[S-RD45_28PM1] 資源地質学の新展開: 地球環境変動と元素濃集

[SRD45-02] MnクラストのOs同位体層序学：その原理と応用

*野崎 達生¹、後藤 孝介²、得丸 絢加³、高谷 雄太郎⁴、鈴木 勝彦¹、常 青¹、木村 純一¹、加藤 泰浩⁴、下田 玄²、豊福 高志⁵、臼井 朗⁶、浦辺 徹郎³ (1.JAMSTEC・IFREE、2.AIST・GSJ、3.東大・理、4.東大・工、5.JAMSTEC・BIOGEOS、6.高知大・理)

キーワード：Mnクラスト, Os同位体, 地球化学, 成長ハイエタス, 古海洋環境

Sedimentation age determination by using an Os isotope stratigraphy is one of the effective dating methods for a ferromanganese crust. This dating method is applicable to the almost whole sedimentation age of a ferromanganese crust from the Late Cretaceous to present. So far, we have applied the Os isotope dating method to various ferromanganese crust samples collected from Northwestern Pacific, South Atlantic Oceans and Philippine Sea. In this presentation, we introduce the principles and applications of the Os isotope dating method, and discuss our recent results especially focusing on the growth hiatus of a ferromanganese crust.