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Palaeomagnetism and magnetic fabrics of the Late Palaeozoic volcanism in the Castejón-Laspaúles basin (Central Pyrenees). Implications for palaeoflow directions and basin configuration

Published online by Cambridge University Press:  07 November 2013

ESTHER IZQUIERDO-LLAVALL ,
ANTONIO CASAS-SAINZ ,
BELÉN OLIVA-URCIA  and
ROBERT SCHOLGER
ESTHER IZQUIERDO-LLAVALL*
Affiliation:
Departamento de Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain
ANTONIO CASAS-SAINZ
Affiliation:
Departamento de Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain
BELÉN OLIVA-URCIA
Affiliation:
Geo-environmental Processes and Global Change, IPE-CSIC, Zaragoza, Spain
ROBERT SCHOLGER
Affiliation:
Chair of Applied Geophysics, University of Leoben, Leoben, Austria
*
†Author for correspondence: estheriz@unizar.es
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Abstract

The Castejón-Laspaúles basin is one of the South Pyrenean basins of Late Variscan age that were strongly inverted during the Alpine compression (Late Cretaceous–Tertiary). It is mainly composed by Stephanian pyroclastic and volcanic deposits that reach a maximum thickness of ~ 500 m, and are overlain by Permian and Triassic sedimentary units. A palaeomagnetic and magnetic fabrics (AMS) study was carried out in the Stephanian units, where the general absence of flow markers at the outcrop scale and the Alpine inversional structure prevent the straightforward reconstruction of the original volcanic and basinal configuration. Magnetic fabric data are not overprinted by Alpine internal deformation and can be interpreted in terms of primary volcanic and pyroclastic fabrics. The obtained directions coincide in the different sampled units, suggesting a constant source area during the development of the basin, and show the dominance of N–S-trending K1 axes that are interpreted to be parallel to flow directions. Palaeomagnetic data indicate the presence of a pre-folding palaeomagnetic component that is rotated clockwise by an average of +37° (±32°) with regards to the Stephanian reference. This rotation probably took place during Alpine thrusting since it is also registered by the overlying Triassic deposits. The whole dataset is interpreted in terms of basin development under sinistral transtension with two main fault sets: deep-rooted E–W-striking faults, probably responsible for magmatic emissions, and shallow-rooted, listric faults of N–S orientation.

Keywords

magnetic fabricspalaeomagnetismvolcanismStephanianPyrenees

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Type
Original Articles
Information
Geological Magazine , Volume 151 , Issue 5 , September 2014 , pp. 777 - 797
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Copyright © Cambridge University Press 2013 

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