Age of the magma chamber and its physicochemical state under Elbrus Greater Caucasus, Russia using zircon petrochronology and modeling insights - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Scientific Reports Année : 2023

Age of the magma chamber and its physicochemical state under Elbrus Greater Caucasus, Russia using zircon petrochronology and modeling insights

I. Bindeman
M. Guillong
  • Fonction : Auteur
I. Utkin
  • Fonction : Auteur
J.-F. Wotzlaw
A. Schmitt
  • Fonction : Auteur
R. Stern

Résumé

Abstract Mount Elbrus, Europe's tallest and largely glaciated volcano, is made of silicic lavas and is known for Holocene eruptions, but the size and state of its magma chamber remain poorly constrained. We report high spatial resolution U–Th–Pb zircon ages, co-registered with oxygen and hafnium isotopic values, span ~ 0.6 Ma in each lava, documenting magmatic initiation that forms the current edifice. The best-fit thermochemical modeling constrains magmatic fluxes at 1.2 km 3 /1000 year by hot (900 °C), initially zircon-undersaturated dacite into a vertically extensive magma body since ~ 0.6 Ma, whereas a volcanic episode with eruptible magma only extends over the past 0.2 Ma, matching the age of oldest lavas. Simulations explain the total magma volume of ~ 180 km 3 , temporally oscillating δ 18 O and εHf values, and a wide range of zircon age distributions in each sample. These data provide insights into the current state (~ 200 km 3 of melt in a vertically extensive system) and the potential for future activity of Elbrus calling for much-needed seismic imaging. Similar zircon records worldwide require continuous intrusive activity by magmatic accretion of silicic magmas generated at depths, and that zircon ages do not reflect eruption ages but predate them by ~ 10 3 to 10 5 years reflecting protracted dissolution–crystallization histories.
Fichier principal
Vignette du fichier
s41598-023-36793-y.pdf (3.45 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-04168570 , version 1 (21-07-2023)

Identifiants

Citer

I. Bindeman, O. Melnik, M. Guillong, I. Utkin, J.-F. Wotzlaw, et al.. Age of the magma chamber and its physicochemical state under Elbrus Greater Caucasus, Russia using zircon petrochronology and modeling insights. Scientific Reports, 2023, 13 (1), pp.9733. ⟨10.1038/s41598-023-36793-y⟩. ⟨insu-04168570⟩
59 Consultations
17 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More