MINERALOGY AND GENESIS OF HYDROTHERMAL ALUMINOUS CLAYS CONTAINING SUDOITE, TOSUDITE, AND RECTORITE IN A DRILLHOLE NEAR THE KAMIKITA KUROKO ORE DEPOSIT, NORTHERN HONSHU, JAPAN

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概要

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• Aluminous clay minerals such as pyrophyllite, dickite, sudoite, tosudite, rectorite, and sericite were found in a drillhole which was sunk near the Kamikita mine, Aomori Prefecture, Japan. These minerals display a zonal arrangement as follows : pyrophyllite (±diaspore±dickite)→sudoite (±sericite)→tosudite (±sudoite±rectorite)→rectorite (±tosudite ±sudoite) from the central part of alteration envelopes to the marginal part in the Miocene Wadagawa formation. The structure formula of sudoite was calculated as (Mg_<1.76>Al_<2.88>Fe^<2+>_<0.16>Mn_<0.01>Ti_<0.04>Na_<0.06>K_<0.01>Ca_<0.01>)_<4.93>(Si_<3.26>Al_<0.74>) O_<10>(OH)_8 from electron microprobe analysis, though it contains a small amount of expandable layer. The material has a II_b polytype and 1.507 Å of d (060) value. Tosudite intergrew intimately with sudoite. Two kinds of interstratified mica/smectites (M/S) containing 30 and 40% of expandable layers (%Sm) were identified ; they showed large intergrain chemical variation. The interlayer cation composition of rectorite is variable with respect to different depths of a drillhole and to different drillholes. K-rectorite occurs interrelatedly with M/S having 30 and 40%Sm, pyrophyllite, sericite, and sudoite. The spatial and chemical relations of these minerals indicated that the reaction series, pyrophyllite→M/S (30-40%Sm)+pyrophyllite→K-rectorite±sericite, proceeded from pyrophyllite zone to the outward as the result of increase in activities of Na, Ca, and K in hydrothermal solution. At the same time, elemental distribution reaction took place with the formation of the above minerals ; Fe, Mg, and K were selectively accomodated in sericite and Na, Ca, and Al were in rectorite.

• 日本粘土学会の論文

著者

• Utada Minoru

  The University Museum The University Of Tokyo

• Inoue Atsuyuki

  Geological Institute College Of Arts And Sciences Chiba University

関連論文

• Conversion of Trioctahedral Smectite to Interstratified Chlorite/Smectite in Pliocene Acidic Pyroclastic Sediments of the Ohyu District, Akita Prefecture, Japan
• CESIUM-AND STRONTIUM-EXCHANGE PROPERTIES OF THERMALLY ALTERED Na-MONTMORILLONITE
• INFRARED SPECTRA OF INTERSTRATIFIED ILLITE/SMECTITE FROM HYDROTHERMALLY ALTERED TUFFS (SHINZAN, JAPAN) AND DIAGENETIC BENTONITES (KINNEKULLE, SWEDEN)
• MINERALOGY AND GENESIS OF HYDROTHERMAL ALUMINOUS CLAYS CONTAINING SUDOITE, TOSUDITE, AND RECTORITE IN A DRILLHOLE NEAR THE KAMIKITA KUROKO ORE DEPOSIT, NORTHERN HONSHU, JAPAN

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