Seismic evidence of divergent rifting and subsequent deformation in the southern Japan Sea, and a Cenozoic tectonic synthesis of the eastern Eurasian margin

Yasuto Itoh, Koji Uno, Hiroyuki Arato

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Neogene rift system configuration for the back-arc of southwest Japan, southern rim of the Japan Sea, is argued on the basis of reflection seismic interpretation. Divergent rifting and subsequent contraction provoked by an arc-arc collisional event are manifested by the formation of faulted grabens and their inverted deformation, respectively. We identified the following four Cenozoic tectonic epochs as a decomposition process of the eastern Eurasian margin based on reliable paleomagnetic data: (1) Plate margin rearrangement on a regional left-lateral fault through southwest Japan and Sikhote Alin, which constituted a continuous geologic province before the early Tertiary differential motion; (2) Early Tertiary clockwise rotation (>20°) of the east Tan-Lu block relative to the North China block; (3) Oligocene to early Miocene divergent rifting and spreading of the Japan Sea, which divided southwest Japan from the east Tan-Lu block; (4) Middle Miocene bending and back-arc inversion of southwest Japan caused by collision with the Izu-Bonin arc. According to the estimation of relative motions during these events, a paleogeographic reconstruction is presented through Cenozoic time.

Original languageEnglish
Pages (from-to)933-942
Number of pages10
JournalJournal of Asian Earth Sciences
Volume27
Issue number6
DOIs
Publication statusPublished - Oct 1 2006
Externally publishedYes

Keywords

  • Cenozoic
  • Differential rotation
  • Japan Sea
  • Paleomagnetism
  • Rifting
  • Seismic interpretation
  • Sikhote Alin
  • Southwest Japan
  • Tectonics

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

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