman
A. J. Sussman
Los Alamos National Laboratory, USA
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B. Oliva-Urcia
B. Oliva-Urcia
Universidad Autónoma de Madrid, Spain
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Geological Society of London
Volume
425
ISBN electronic:
9781862399570
Publication date:
January 01, 2016

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