Skip to Main Content
Book Chapter

Timing of magnetization and vertical-axis rotations of the Cotiella massif (Late Cretaceous, South Central Pyrenees)

By
Miguel Garcés
Miguel Garcés
1
Institut Geomodels, Departament d’Estratigrafia Paleontologia i Geociències Marines, Facultat de Geologia, Universitat de Barcelona, 08028 Barcelona, Spain
Search for other works by this author on:
Jesús García-Senz
Jesús García-Senz
2
Instituto Geológico y Minero de España, La Calera 1, 28760 Tres Cantos, Madrid, Spain
Search for other works by this author on:
Josep Antón Muñoz
Josep Antón Muñoz
3
Institut Geomodels, Departament de Geodinàmica i Geofísica, Facultat de Geologia, Universitat de Barcelona, 08028 Barcelona, Spain
Search for other works by this author on:
Berta López-Mir
Berta López-Mir
4
CASP, West Building, 181A Huntingdon Road, Cambridge CB3 0DH, UK
Search for other works by this author on:
Elisabet Beamud
Elisabet Beamud
3
Institut Geomodels, Departament de Geodinàmica i Geofísica, Facultat de Geologia, Universitat de Barcelona, 08028 Barcelona, Spain
5
Laboratori de Paleomagnetisme CCiTUB-CSIC, Institut de Ciències de La Terra ‘Jaume Almera’, 08028 Barcelona, Spain
Search for other works by this author on:
Published:
January 01, 2016

Abstract

The Cotiella thrust sheet in the South Central Pyrenees is a well-studied example of an extensional basin that formed at the northern Iberian rift margin during the Late Cretaceous, and was inverted in the Late Cretaceous and Cenozoic on top of the South Pyrenean Central Unit. A palaeomagnetic study of the thick sequence of shallow marine syn-extensional carbonates filling the Cotiella Basin reveals the presence of a widespread secondary magnetization of both normal and reversed polarities. Neither in situ nor bedding tilt correction provides a satisfactory grouping of the palaeomagnetic directions, thus suggesting syn-deformational magnetization. Best clustering of palaeomagnetic vectors is obtained after unfolding into a post-extensional pre-compressional stage, coherent with an acquisition age between Santonian and Paleocene. Strong magnetic enhancement and very distinct magnetic properties with depth suggest a link with burial diagenesis of organic matter, precipitation of iron sulphides and subsequent oxidation to SD fine-grained magnetite. The secondary magnetizations of the Cotiella record significant vertical axis rotations ranging from 14° to 52° clockwise, coherent with the scenario of the Cotiella thrust sheet transported piggy-back and bent during the emplacement of the lower Gavarnie–Sierras Exteriores thrust sheet.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Palaeomagnetism in Fold and Thrust Belts: New Perspectives

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

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal