The parameter choice and application in correspondence analysis on gravity and magnetic anomalies

摘要

In addition to studying the correlation coefficient R and slope B of correspondence analysis method of gravity and magnetic anomalies, this paper pay more attention to the commonly neglected parameter, intercepts A, in order to get the relationship between anomalies and geological bodies. By the experiment of a three dimensional body theories model, we found: (1) the density of spacing of dots and lines did not almost influence the result of calculation. (2) The space of slip windows chosen is fit to 1.4-2 times of model radius. (3) When the gravity and magnetic anomalies are mostly correlated, it is not over 30° that the degree of the surplus magnetizing direction deviating from terrestrial magnetic field direction or the opposite side of the terrestrial magnetic field), when they are somewhat correlated, it is small or be equal to 45°. when they are weakly correlated or not correlated, it is 45°-135°. (4) For a single model research, excluding the condition that the gravity anomalies and magnetic anomalies have different source or abnormal disturbs each other, we thought intercepts was the anomaly that brought from strong surplus magnetic geological body after Poisson window filted waves. We studied the distribute scope of strong magnetic and surplus magnetic in 1:1,000,000 map of Northeast China the positions of deep and large faults and the volcano organization in 1:250,000 map of the mountain regions in Inner Mongolia according to field data processing by this method.