Manganese nodules from the upper Cretaceous Yubetsu Group, eastern Hokkaido

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Authors:Sakakibara, Masayuki; Niida, Kiyoaki; Togari, Kenji; Akasaka, Masahide; Takasawa, Eiichi; Goto, Yoshihiko; Yoshikawa, Masako; Kimura, Gaku; Kito, Norio; Tajika, Jun; Kato, Takayuki; Toda, Hideaki
Author Affiliations:Primary:
Ehime Univ., Dep. Earth Sci., Matsuyama, Japan
Hokkaido Univ., Japan
Shimane Univ., Japan
Okayama Univ., Japan
Kagawa Univ., Japan
Geol. Surv. Hokkaido, Japan
Geosci. Co., Japan
Hokkaido Eng. Consult., Japan
Volume Title:Chishitsugaku Zasshi Journal of the Geological Society of Japan
Source:Chishitsugaku Zasshi = Journal of the Geological Society of Japan, 95(3), p.241-244. Publisher: Nippon Chishitsugaku Gakkai, Tokyo, Japan. ISSN: 0016-7630
Publication Date:1989
Note:In Japanese. 22 refs.; illus. incl. 2 tables, sketch map
Summary:The manganese nodules have no concentric growth structure and are composed of a rhodochrosite core and birnessite mantle. The chemical composition is SiO2 7.38, TiO2 0.06, Al2O3 1.62, Fe2O 1.38, MnO 65.09, MgO 0.33, CaO 1.30, Na2O 0.10, K2O 0.74, P2O5 0.27%, Ni 19, Cu 940, Ba 3300 ppm. The authors prefer a hydrogeneous precipitation origin for these nodules in the hemipelagic ocean or continental-arc slope. [T.W.]
Subjects:Concretions; Cretaceous; Geochemistry; Manganese; Mesozoic; Metals; Secondary structures; Sedimentary petrology; Sedimentary structures; Upper Cretaceous; Asia; Far East; Hokkaido; Japan; Yubetsu Group
Abstract Numbers:95M/256
Record ID:1989061601
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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