Joint system in the Osumi granodiorite batholith, southern Kyushu, Southwest Japan

This study analyses the joint system of Middle Miocene Osumi granodiorite batholith in southern Kyushu, Southwest Japan. The analysis included 916 joints at 96 localities covering northern, middle, and domains exposed area batholith. Two major sets steep striking NNW ENE a minor set gentle are recognized northern middle domains. further NS EW with domain. Previous paleomagnetic studies indicate counterclockwise rotation microplates southeast Kyushu after 2 Ma. When orientations restored according to angles (45° for northern-middle 30° domain), strikes largely oriented NNE WNW.