東北日本とロシア極東の地質の連続性：東北地方の中古生界地質からの視点


　Tectonic erosion is a process that occurs in all convergent plate boundaries, where the plate that sinks (subducting slab) scratches and drags the plate that floats (overriding plate) removing its root, and making it smaller and smaller. This process strongly occurs in NE Japan and many researchers think that it is related to hazards: mega-thrust earthquakes and tsunamis.
　 However the scales at which theses processes occur are thousands to millions of years and our only way to understand them is through the geological record. In this project we will explore how the Tohoku crust that was possibly attached to Russia, was strongly deformed.intruded and tectonically eroded during the Cretaceous and Paleogene (between 150 and 50 million years ago). The scars that subduction created were likely reactivated during the Miocene (20 million years ago) opening of the Japan Sea. Understanding the tectonic evolution of Tohoku during the Cretaceous is crucial to: (1) establish the geological links between the Japanese continent and East Asia; (2) constrain the tectonic events that deformed the Japanese Crust and caused tectonic erosion during the time frame of the study; (3) unravel how this deformation left crustal scars that could be reactivated during the Japan Sea back arc opening.


2020年度～2020年度

氏名	所属
Pastor Galan D.	FRIS
Nakamura, Norihiro	IEHE
Ganbat, Ari	Earth Sciences
Hirano, Naoto	CNEAS
Tsujimori, Tatsuki	CNEAS

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