At the Dawn of Continents: Archean Tonalite-Trondhjemite-Granodiorite Suites - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Elements Année : 2024

At the Dawn of Continents: Archean Tonalite-Trondhjemite-Granodiorite Suites

Résumé

Archean rocks of the tonalite-trondhjemite-granodiorite (TTG) suite are dominant constituents of Earth’s earliest preserved silicic crust, while conversely rare in Phanerozoic continental crust. Their formation represents the first critical step towards the construction and preservation of continents. Formation of most TTG magmas involved partial melting of hydrous, probably silicified, mafic rocks at various depths (20–50 km, possibly up to 100 km). Many possible tectonic scenarios fit the petrological and geochemical constraints on TTG formation, whether compatible with a global plate tectonic-like regime or not. Refining such scenarios is a major challenge that requires systematically integrating the constraints on TTG formation—relying especially on accessory minerals as key petrogenetic tools—with the geological context on a regional scale.
Fichier sous embargo
Fichier sous embargo
0 4 25
Année Mois Jours
Avant la publication
mardi 3 décembre 2024
Fichier sous embargo
mardi 3 décembre 2024
Connectez-vous pour demander l'accès au fichier

Dates et versions

hal-04637214 , version 1 (05-07-2024)

Identifiants

Citer

Oscar Laurent, Martin Guitreau, Emilie Bruand, Jean-François Moyen. At the Dawn of Continents: Archean Tonalite-Trondhjemite-Granodiorite Suites. Elements, 2024, 20 (3), pp.174-179. ⟨10.2138/gselements.20.3.174⟩. ⟨hal-04637214⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More