Abstract
A YELLOWISH-GREY tuff, about 1 m thick, is distributed over a considerable area of the Sorachi coal field, Hokkaido, Japan1, as a member of the Noborikawa coal-bearing formation. The tuff contains a small amount of quartz and plant fragments, but is generally homogeneous. Having dispersed some of the material in water, the minus-two-micron fractions of the tuff were separated by the sedimentation method; Fig. 1 shows its electron micrograph. The X-ray powder patterns and data on the well-oriented specimens are shown in Fig. 2 and Table 1. The specimens were dried in air, heated at 150° C, 300° C, 450° C, 600° C, 750° C, for 1 h, and treated with ethylene glycol, glycerol and ammonium nitrate. The chemical compositions and differential thermal analysis curves of both natural and piperidine-treated specimens are shown in Table 2 and Fig. 3.
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References
Kobayashi, K., and Oinuma, K., J. Geol. Soc. Japan, 779, 506 (1960).
Sato, M., Nature, 208, 70 (1965).
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SATO, M., OINUMA, K. & KOBAYASHI, K. Interstratified Mineral of Illite and Montmorillonite. Nature 208, 179–180 (1965). https://doi.org/10.1038/208179b0
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DOI: https://doi.org/10.1038/208179b0
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