S3：東アジアのテクトニクス （スペシャルセッション）

[S3-02] 日本列島隠岐片麻岩類の複数変成史：古原生代変成作用と北東アジアのテクトニクス

*今山 武志¹、川端 凌市¹、加藤 丈典²、Oh Chang Whan³、堀江 憲路⁴、竹原 真美⁴ (1. 岡理大、2. 名古屋大、3. 全北大、4. 極地研)

キーワード：複数変成史、隠岐帯、古原生代変成イベント、三畳紀テクトニクス

In the Oki belt, the M1 stage occurred c. 1.85 Ga with high-T granulite-facies metamorphism which was overprinted by c. 230 Ma high-grade metamorphism (M2) and retrograde amphibolite-facies recrystallization (M3). The Oki gneisses are fragments of a Precambrian terrane rather than Paleozoic sediments derived from the terrane. The Oki belt geologically corresponds to the northern Gyeonggi Massif in South Korea due to their similar Paleoproterozoic and Triassic tectonothermal events.