14:30 〜 14:45
[MGI33-03] 主要・微量元素組成データの独立成分分析に基づくレアアース泥の起源成分の空間分布
キーワード：深海堆積物、レアアース泥、独立成分分析、化学組成、多変量解析
Deep-sea sediments highly enriched in rare-earth elements and yttrium (termed REY-rich mud) are widely distributed in the Pacific and Indian Oceans [1, 2]. Because of the huge resource potential [3], REY-rich mud is expected as a new source for the industrially critical elements (i.e., REY). Toward future exploration and development, it is important to precisely understand the origin of REY-rich mud.
Independent Component Analysis (ICA), a method of multivariate analysis, was successfully applied to a chemical composition dataset of deep-sea sediments in the Pacific and Indian Oceans to elucidate the genesis of REY-rich mud [4]. However, in the previous study, only major-elements and REY were considered. In this study, ICA was performed on a higher-dimensional dataset consisting of major- and trace-elements to characterize source components of deep-sea sediments including REY-rich mud more comprehensively. Although the overall result was generally consistent with the previous work [4], some components were newly extracted and characterized mainly by trace elements. We also visualized the spatiotemporal distributions of the independent components containing information on 44 elements. In the presentation, we will present the results of the new and comprehensive analysis.
[1] Kato et al. (2011) Nat. Geosci. 4, 535-539.
[2] Yasukawa et al. (2014) J. Asian Earth Sci. 93, 25-36.
[3] Takaya et al. (2018) Sci. Rep. 8, 5763.
[4] Yasukawa et al. (2016) Sci. Rep. 6, 29603.
Independent Component Analysis (ICA), a method of multivariate analysis, was successfully applied to a chemical composition dataset of deep-sea sediments in the Pacific and Indian Oceans to elucidate the genesis of REY-rich mud [4]. However, in the previous study, only major-elements and REY were considered. In this study, ICA was performed on a higher-dimensional dataset consisting of major- and trace-elements to characterize source components of deep-sea sediments including REY-rich mud more comprehensively. Although the overall result was generally consistent with the previous work [4], some components were newly extracted and characterized mainly by trace elements. We also visualized the spatiotemporal distributions of the independent components containing information on 44 elements. In the presentation, we will present the results of the new and comprehensive analysis.
[1] Kato et al. (2011) Nat. Geosci. 4, 535-539.
[2] Yasukawa et al. (2014) J. Asian Earth Sci. 93, 25-36.
[3] Takaya et al. (2018) Sci. Rep. 8, 5763.
[4] Yasukawa et al. (2016) Sci. Rep. 6, 29603.