R7: Petrology, Mineralogy and Economic geology (Joint session with SRG)

[R7-01] The penetration of the upper oceanic crust off-Hawaii - Toward under-standing of the style of extension and the architecture of oceanic crust

*Susumu Umino¹, Tomoaki Morishita¹, Jun-Ichi Kimura², Mikiya Yamashita³, Michael Garcia⁴, Frieder Klein⁵, Nobukazu Seama⁶, Shigeaki Ono², Natsue Abe², Katsuyoshi Michibayashi⁷, Masako Tominaga⁵ (1. Kanazawa Univ., 2. JAMSTEC, 3. AIST, 4. Univ. Hawaii, 5. WHOI, 6. KURCIS, 7. Nagoya Univ.)

Keywords:IODP, ocean drilling, North Arch off Hawaii, upper crustal architecture, giant landslides

We propose to drill a complete upper crustal section and into the uppermost gabbros in 80 Ma crust spread at 8 cm/a on the North Arch off-Hawaii. The drilling is specifically designed to understand the relationships between the style of crustal extension and the architecture of the upper crust, and the physical and chemical evolution of oceanic lithosphere with special reference to the Moho diversity and the North Arch, which provide crucial information on the Earth’s evolution.