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Book Chapter

Migration of Ancient Arc-Trench Systems

Hakuyu Okada
Hakuyu Okada
Kagoshima University, Kagoshima, Japan
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January 01, 1974


In Hokkaido, two asynchronous pairs of Jurassic to earliest Tertiary arc-trench systems are recognized. Tlie trench belt of the older pair occupies a part of the Jurassic to Cretaceous Yezo Geosyncline, where the Kamuikotan metamorphic rock belt may represent a west-dipping subduction zone. The trench belt of the younger pair is represented by the latest Cretaceous to earliest Tertiary Small Kuril Geosyncline (new name). In both geosynclines, the trench sediments are characterized by the following fourfold succession, in ascending order: (1) radiolarian chert or siliceous shale and pillow lavas, (2) flysch, (3) shallow-marine muddy sediment, and (4) molasselike sequences. Farther to the south of the Small Kuril Geosyncline, the modern Kuril Trench has been developed. These consecutive developments of arc-trench systems present a good example of oceanward migration patterns of the systems.

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SEPM Special Publication

Modern and Ancient Geosynclinal Sedimentation

R. H. Dott, Jr.
R. H. Dott, Jr.
University of Wisconsin, Madison
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Robert H. Shaver
Robert H. Shaver
Indiana University, Bloomington
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Society of Economic Paleontologists and Mineralogists
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Publication date:
January 01, 1974




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