Punctuated growth of an accretionary prism and the onset of a seismogenic megathrust in the Nankai Trough

Gaku Kimura, Hiroaki Koge, Takeshi Tsuji

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Ocean drilling in the Nankai Trough forearc suggests a new scenario for the evolution of the Nankai subduction zone. Continuous subduction since the Late Cretaceous has been a common tectonic scenario, although the plate subduction was transferred from the Pacific Plate to the Philippine Sea Plate during the Miocene. Seismic reflection studies coupled with drilling have demonstrated that two episodes have controlled the recent evolution of the Nankai forearc: a resurgence of subduction at ~ 6 Ma after cessation since ~ 12 Ma and rapid growth of the accretionary prism since ~ 2 Ma because of the influx of large amounts of terrigenous sediments from the Japan Alps in central Japan. Both episodes were synchronous with large-scale plate reorganizations. The westward subduction of the Philippine Sea Plate initiated both in the Ryukyu and the Philippine trenches at ~ 6 Ma. Rifting in the Okinawa and Mariana troughs started at ~ 6 Ma. Compressive tectonics in northeast Japan started at ~ 3–2 Ma, and resultant mountain building with active surface erosion commenced in central Japan at ~ 2 Ma. This recent compressive tectonic phase might be due to the initiation of convergence of the Amurian Plate with the Okhotsk or North American Plate along the eastern margin of the Japan Sea. In addition to this event, the strong collision and indentation of the Izu-Bonin Arc since ~ 2.5 Ma was also enhanced in central Japan. [Figure not available: see fulltext.].

Original languageEnglish
Article number78
JournalProgress in Earth and Planetary Science
Volume5
Issue number1
DOIs
Publication statusPublished - Dec 1 2018

Fingerprint

accretionary prism
trough
subduction
Philippine Sea plate
tectonics
drilling
North American plate
indentation
Pacific plate
seismic reflection
subduction zone
rifting
trench
collision
Miocene
Cretaceous
erosion
mountain
ocean
sediment

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

Punctuated growth of an accretionary prism and the onset of a seismogenic megathrust in the Nankai Trough. / Kimura, Gaku; Koge, Hiroaki; Tsuji, Takeshi.

In: Progress in Earth and Planetary Science, Vol. 5, No. 1, 78, 01.12.2018.

Research output: Contribution to journalArticle

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