日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

セッション記号 S (固体地球科学) » S-GC 固体地球化学

[S-GC40] Volatile Cycles in the Deep Earth - from Subduction Zone to Hot Spot

2019年5月29日(水) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:角野 浩史(東京大学大学院総合文化研究科広域科学専攻相関基礎科学系)、羽生 毅(海洋研究開発機構 地球内部物質循環研究分野)、佐野 有司(東京大学大気海洋研究所海洋地球システム研究系)、Gray E Bebout(Lehigh University)

[SGC40-P01] 大陸成長モデルの勘どころ

*是永 淳1 (1.イェール大学地球科学科)

キーワード:大陸地殻、プレートテクトニクス、化学分化

So far proposed models of continental growth exhibit bewildering diversity, but this diversity is rather superficial. By understanding how different growth models are built and what they are meant to constrain, we can gain deeper insight into the evolution of continental crust as well as the dynamics of the early Earth. There are three kinds of growth models: crust-based, mantle-based, and others. Crust-based models provide only the lower bound on net crustal growth, and mantle-based models aim at constraining net crustal growth itself. Other models are also about net crustal growth, but they are subject to greater uncertainty. In the presence of crustal recycling, crust-based models are expected to be different from mantle-based models, and more important, the difference between these two kinds of models provides important constraints on the operation of plate tectonics in the early Earth. Some popular misconceptions in the recent literature are also discussed.