Cooling history of nested plutons from the Variscan Tichka plutonic complex (Morocco) - Université Toulouse 3 Accéder directement au contenu
Article Dans Une Revue International Journal of Earth Sciences Année : 2017

Cooling history of nested plutons from the Variscan Tichka plutonic complex (Morocco)

Résumé

Four imbricated mafic to felsic plutons of Variscan age from Morocco have been investigated for their cooling history and geochemical interactions with surrounding continental rocks. Oxygen isotope compositions of whole rocks and minerals have been used to model the cooling rates of these kilometer-sized intrusions. By combining both the knowledge of oxygen-self diffusion data of rock-forming minerals and the determination by IR-spectroscopy of the water content of quartz, the cooling times are estimated ranging from 10⁵ to 5 × 10⁵ years in agreement with the shallow emplacement (4–6 km depth) of these intrusions into the continental crust. Such fast cooling rates could explain why after assimilation of the various country rocks, heterogeneities of both neodymium and strontium isotope ratios were still preserved. A progressive δ¹⁸O increase from the mafic to felsic terms of the plutonic suite, which does not excess 1 to 1.5‰, could be explained by the assimilation of metamorphosed pelitic and volcanic rocks that constitute the basement of the Tichka plutonic complex.
Fichier non déposé

Dates et versions

hal-01898442 , version 1 (18-10-2018)

Identifiants

Citer

Christophe Lécuyer, Dominique Gasquet, Pascal Allemand, François Martineau, Isabelle Martinez. Cooling history of nested plutons from the Variscan Tichka plutonic complex (Morocco). International Journal of Earth Sciences, 2017, 106 (8), pp.2855 - 2872. ⟨10.1007/s00531-017-1463-z⟩. ⟨hal-01898442⟩
76 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More