Imagerie sismique de la zone de collision hercynienne dans le Sud-Est du Massif armoricain (projet Armor 2/programme Géofrance 3D) |
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| Authors: | Adnand Bitri Michel Ballèvre Jean-Pierre Brun Jean Chantraine Denis Gapais Paul Guennoc Charles Gumiaux Catherine Truffert |
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| Institution: | 1. BRGM, CDG/MA, 3, av. Claude-Guillemin, BP 6009, Orléans cedex 2, France;2. Géosciences Rennes, UMR, 6118 CNRS, campus de Beaulieu, 35042 Rennes cedex, France |
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| Abstract: | The structure of the Hercynian collision zone in the southeast of the Armorican Massif is illustrated by a 70-km long deep seismic profile acquired in September 2000. The profile images a previously unknown south-dipping thrust that brought the Champtoceaux Domain on top of the Central Armorican Domain during Carboniferous times. Dextral strike-slip motions along the South Armorican Shear Zone, which is downward cut by the thrust zone, are partly coeval with northward thrusting. A major discontinuity, hidden by the thrust front, is also imaged in the lower crust between the Champtoceaux area and the Central Armorican Domain. These new data lead to a structural and kinematic re-interpretation of this part of the Hercynian collision zone. To cite this article: A. Bitri et al., C. R. Geoscience 335 (2003). |
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| Keywords: | collision hercynienne sismique profonde Massif armoricain France Hercynian collision deep seismic Armorican Massif France |
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