Rifting of the West Galicia continental margin: A review
Boillot, G.; Girardeau, J.; Kornprobst, J. (1989). Rifting of the West Galicia continental margin: A review. Bull. Soc. Géol. Fr. 5(2): 393-400
In: Bulletin de la Société Géologique de France. Société Géologique de France: Paris. ISSN 0037-9409; e-ISSN 1777-5817, meer
|  |
| Trefwoorden |
ANE, Galicia Bank
Earth structure > Earth mantle
Literature reviews
Rifting
Rocks > Igneous rocks > Ultramafic rocks > Peridotite
Topographic features > Submarine features > Continental margins
Topographic features > Submarine features > Continental margins > Passive margins
Galicia Bank [Marine Regions]
Marien/Kust |
| Auteurs | | Top |
- Boillot, G.
- Girardeau, J.
- Kornprobst, J.
|
|
|
| Abstract |
The west Galicia margin (Spain) is a typical passive margin. During the Mesozoic, the continental crust of the margin experienced several episodes of extension. The main stage was during the Berriasian-late Aptian interval (140-114 Ma). The stretching of the lithosphere resulted in (a) the thinning of the continental crust, testified by superficial extensional structures (normal faults, tilted fault blocks) and rapid subsidence, and (b) the emplacement of mantle rocks (peridotite) at the continental rift axis. The crustal thinning and the final emplacement of peridotite onto the seafloor are explained by asthenosphere diapirism succeeded by uniform, normal, simple shear of the thinned continental lithosphere. |
|
