RT Journal Article
T1 Shear zones as a result of intraplate tectonics in oceanic crust: the example of the Basal Complex of Fuerteventura (Canary Islands)
A1 Fernández Rodríguez, Carlos
A1 Casillas, R.
A1 Ahijado, A.
A1 Perello, V.
A1 Hernández Pacheco, Alfredo
AB Ductile shear zones affecting igneous rocks (pyroxenites, syenites, gabbros and carbonatites) belonging to the Basal Complex of the Island of Fuerteventura are described here. They develop typical mylonites with their cortege of structures and crystallographic fabrics. An evolution from brittle to ductile conditions has been recognized, and interpreted as being due to the ascent of alkaline magmas and related fluids and subsequent emplacement of weak rocks (carbonatites, syenites) along the shear zones. Local metamorphic changes favour the ductile behaviour via a reaction-enhanced softening mechanism. The shear zones are arranged in a nearly orthorhombic pattern. Kinematic criteria suggest an extensional tectonic scenario, with a bulk irrotational nonplane deformation. The long axis of the finite deformation ellipsoid is E-W and horizontal. The available data allow us to establish this deformation as being from the Late Oligocene to the Early Miocene. This is tentatively related to the plate-tectonics evolution and mantle anomalies in the northwestern corner of the African plate.
PB Elsevier
SN 0191-8141
YR 1997
FD 1997-01
LK https://hdl.handle.net/20.500.14352/121490
UL https://hdl.handle.net/20.500.14352/121490
LA eng
NO Fernandez, C., Casillas, R., Ahijado, A., Perello, V., & Hernandez-Pacheco, A. (1997). Shear zones as a result of intraplate tectonics in oceanic crust: the example of the Basal complex of Fuerteventura (Canary Islands). Journal of Structural Geology, 19(1), 41-57. https://doi.org/10.1016/S0191-8141(96)00074-0
NO Comisión Interministerial de Ciencia y Tecnología (España)
NO Junta de Andalucía
DS Docta Complutense
RD 20 jun 2025