Fold structures and left-lateral ductile shear in the Gosaisho Metamorphic Belt, northeast Japan

Abstract

The Gosaisho belt forms the eastern half of an andalusite-sillimanite metamorphic terrain of the Abukuma belt in northeast Japan. Schistosity is parallel to bedding plane, and mineral lineation is subhorizontal trending NNW-SSE. The polyphase deformation history of the area is described. The microscopic and mesoscopic studies reveal the widespread development of asymmetric structures indicate left-lateral ductile shearing penetrated the Gosaisho metamorphic belt. The left-lateral ductile shearing would have been localized to the major faults. -after English summary