岩矿标本退磁改正误差的探讨

Discussion on the Error of Demagnetization Correction of Rock and Ore Samples

对岩矿标本退磁改正误差进行了分析讨论,指出岩矿标本的NΚ'近于1时,退磁改正系数很大且不稳定,视磁化率(Κ')的误差和退磁系数(N)的误差,经退磁改正后会引起更大的磁化率(Κ)误差和剩余磁化强度(Jr)误差,甚至可能得出磁化率(Κ)和剩余磁化强度(Jr)为负值的错误结果,导致磁参数难以用于磁测资料解释推断。提出应尽可能采集规整的岩矿标本并提高磁参数测定精度,减小视磁化率的误差和退磁系数的误差,以确保获得可用于磁测资料解释推断的磁参数。

In this paper, errors of demagnetization correction of rock and ore samples are analyzed and discussed. It is clear that when the NK＇ of rock and ore samples around 1, demagnetization correction coefficient is very high and unsteady, after demagnetization correction, error of the apparent magnetic susceptibility （K＇） and the demagnetizing factor（N） will cause higher errors of magnetic susceptibility （K） and remanent magnetization （Jr）, and might even induce a wrong result with negative magnetic susceptibility （K） and remanent magnetization （Jr）. The magnetic parameters are difficult to interpret magnetic survey data. Standardized rock and ore samples should be used for improving precision of the magnetic parameters measurement, reducing the errors of apparent magnetic susceptibility and demagnetizing factor, and interpreting magnetic survey data.