[3oral301-07] S1. [Symposium] Cretaceous Flare-up in the Circum Pacific Region

[S1-O-5] [Invited] Linking Japan-NW Pacific plate tectonics and arc magmatism since the Cretaceous

*Jonny Wu¹, Tsung-Jui Wu², Ken Yamaoka³ (1. University of Houston, USA, 2. Institute of Earth Sciences, Academia Sinica, Taiwan, 3. Research Institute of Geology and Geoinformation, Geological survey of Japan (GSJ))

Keywords:subduction, Pacific, Izanagi, magmatism, tomography

Japan has been situated along an active subduction zone since at least the Cretaceous. Here we review the emerging use of seismic tomography to map subducted plates (i.e. slabs) now lying within the mantle under Japan to reconstruct Japan-NW Pacific plate tectonics since the Cretaceous. We build a ‘tomographic’ plate tectonic reconstruction and summarize the ages, kinematics, thermal regime, and likely identity of the plates outboard of Japan since the Cretaceous. Our plate reconstruction is compared against relatively independent arc magmatism along Japan and surrounding regions from 140 to 0 Ma. We explore possible links between arc magmatic flare-ups and lulls, magmatic ages, spatiotemporal patterns, and geochemical compositions and Japan-NW Pacific plate tectonics.