Phil E Wannamaker Virginie Maris J. A. Stodt Michael Kordy Martyn J. Unsworth Paul A. Bedrosian Erin L. Wallin Danny F. Uhlmann Yasuo Ogawa Philip R. Kyle Graham J Hill 2022 <p><span>Erebus volcano, Antarctica, with its persistent phonolite lava lake, is a classic example of an evolved, CO</span>₂<span>-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</span>₂<span>&nbsp;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</span>₂<span>O-rich subduction arc volcanoes, CO</span>₂<span>-dominated Erebus geophysically shows continuous magmatic structure to shallow crustal depths of &lt; 1 km, as the melt does not experience decompression-related volatile supersaturation and viscous stalling.</span></p> application/pdf 10.1038/s41467-022-30627-7 en Nature Trans-crustal structural control of CO2-rich extensional magmatic systems revealed at Mount Erebus Antarctica article