[M-GI34] 海底マンガン鉱床の環境，開発，地球史

[MGI34-01] 海底マンガン鉱床の縞々学における課題：マンガンクラストにみられる成長構造，組成変動とその対比

*臼井 朗¹、長岡 杏奈²、浦本 豪一郎¹、村山 雅史³ (1.高知大学海洋コア総合研究センター、2.高知大学大学院理学専攻地球科学分野、3.高知大学農林海洋科学部)

キーワード：海底マンガン鉱床、マンガンクラスト、微細層序、縞々学

We attempted to apply the method of Shima-Shima-gaku (lamina stratigraphy named by prof. S. Kawakami) on the secular variations in growth structure, chemical and mineralogical properties between the growth columns of the hydrogenetic ferromanganese deposit. The critera for describing each bands or zones based on the macroscopic (=physical) properties are not always consistant with chronological correlations or may not match with mineral/chemical composition. Our microscopic characterization using optical microscope, XRF mapping, XRD, acid-leach, micro-focus X-ray CT proved a possibility of separating local and regional sources of each mineral particle or element which is closely associated the environments of eposition.