open access

https://hdl.handle.net/2115/38514

Forearc Tectonics and Tentative Plate-tectonic Synthesis for Jurassic - Cretaceous Hokkaido, Japan

英語

Unconformity

2004

Graduate School of Science, Hokkaido University

Neo-Science of Natural History: Integration of Geoscience and Biodiversity Studies : Proceedings of International Symposium on "Dawn of a New Natural History - Integration of Geoscience and Biodiversity Studies" March 5-6, 2004, Sapporo

109-119

International Symposium on "Dawn of a New Natural History - Integration of Geoscience and Biodiversity Studies". 5-6 March 2004. Sapporo, Japan.

Plate-tectonic synthesis for Middle Jurassic - Late Cretaceous Hokkaido, Japan is tentatively but first presented. Middle Jurassic eastward subduction beneath the margin of Asian Continent produced accretionary body of characteristic continental clastic supply. Jump of trench to the east in the earliest Cretaceous age caused a wide forearc basin and volcanic-arc activity. During early Late Cretaceous, uplift and emergence of high-pressure type metamorphosed part of accretionary body occurred inside of the forearc, and formed local unconformity in the forearc sequence. This process shows growth and evolution of the eastern margin of Asian Continent before the Neogene opening of the Japan Sea. Geologic information given from forearc units is important for understanding the tectonics of arc-trench system.

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