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. The architecture, formation, and modification of oceanic plates arefundamental to our understanding of key geologic processes of the Earth.Geophysical surveys were conducted around a site near the Hawaiian Islands(northeastern Hawaiian North Arch region; Hawaiian North Arch hereafter),which is one of three potential sites for an International Ocean DiscoveryProgram mantle drilling proposal for the Pacific plate that was submitted in2012. The Hawaiian North Arch site is located in 78–81 Ma Cretaceous crust,which had an estimated full spreading rate of 7–8 cm yr −1 . This site fillsa major gap in our understanding of oceanic crust. Previously drilling hasbeen skewed to young or older crust (   or  u003e110  Ma)and slow-spread crust. P-wave velocity structure in the uppermost mantle of the Hawaiian North Arch shows a strong azimuthal anisotropy, whereas Moho reflections below the basement are variable: strong and continuous, weak, diffuse, or unclear. We assume that the strength of the Moho reflection is related to the aging of the oceanic plate. The Hawaiian volcanic chain (200 km to the southwest of the proposed drill site) and the nearby North Archmagmatism on the proposed Hawaiian North Arch sites might also have affectedrecognition of the Moho via deformation and/or magma intrusion into thelower crust of the uppermost mantle. This workshop report describesscientific targets for 2 km deep-ocean drilling in the Hawaiian North Archregion in order to provide information about the lower crust from unrecoveredage and spreading rate gaps from previous ocean drillings. Other scientificobjectives to be achieved by drilling cores before reaching the target depthof the project are also described in this report.

Workshop report on hard-rock drilling into mid-Cretaceous Pacific oceanic crust on the Hawaiian North Arch