磁硫鉄鉱の電気的特性と鉱床 (第1報)
1956 年 72 巻 818 号 p. 431-437
詳細
1956 年 72 巻 818 号 p. 431-437
In this report, a four probe methode of resistivity measurement is described, and the relation between electric resistivity of pyrrhotite and temperature at which they were formed is mainiy discussed.
The results obtained by the measurement are as follows:
(1) The resistivity of pyrrhotite varies from 10-3 ohm. cm to 10-1 ohm. cm as Harvey described, and is smaller than the value reported by J. J. Jakosky.
(2) The variation of the resistivity of pyrrhotite with temperature is given by the following formulaρ=A·eKα/T.
where ρ is resistivity, A, K, and a are constants and 1' is absolute temperature (K°)
(3) The frequency curve of resistivity of pyrrhotite from pyrometasomatic deposits, has two peaks. On the other hand, the pyrrhotite from so-called hydrothermal deposits has one peak.
(4) It can be said that there is some qualitative relationship between the types of frequency curves and temperature at which they were deposited. This relation, therefore, may be applied to the geothermometer, inspite of necessity of further researchs.
(5) It seems that there is no correlation between resistivity and difference of level hight.The resistivity of pyrrhotite in skarn probably of high temperature forming is higher than that of pyrrhotite of lower temperature forming.
