日本地球惑星科学連合2018年大会

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[JJ] Eveningポスター発表

セッション記号 B (地球生命科学) » B-CG 地球生命科学複合領域・一般

[B-CG09] 地球史解読:冥王代から現代まで

2018年5月22日(火) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:小宮 剛(東京大学大学院総合文化研究科広域科学専攻)、加藤 泰浩(東京大学大学院工学系研究科システム創成学専攻)、鈴木 勝彦(国立研究開発法人海洋研究開発機構・海底資源研究開発センター)

[BCG09-P14] Geochemical characterization of modern black mud by Independent Component Analysis

*矢野 萌生1安川 和孝1,2藤永 公一郎2,1中村 謙太郎1池原 実3加藤 泰浩1,2 (1.東京大学大学院工学系研究科システム創成学専攻、2.千葉工業大学・次世代海洋資源研究センター、3.高知大学海洋コア総合研究センター)

キーワード:酸化還元鋭敏元素、黒色泥、黒色頁岩、独立成分分析

Black shales are enriched in some kinds of redox sensitive metals as well as organic carbon and sulfides, and have been formed through the Earth history with the emergence of oxygen-depleted environment. The concentration of these metals has been attributed to an adsorption by organic matter, incorporation to or formation of sulfide minerals, or a precipitation as insoluble compounds such as oxyhydroxides.
In the modern ocean, black mud that is enriched in organic carbon and/or sulfides deposits in certain sea areas associated with an oxygen-depleted water mass, such as a silled basin or an upwelling area. These black muds likely constitute comparable counterparts of the ancient black shales. Therefore, to characterize the geochemical features of these black muds may provide a new insight into the past oceanic environmental changes.
In this study, we determined contents of major and trace elements, total organic carbon (TOC), and total sulfur (TS) of black mud and shale samples collected from a variety of geographic conditions and redox states in the water mass. In order to characterize the geochemistry of black mud and shale, we also applied Independent Component Analysis to the multi-elemental data set. We will present the analytical result and discuss its implications for the oceanic environmental changes.