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Integration of palaeomagnetic data, basement-cover relationships and theoretical calculations to characterize the obliquity of the Altomira–Loranca structures (central Spain)

By
M. Valcárcel
M. Valcárcel
1
Instituto Geológico y Minero de España (IGME), Departamento de Investigación en Recursos Geológicos, Des. 108, c/ La Calera, 1, 28760 Tres Cantos, Spain
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R. Soto
R. Soto
2
Instituto Geológico y Minero de España (IGME), Unidad de Zaragoza, c/ Manuel Lasala 44, 9°B, 50006 Zaragoza, Spain
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E. Beamud
E. Beamud
3
Laboratori de Paleomagnetisme (CCiTUB-ICTJA CSIC), Institut de Ciències de la Terra “Jaume Almera”, Solé i Sabarís, s/n, 08028 Barcelona, Spain
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B. Oliva-Urcia
B. Oliva-Urcia
4
Departamento de Geología y Geoquímica, Facultad de Ciencias, Universidad Autónoma de Madrid, Campus Cantoblanco, 28049 Madrid, Spain
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J. A. Muñoz
J. A. Muñoz
5
Grup Geodinàmica i Anàlisi de Conques, Universitat de Barcelona, Zona Univ, Pedralbes, 08028 Barcelona, Spain
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C. Biete
C. Biete
5
Grup Geodinàmica i Anàlisi de Conques, Universitat de Barcelona, Zona Univ, Pedralbes, 08028 Barcelona, Spain
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Published:
January 01, 2016

Abstract

The main objective of this work is to characterize the structures belonging to the Altomira Range and Loranca Basin (SW Iberian Chain, Central Spain) in terms of understanding their present-day orientation, highly oblique with respect to the NW–SE orientation of adjacent structures of the Iberian Chain. The Altomira and Loranca fold and thrust belts present a slightly curved geometry with a general north–south orientation at their central sector, and structures oriented NNE–SSW and north–south to NNW–SSE at their northern and southern sectors, respectively. Palaeomagnetic data from Middle Eocene–Lower Miocene rocks (including clays, fine sandstones and limestones) reveal the absence of vertical-axis rotations in the central sector of the studied area, where structures are oriented north–south, and up to 17° of clockwise and 21° of anticlockwise vertical-axis rotations in the northern and southern sectors, respectively. These data are supported by calculations of the theoretical vertical-axis rotations from shortening estimates and basement-cover structural relationships. This approach highlights the importance of integrating different datasets to characterize the obliquity of fold and thrust belts.

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Contents

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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