Interactions of plutons and detachments: a comparison of Aegean and Tyrrhenian granitoids - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Solid Earth Année : 2021

Interactions of plutons and detachments: a comparison of Aegean and Tyrrhenian granitoids

Résumé

Abstract. Back-arc extension superimposed on mountain belts leads to distributed normal faults and shear zones interacting with magma emplacement within the crust. The composition of granitic magmas emplaced at this stage often involves a large component of crustal melting. The Miocene Aegean granitoids were emplaced in metamorphic core complexes (MCCs) below crustal-scale low-angle normal faults and ductile shear zones. Intrusion processes interact with extension and shear along detachments, from the hot magmatic flow within the pluton root zone to the colder ductile and brittle deformation below and along the detachment. A comparison of the Aegean plutons with the island of Elba MCC in the back-arc region of the Apennine subduction shows that these processes are characteristic of pluton–detachment interactions in general. We discuss a conceptual emplacement model, tested by numerical models. Mafic injections within the partially molten lower crust above the hot asthenosphere trigger the ascent within the core of the MCC of felsic magmas, controlled by the strain localization on persistent crustal-scale shear zones at the top that guide the ascent until the brittle ductile transition. Once the system definitely enters the brittle regime, the detachment and the upper crust are intruded, while new detachments migrate upward and in the direction of shearing.
Fichier principal
Vignette du fichier
se-12-1357-2021.pdf (19.93 Mo) Télécharger le fichier
Origine : Publication financée par une institution

Dates et versions

insu-03261912 , version 1 (16-06-2021)

Licence

Paternité

Identifiants

Citer

Laurent Jolivet, Laurent Arbaret, Laetitia Le Pourhiet, Florent Cheval-Garabédian, Vincent Roche, et al.. Interactions of plutons and detachments: a comparison of Aegean and Tyrrhenian granitoids. Solid Earth, 2021, 12 (6), pp.1357-1388. ⟨10.5194/se-12-1357-2021⟩. ⟨insu-03261912⟩
70 Consultations
26 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More