Early this morning we recovered Sentry and then awaited the first full Sentry map. And we were n’t disappointed; soon we were given an amazing map of lava flows and a faulted volcanic ridge.
Dredging continued both within, and at the margins of the axial valley. Dredge 9, across the inferred peridotite domes yielded a relatively large haul of mantle peridotite (mostly hazburgites and pyroxenites)! So this was a great success & and there were a lot of smiling scientists on board. As well as the need for the peridotites to answer the big cruise question- can mantle composition explain the Marion Rise?- the dredging of peridotite confirmed our ability to interpret the bathymetry in terms of rock type.
Dredge 10 returned basalt and glass, and dredge 11, just north of the peridotite dome is ongoing. We’ll return to multi beam surveying tomorrow as the weather worsens.