Regional rotations evidenced by the paleomagnetism in the Corbieres orocline (France) | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Regional rotations evidenced by the paleomagnetism in the Corbieres orocline (France)

Type de publication:

Journal Article

Source:

Bulletin De La Societe Geologique De France, Volume 183, Ticket 5, p.409-424 (2012)

ISBN:

0037-9409

URL:

http://bsgf.geoscienceworld.org/content/183/5/409.abstract

Mots-clés:

UMR 7154 ; Paléomagnétisme

Résumé:

Eocene “syntectonic” remagnetization has been documented throughout the Corbières orocline, from the Fenouillèdes area to the Saint-Chinian arc. Analysis of the Saint-Paul de Fenouillet synclinorium shows that, although the main part of this area retained its initial E-W orientation, its eastern end was affected by a strong anti-clockwise rotation. The N-S part of the orocline is composed of blocks that are several kilometres in size, which display homogeneous anti-clockwise rotations that differ from one block to another. Paleomagnetism brought out the importance of the Vingrau structure that trends NE-SW like the fault network of the Cévennes, and which itself separates blocks affected by differing amounts of rotation. Moreover, it has been shown that the basement has also been affected by the same rotation as the overlying Corbières thrust sheet. Comparison between the paleomagnetic data and the remagnetization obtained in the Cévennes area (which dated the MVT ore deposit to the Eocene), shows that similar remagnetization also affects the Pyrenean foreland.

Notes:

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