Middle Miocene swift migration of the TTT triple junction and rapid crustal growth in southwest Japan: A review
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- Gaku Kimura
- Department of Earth and Planetary Science, Graduate School of Science; University of Tokyo; Tokyo Japan
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- Yoshitaka Hashimoto
- Department of Applied Science, Faculty of Science; Kochi University; Kochi Japan
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- Yujin Kitamura
- Department of Earth and Planetary Science, Graduate School of Science; University of Tokyo; Tokyo Japan
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- Asuka Yamaguchi
- Atmosphere and Ocean Research Institute; University of Tokyo; Chiba Japan
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- Hiroaki Koge
- Department of Earth and Planetary Science, Graduate School of Science; University of Tokyo; Tokyo Japan
書誌事項
- タイトル別名
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- Middle Miocene tectonics in SW Japan
- 公開日
- 2014-06-30
- 資源種別
- journal article
- 権利情報
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- http://doi.wiley.com/10.1002/tdm_license_1.1
- DOI
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- 10.1002/2014tc003531
- 公開者
- American Geophysical Union (AGU)
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説明
We review recent progress in geological and geophysical investigation in SW Japan, Nankai Trough, and Philippine Sea Plate (PSP), and propose a hypothesis for the Miocene tectonics in SW Japan driven by middle Miocene swift migration of the TTT (trench-trench-trench) triple junction. The new hypothesis is based on the new interpretations as follows. Near-trench magmatism in the outer zone of SW Japan is ascribed to a collision of proto-Izu arc in addition to the previous model of an oceanic ridge of the Shikoku Basin and hot PSP subduction. The indentation structures at Capes Ashizuri, Muroto in Shikoku, and Shiono on the Kii Peninsula were previously explained by “kink folding” due to recent E-W compression. We alternatively suppose the collision of the active arc or topographic peaks such as seamounts inferred from geological and experimental observations. The main crustal component in SW Japan is suggested to be of igneous plutonic rocks rather than the previous interpretation of Cretaceous to Tertiary accretionary complexes. This is typically illustrated in the outer zone to the north of Capes Ashizuri, Muroto, and Shiono from geophysical observation of gravity anomalies, velocity and resistivity, together with geological estimations of caldera age and the size of its root pluton. Episodic crustal growth due to intrusion of igneous rock and subduction of the PSP may have stopped after approximately 12 Ma and restarted at approximately 6 Ma. Our emphasis for this gap is a cessation and resurgence of subduction rather than the previous interpretation, i.e., decreasing of subduction rate.
収録刊行物
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- Tectonics
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Tectonics 33 (7), 1219-1238, 2014-06-30
American Geophysical Union (AGU)
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詳細情報 詳細情報について
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- CRID
- 1360002214349470592
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- ISSN
- 02787407
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
