岡山県・野田地すべり地に産する粘土鉱物と炭質物について

概要

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Carbonaceous materials and clay minerals in the Triasic sedimentary rocks, Nariwa group, were studied in the Noda landslide area, central Chugoku, Japan by means of mainly X-ray diffractometry (XRD). The sliding surfaces were confirmed in excarvated wall of drainege wells. The specimens were obtained from the boring core as well as block sample. Carbonaceous materials were extracted from coaly mudstone. Illite, chlorite, smectite, vermiculite and kaolin minerals are recognized in the samples. Smectite, vermiculite and kaolin minerals characterize the samples collected from relatively shallow depth. The amount of smectite increases with closing to the sliding surface. It is considered that smectite, vermiculite and kaolin minerals were formed through the weathering process whereas illite which occurred commonly with chlorite were representative constituent of the host sedimentary rocks. The value of d(002) of carbonaceous materials is in the range of 3.40Å to 3.57Å. It is to be noted that the d(002) value near the sliding surface is smaller than those of the others. The fact indicates that the crystalization degree of the carbonaceous materials near the sliding surface is relatively high.
日本粘土学会の論文
1999-12-28