Clay minerals in the surface sediments of Hamana Lake, central Japan

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Authors:Abe, Yasuyuki; Wada, Hideki
Author Affiliations:Primary:
Mitsui Min. and Smelting Co., Kamioka Mine, Japan
Shizuoka Univ., Japan
Volume Title:Geoscience Reports of Shizuoka University Shizuoka Daigaku Chikyu Kagaku Kenkyu Hokoku
Source:Geoscience Reports of Shizuoka University = Shizuoka Daigaku Chikyu Kagaku Kenkyu Hokoku, Vol.13, p.147-155. Publisher: Shizuoka Daigaku Rigakubu, Chikyu Kagaku Kyoshitsu, Shizuoka, Japan. ISSN: 0388-6298
Publication Date:1987
Note:In Japanese with English summary. 18 refs.; illus. incl. geol. sketch map
Summary:Clay minerals in surface sediments and weathered rocks collected from Hamana Lake and its vicinity were identified by XRD. 1) Montmorillonite, chlorite and kaolinite decrease in amount from the N to S (28-8%, 42-22%, 22-11%, N to S, respectively). 2) Illite increases in amount from 22 to 52% southwards. It is more concentrated in the lake than in the river sediments. 3) Chlorite in the lake is less abundant than that in the river sediments except in the illite-poor Inohana Lake. Mg- and Fe-chlorite is discriminated. The former is characteristic of the N part of the lake and latter is characteristic of the S part. These results indicate that most of the clay minerals in the surface sediments of the lake are closely related to the geology of the surrounding land areas. Fe-chlorite and illite may have been brought in by ocean currents along the Enshu-nada seacoast. The concentration of chlorite and kaolinite in the central part of the lake seems to be controlled either by the bottom topography of the lake or by the size-sorting process. [A.W.H.]
Subjects:Chlorite; Chlorite group; Clay mineralogy; Clay minerals; Illite; Kaolinite; Lacustrine environment; Montmorillonite; Sedimentary petrology; Sedimentation; Sheet silicates; Silicates; X-ray data; Asia; Far East; Japan; Areal studies; Central Japan; Environment; Hamana Lake
Abstract Numbers:88M/3414
Record ID:1988013991
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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