Multidisciplinary research on petit-spot volcanism. petrology and at sea field survey : implications for the understanding of the development of the oceanic plate

小点火山（Petit-spot）是最近在西北太平洋板块发现的早白垩世（~ 130年）的年轻（<10 Ma）小火山群，属于平原宁静区，被认为是构造不活跃的地区。本项目以了解大洋板块和岩石圈/软流圈边界为目标，对小斑进行了多学科调查和研究。本研究的目标区域为日本东北弧下俯冲洋板块，为弧的活动研究提供了重要的资料。

Petit-spot is a crap of young(<10 Ma) small volcanoes recently discovered in the NW Pacific Plate with Early Cretaceous age(～ 130), which is plain quiet area and was regarded as tectonically non-active. This project has been taken multidisciplinary survey and study on petitspot and aim to understand the oceanic plate and lithosphere/asthenosphere boundary. The result of this research provides important data to the study on the arc activities because the target area of this research is in the subducting oceanic plate beneath NE Japan arc.