| 講演要旨(和文) | | 斑岩銅鉱床や酸化鉄銅金鉱床などの非鉄金属鉱床探査ではIP法電気探査を用いることが多い．これは鉱床に賦存する黄鉄鉱や黄銅鉱などの硫化鉱物がIP効果を持つことを利用している．しかし，IP異常が観測されたところで試錐をしても，硫化鉱物が見つからないことがしばしばある．その原因の一つとして，磁鉄鉱の存在があげられる．そこで，我々は磁鉄鉱を含む岩石のSIP（複素比抵抗）を計測し，磁鉄鉱がIP効果に及ぼす影響を解明する研究を実施している．今回，釜石鉱山の鉄鉱石から磁鉄鉱を採取し，それを含む人工サンプルの複素比抵抗の測定を行った．そして，測定値にCole-Coleモデルを適用して，SIP特性に関するパラメータを求めた．黄鉄鉱を含むサンプルの複素比抵抗の計測値と比較すると，磁鉄鉱のIP効果は異なる周波数依存性をもつことや，その大きさはかなり弱いことが確認された． |
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| | 講演要旨(英文) | | Exploration of nonferrous metal ore deposits like porphyry copper and iron oxide-hosted copper-gold deposits, the IP method is used in many cases. This is because sulfide minerals such as pyrite and chalcopyrite have the IP effect. However, these sulfide minerals are not often found at the place where the IP anomalies were observed. One of the causes is existence of magnetite. Therefore we have studied the influence of magnetite to the IP effect. In this study, we measured the complex resistivity (SIP) of artificial samples consisting of magnetite particles which extracted from the iron ores of the Kamaishi mine, glass beads and KCl solutions. Then we tried to analyze the SIP parameters by Cole-Cole model. The results show that the IP effect of the artificial samples containing magnetite particles has different frequency dependency and is quite weak as compared with the IP effect of artificial samples containing pyrite particles. |
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