OKINO, Kyoko

Atmosphere and Ocean Research Institute

Office: AORI-713
TEL: +81-4-7136-6131
FAX: +81-4-7136-6148

Research Field

Marine Geophysics, Ocean Floor Tectonics

Current Research

The basic question of my research is how the plate kinematics, mantle upwelling and melting variations result in large differences in the world mid-ocean ridges. To tackle this problem, I studied the seafloor spreading process at mid-ocean ridges and backarc basins using morphology, gravity and magnetic anomalies and sonar images based on field surveys. Currently I focus on the following three topics: 1. melt-starved spreading and development of detachment fault at mid-ocean ridges, 2, Long oceanic transform along which temporal variation of oceanic crust formation is recorded, 3. hot-spot ridge interaction as a melt-rich system, 4. Evolution of the backarc basins. I also study how the composition and structure of oceanic crust/lithosphere control the variety of hydrothermalism at mid-ocean ridges. To approach these themes, I develop the high-resolution seafloor mapping techniques, such as high-resolution sonar and submersible attached magnetometer. more details :〜okino/

Representative Publications

1. Okino, K., K. Nakamura, H. Sato, Tectonic background of four hydrothermal fields along the Central Indian Ridge, Subseafloor Biosphere Linked to Global Hydrothermal Systems; TAIGA Concept, edited by J. Ishibashi et al., Springer, 2015
2. Okino, K., K. Matsuda, D. Christie, Y. Nogi, and K. Koizumi, Development of oceanic detachment and asymmetric spreading at the Australian-Antarctic Discordane, Geochemi. Geophys. geosyst., 5(12), Q12012, doi:10.1029/2004GC000793, 2004.
3. Okino, K., D. Curewitz, M. Asada, K. Tamaki, P. Vogt, and K. Crane, Segmentation of the Knipovich Ridge implication for focused magmatism and effect of ridge obliquity at an ultraslow spreading system, Earth Planet. Sci. Lett., 202, 275-288,2002.