A method of gravity and magnetic data correlation without the influence of remanence and its application to recognition of magmatic rocks, Guangxi

Correlation analysis of gravity and magnetic anomaly is a useful method for locating the magmatic rocks, however, it is sensitive to the remanent magnetization effects and results in artifact of opposite correlation of sources. To solve this issue, we propose a method of gravity and magnetic data correlation (GMDC) based on magnetic anomaly modulus (Ta) and gravity anomaly (Vz) or vertical gravity gradient (Vzz). This method eliminates the need for reduction to the pole of magnetic anomaly and is less sensitive to the remanent magnetization. It provides more focus on the location of magmatic sources without artifacts. The GMDC values represent the accurate correlation between density and magnetism properties of geological bodies. We apply this method to interpret the gravity and magnetic data in the Kunlunguan and Mengzhuling areas of Guangxi, China. According to the new discriminant parameters, GMDC, we identify the distribution of magmatic rocks with strong remanence, and give more information of the lithological differences.