Magnetic Susceptibilities of Oceanic Basalts in Alternative Fields
1990 年 42 巻 5 号 p. 621-636
詳細
1990 年 42 巻 5 号 p. 621-636
Susceptibility measurements were undertaken over 32 samples of oceanic basalts in weak uniform alternative field, in order to determine the variations of both in-phase and quadrature susceptibilities with frequency in the range 1Hz-10kHz.
Multidomain grain basalts exhibit variations clearly different from single domain and pseudo-single domain ones, but in most cases a decrease of the in-phase susceptibility with frequency is verified. Except for four samples the direct proportionality between quadrature susceptibility and the first derivative of the in-phase susceptibility with frequency logarithm is also experimentally observed.
