5 weeks 2 days
Expedition 351 Izu-Bonin-Mariana Arc Origins
DATES: MAY 31st - JULY 30th, 2014
PORT OF DEPARTURE/RETURN: YOKOHAMA, JAPAN
CHIEF SCIENTISTS: RICHARD ARCULUS (AUSTRALIAN NATIONAL UNIVERISTY)
OSAMU ISHIZUKA (GEOLOGICAL SURVEY OF JAPAN)
EXPEDITION PROJECT MANAGER: KARA BOGUS
EDUCATION OFFICERS: ADAM BOGUS & MIKE PROSALIK
Scientist Supporting Institution Map: https://mapsengine.google.com/map/viewer?mid=z-3dATgLw2_Q.kOBdFJkX-eZA
Expedition 351's objectives involve the study of both the sediment (oceanic crust Layer 1) and igneous basement (Layer 2) and were established to address a number of fundamental aims. The primary objectives include:
1) Determining the nature of the preexisting crust and mantle prior to subduction onset in the middle Eocene,
2) Identifying and modeling the subduction initiation process and initial arc crust formation,
3) Determining the Paleogene compositional evolution of the IBM arc, and
4) Establishing the geophysical properties of the Amami Sankaku Basin.
Expedition 351 is conceptually straightforward, targeting a single site involving penetration of a thick sedimentary section overlying oceanic crust of normal thickness. Nevertheless, the water depth (4720 m), sediment thickness (1300 m), and consequent depth into basement (~150 m) impose technical challenges. Relatively short transit times to and from the Amami Sankaku Basin will maximize the time available for scientific drilling and logging operations.
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