Linking rifted margin crustal shape with the timing and volume of magmatism - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Terra Nova Année : 2023

Linking rifted margin crustal shape with the timing and volume of magmatism

Résumé

Determining the volume and timing of magmatism during rifting and breakup is challenging due to the similar density and seismic velocity of inherited continental crust, magmatic additions and serpentinized mantle; and the difficulty of dating magmatic additions. Here rules of thumb to estimate these are proposed based on the characteristics of the top basement and Moho on seismically imaged margins. A simple kinematic model is used to generate first-order crustal shapes of margins as a function of magma volume and timing of emplacement, which are successfully compared to a representative number of rifted margins. It appears that 'magma-rich margins' require melt emplacement in advance of crustal thinning but not necessarily enhanced melt volume, while margins with exhumed mantle require a delay in melt emplacement but not necessarily a low magmatic volume. An alternative classification for the magmapoor/magma-rich dichotomy is proposed to better represent the crustal shape variability of rifted margins.

Domaines

Tectonique
Fichier principal
Vignette du fichier
Terra Nova - 2023 - Chenin - Linking rifted margin crustal shape with the timing and volume of magmatism.pdf (4.94 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

insu-04240758 , version 1 (13-10-2023)

Identifiants

Citer

Pauline Chenin, Simon Tomasi, Nick Kusznir, Gianreto Manatschal. Linking rifted margin crustal shape with the timing and volume of magmatism. Terra Nova, 2023, ⟨10.1111/ter.12690⟩. ⟨insu-04240758⟩
16 Consultations
6 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More