Mark Reagan
2004 Dives
Earth and Environmental Sciences
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Mark Reagan © 2008
IODP Expedition 352, August-September 2014
The objectives for IODP Expedition 352 were to drill through the entire volcanic sequence of the Bonin fore arc to (1) obtain a high-fidelity record of magmatic evolution during subduction initiation and early arc development, (2) test the hypothesis that fore-arc basalt lies beneath boninite and understand chemical gradients within these units and across the transition, (3) use drilling results to understand how mantle melting processes evolve during and after subduction initiation, and (4) test the hypothesis that the fore-arc lithosphere created during subduction initiation is the birthplace of suprasubduction zone (SSZ) ophiolites. We accomplished these objectives by coring 1.22 km of igneous basement and 0.46 km of overlying sediment, providing diverse, stratigraphically controlled suites of fore-arc basalts and boninite related to seafloor spreading and earliest arc development. Initial findings of the expedtion may be found in the Preliminary Report and Proceedings Volume.
The JOIDES Resolution in Yokojhama, Japan.
Preparing to drill.
Brining the core on deck.
One of the many beautiful sunrises.
A boninite hyalosclastite
Fore-arc basalt with calcite and copper-bearing vein.