Trans-crustal structural control of CO₂-rich extensional magmatic systems revealed at Mount Erebus Antarctica.

ABSTRACT: Erebus volcano, Antarctica, with its persistent phonolite lava lake, is a classic example of an evolved, CO₂-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 CO₂ 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 o

SUBMITTER: Hill GJ 

PROVIDER: S-EPMC9151792 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature