Magma Supply in Back-arc Spreading Centre Segment E2, East Scotia Ridge

Segment E2 is situated in the back-arc East Scotia Ridge. The segment is unusual in that it has an axial topographic high underlain by a seismically imaged melt lens. The axis of the segment, which is 70 km long, was sampled at ~2 km spacing. There is strong correlation between compositions and bathymetry, and there is no evidence that lateral flow of magmas along dykes within the segment was more than 25 km. Magmas are more evolved towards the summit, indicating that magma fractionation took place within the imaged melt lens. Na