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doi:10.14379/iodp.sp.352.2013

Abstract 3

• Schedule for Expedition 352 3
• Introduction 4
• Background 5
• The Izu-Bonin-Mariana system 5
• Petrologic evolution 6
• Subduction initiation volcanism 6
• Boninitic and high-Mg andesitic volcanism 8
• Tectonic evolution 10
• Structure and thickness of fore-arc crust 12
• Choice of drill sites 14
• Geology of the fore arc around proposed Sites BON-1A and BON-2A 15
• Site survey data 16
• Scientific objectives 17
• Drilling and coring strategy 19
• Downhole measurements strategy 21
• Downhole logging 21
• Formation temperature and core orientation measurements 23
• Risks and contingency 23
• Time distribution 23
• Site BON-1A is deeper or shallower in the lava sequence than expected 23
• Hole stability 24
• Alternate Site 459 (Mariana fore arc) 24
• Weather conditions 24
• Sample and data sharing strategy 25
• References 27
• Site summaries 31
• Proposed Site BON-1A 31
• Site summaries (continued) 31
• Proposed Site BON-2A 31
• Site summaries (continued) 32
• Proposed Site BON-3A 32
• Site summaries (continued) 32
• Proposed Site BON-4A 32
• Site summaries (continued) 33
• Proposed Site BON-5A 33
• Site summaries (continued) 34
• Proposed Site BON-6A 34
• Site summaries (continued) 35
• Site 459 35
• Expedition scientists and scientific participants 35
• Tables
T1. Primary sites and operations plan.
T2. Alternate sites and operations plan.
Figures
F1. Map of the IBM system.x
F2. Dating results.
F3. Rare earth element patterns.
F4. V-Ti systematics.
F5. Isotopic compositions.
F6. Tectonic evolution model.
F7. Basaltic vs. boninitic character.
F8. P-wave velocity structure.
F9. Trench-parallel fore-arc seismic sections.
F10. Rock types.
F11. Diving site survey cruises.
F12. Stratigraphic section.
F13. Geological map.
F14. Sites BON-1A and BON-2A.
F15. Drilling record.
Appendix figures
FAF1. Location map.
FAF2. Site BON-1A.
FAF3. Site BON-1A.
FAF4. Site BON-2A.
FAF5. Site BON-2A.
FAF6. Site BON-3A.
FAF7. Site BON-4A.
FAF8. Site BON-5
FAF9. Site BON-6A.
FAF10. Site 459.

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