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| | Abstract | | Bentonite is widely used for various industrial fields. Boring is mainly carried out for bentonite investigation now. It is required to develop an effective method of investigating bentonite bodies instead of boring, which requires a large amount of cost. The resistivity of bentonite is generally very low because it contains a lot of smectite which has high conductivity. It means that the electrical and electromagnetic methods are suitable for bentonite exploration. In order to confirm it, we conducted an electrical survey experiment at the Dobuyama deposit, Miyagi prefecture, Northeast Japan. The analyzed 2-D resistivity sections indicate that low-resistivity zones correspond to the bentonite bodies confirmed by surface geology and many exploration wells in this area. We also measured the resistivity with other physical and chemical properties of the bentonite samples. A good correlation was found between resistivity and methylene blue adsorption that is used as an index of the quality of bentonite. These facts indicate that electrical and electromagnetic surveys are effective for bentonite exploration and evaluation. |
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