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Palaeomagnetism in fold and thrust belts: use with caution

By
E. L. Pueyo
E. L. Pueyo
Instituto Geológico y Minero de España, Unidad de Zaragoza c/Manuel Lasala 44, 9°, 50006 Zaragoza, Spain
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A. J. Sussman
A. J. Sussman
Earth And Environmental Sciences, MS-D452, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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B. Oliva-Urcia
B. Oliva-Urcia
Dpto. Geología y Geoquímica Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
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F. Cifelli
F. Cifelli
Dipartimento Scienze, Università degli Studi di Roma TRE, Largo San Leonardo Murialdo 1, 00146 Roma, Italy
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Published:
January 01, 2016

Abstract

The application of palaeomagnetism in fold and thrust belts is a unique way to obtain kinematic information regarding the evolution of these systems. However, since many potential problems can affect the reliability of palaeomagnetic datasets and their interpretations, such data should be used with caution. In this paper, we thoroughly review the sources of error from palaeomagnetism with a particular focus on deciphering vertical-axis rotations and the assumptions behind the method. Recent investigations have demonstrated that the age of the magnetization and syn-folding results from the fold test must also be carefully examined: factors such as internal deformation, deficient isolation of components (i.e. overlapping) or incorrect restoration procedures may produce apparent syn-folding results. In fact, the restoration procedure used to return the palaeomagnetic signal to the palaeogeographic coordinate system may itself inhibit accurate estimations of vertical-axis rotations when complex deformation histories induce different, non-coaxial, deformation axes. We recommend the auxiliary use of the inclination v. dip diagram as an efficient tool for identifying many errors. Finally, to determine accurate vertical axis rotations, the reference direction should honour standard reliability criteria and would ideally be measured within the undeformed foreland of the thrust system. In this paper, we review five decades of palaeomagnetic research in fold and thrust belts by concentrating on maximizing standard reliability criteria procedures to reduce uncertainty and increase confidence when applying palaeomagnetic data to unravel the tectonic evolution of fold and thrust belts.

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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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