GUO Feng

Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

Abstract：The Paleo-Pacific Ocean was originated from the Panthalassa, which was a vast global ocean surrounding the Pangea Supercontinent. With the breakup of the Pangea and the closure of the Paleo-Tethyan Ocean, the Paleo-Pacific, Atlantic, Arctic and Indian Oceanic plates were in turn formed. About 190 Ma, the Pacific Plate was initially generated at the junction of the oceanic rift among the Izanagi, Farallon and Pheonix plates. Although most geologists considered a coherent genetic relationship between Meso-Cenozoic tectonic evolution of NE Asian continental margin and subduction of the Pacific Plate, there still exist some key problems. The main issues include:(1)the formation, motion trait and evolution paths of the Pacific Plate, especially the Izanagi Plate which subducted beneath the NE Asian continental margin at least since early Jurassic; (2)the beginning time of the Pacific Plate subduction; (3)the identification of subduction-related magmatism; and(4)physical conditions of subduction processes. Based on the recent research progress of the above issues, this paper synthesizes that the subduction of the Paleo-Pacific Plate(or Izanagi Plate)beneath the NE Asian continent started in the early Jurassic. The subduction zone was gradually migrated eastward and constituted anarchipelagic oceanic framework with the involvement of old microblocks or foreign massifs.

Key words：the Pacific Plate subduction NE Asian continental margin geological records

E-Mail: fengguo@gig.ac.cn  

Bulletin of Mineralogy, Petrology and Geochemistry Vol.35, No.6, 2016, page 1082-1089