SERICITE AND INTERSTRATIFIED SERICITE-MONTMORILLONITE ASSOCIATED WITH KUROKO DEPOSITS IN THE HOKUROKU DISTRICT, JAPAN

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概要

• 論文の詳細を見る

• Six specimens of sericite minerals collected from wall-rock alteration zones of the Kuroko deposits of the Hanaoka, Kosaka and Shakanai mines, Akita Prefecture, have been examined by x-ray, chemical, infrared absorption and differential thermal analyses. The results reveal that one specimen is sericite, and the other five are interstratified minerals of sericite and montmorillonite with 5 to 40 percent montmorillonite layers. Polytypes identified in the specimens are 2M_1,1M and 1Md. Chemically the specimens are characterized by high aluminium and low magnesium and iron contents, and have a dioctahedral structure. The slight differences in octahedral composition due to substitution of aluminium by magnesium and iron can be correlated with their polytypes : the 2M_1 type has a composition close to that of muscovite, but the 1M type is phengitic. The d (060) spacings and the vibration frequencies of the IR bands at about 530 cm^<-1> also indicate these chemical variations. The differences in appearance of the endothermic peaks between 500°and 700℃ of the DTA curves seem to be related to the octahedral composition.

• 日本粘土学会の論文

著者

• Higashi Shoji

  Department Of Geology Kochi University

関連論文

• AN INTERSTRATIFIED MINERAL OF MICA-CHLORITE (SERICITESUDOITE) FROM THE MATSUMINE DEPOSIT OF THE HANAOKA MINE, AKITA PREFECTURE, JAPAN
• SERICITE AND INTERSTRATIFIED SERICITE-MONTMORILLONITE ASSOCIATED WITH KUROKO DEPOSITS IN THE HOKUROKU DISTRICT, JAPAN
• X-RAY EXAMINATION OF SERICITE MINERALS ASSOCIATED WITH THE KUROKO DEPOSITS

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