セッション概要
| 固体地球科学 (S) | ||||
|---|---|---|---|---|
| セッション小記号 | 地質学 (GL) |  | ||
| セッション ID | S-GL25 | |||
| タイトル | Cretaceous-Paleogene Evolution of the Circum-Pacific from Geology and/or Geodynamics | |||
| タイトル短縮名 | K-Pg Dynamics of the Circum-Pacific | |||
| 代表コンビーナ | 氏名 | ウォリス リチャード サイモン | ||
| 所属 | 東京大学 | |||
| 共同コンビーナ 1 | 氏名 | 山岡 健 | ||
| 所属 | 国立研究開発法人産業技術総合研究所 | |||
| 共同コンビーナ 2 | 氏名 | Jordan Walter Wang | ||
| 所属 | University of California, Los Angeles | |||
| 共同コンビーナ 3 | 氏名 | Jonny Wu | ||
| 所属 | University of Arizona | |||
| セッション言語 | E | |||
| スコープ | Connections between plate motions and geological features (deformation, sedimentary records, metamorphism, and volcanism) are central in tectonics. Periods of non-steady-state e.g., just after subduction starts or when a spreading ridge is being subducted, offer special insight. Understanding these intervals is key to tracing how plate tectonics has shaped Earth from its beginnings through today and into the future. The circum-Pacific region provides an excellent natural laboratory: E. Asia and the W. U.S. have well-documented geological domains arising from long-lived plate convergence, and lack continental collision, simplifying interpretations; and the Pacific Oceanic domain preserves multiple transform faults, magnetic anomalies, and hotspot tracks essential for plate reconstruction. Nevertheless, significant disagreements persist: which oceanic plates bordered Japan during the Cretaceous-Paleogene; the direction and timing of spreading; the identity and behavior of subducted slabs etc. Studies of mantle tomography, geochronology, and petrology are helping resolve such disputes. We invite contributions that address geodynamic models or geological evidence in the circum-Pacific realm. Possible topics are: tomographic imaging of subducted slabs and implications for reconstructing past plate motions; new stratigraphic, sedimentary, structural data linked to subduction geometry, ridge-subduction, etc.; metamorphic and magmatic records from both steady- and non-steady-state tectonic regime; paleomagnetic, hotspot, or magnetic anomaly data that help constrain plate kinematics; and numerical or forward geodynamic models of mantle flow, slab geometry, ridge-trench interaction, or transient tectonic phases. By bringing these together, we aim to clarify how episodic tectonic events (such as ridge subduction or subduction initiation) shape the geology of convergent margins including its thermal structure, and metamorphic and magmatic architecture. |
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| セッション形式 | 口頭およびポスターセッション | |||