Trans-crustal structural control of CO2-rich extensional magmatic systems revealed at Mount Erebus Antarctica.
Détails
Télécharger: s41467-022-30627-7.pdf (1976.91 [Ko])
Etat: Public
Version: Final published version
Licence: CC BY 4.0
Etat: Public
Version: Final published version
Licence: CC BY 4.0
ID Serval
serval:BIB_53D45D3F5795
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Trans-crustal structural control of CO2-rich extensional magmatic systems revealed at Mount Erebus Antarctica.
Périodique
Nature communications
ISSN
2041-1723 (Electronic)
ISSN-L
2041-1723
Statut éditorial
Publié
Date de publication
30/05/2022
Peer-reviewed
Oui
Volume
13
Numéro
1
Pages
2989
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: epublish
Publication Status: epublish
Résumé
Erebus volcano, Antarctica, with its persistent phonolite lava lake, is a classic example of an evolved, CO <sub>2</sub> -rich rift volcano. Seismic studies provide limited images of the magmatic system. Here we show using magnetotelluric data that a steep, melt-related conduit of low electrical resistivity originating in the upper mantle undergoes pronounced lateral re-orientation in the deep crust before reaching shallower magmatic storage and the summit lava lake. The lateral turn represents a structural fault-valve controlling episodic flow of magma and CO <sub>2</sub> vapour, which replenish and heat the high level phonolite differentiation zone. This magmatic valve lies within an inferred, east-west structural trend forming part of an accommodation zone across the southern termination of the Terror Rift, providing a dilatant magma pathway. Unlike H <sub>2</sub> O-rich subduction arc volcanoes, CO <sub>2</sub> -dominated Erebus geophysically shows continuous magmatic structure to shallow crustal depths of < 1 km, as the melt does not experience decompression-related volatile supersaturation and viscous stalling.
Pubmed
Web of science
Open Access
Oui
Création de la notice
04/07/2022 11:51
Dernière modification de la notice
15/07/2022 7:09