磁硫鉄鉱の磁性と鉱床について (第1報)
1955 年 71 巻 808 号 p. 629-632
詳細
1955 年 71 巻 808 号 p. 629-632
In this report, the author gives the results of measurement of magnetic susceptibilities of pyrrhotite from the following are deposits by the apparatus using alternating current;
i.e. Chichibu Mine (Saitama Pref.), Yanahara Mine (Okayama Pref.), Kawayama Mine (Yamaguchi Pref.), Komori Mine (Kyoto Pref.) and Futaba Mine (Hyogo Pref.).
The main results obtained from measurements of solid test pieces using A. C bridge method, are as follows:-
(1) The magnetic susceptibilities of pyrrhotites from these mines measured by the above method range from 18000×10-6 to 280000×10-6, and are greater than the values obtained by ordinary magnetometer method- with powdered samples.
(2) The range of the values of magnetic susceptibility of pyrrhotite is almost constant within the limitted range of frequency, irrespective of their types of deposit or.their occurence.
(3) Generally, magnetisms of the samples from the Chichibu mine and the Kawayama mine have the wide distributions from weak to strong.
(4) On the other hand, pyrrhotite from the hydrothermal deposits such as Yanahara, Komori, and Futaba mine show narrower range of magnetic susceptibility.
(5) It seems that there is no relation between the variation of magnetism and the difference of level hight except: the Yanahara mine.
(6) The values of magnetism of pyrrhotites which associate with pyrite are strong as described by Dr. Kiskyras, and those accompanied by magnetite, arsenopyrite and skarn minerals are weak.
(7) At the Chichibu and Kawayama mines, pyrrhotites near the copper and zinc rich zones have the tendency to show a special distribution of magnetic susceptibility and always have a stronger mean value.
(8) In the hydrothermal deposits, pyrrhotites which associate with chalcopyrite or sphalerite, seem to have a characteristic distribution of magnetic susceptibility.
(9) The above mentioned facts-(3)(4)(6)(7) and (8)-suggest that the strength of magnetism is related to the associated minerals, and therefore, it.can be said that magnetism of pyrrhotite relates to the types of deposit and their occurences.
