The analysis of sanshan island based on constrained magnetization vector inversion.

Gold ores are important strategic key mineral resource in China. The Sanshan Island area produces gold ores, in which the magmatic activity becomes the heat source for the activation of gold-bearing fluids, and the widely developed fracture structure provides the channel and spatial structure for gold transport and enrichment. Therefore, it is an important direction to utilize the inversion method to portray the distribution of fractures and intrusive rocks. We propose Power-type structural self-constrained magnetization vector (PTSS-MV) inversion method to utilize the inversion result's own structure for self-constraint, thus obtaining high-resolution inversion results with clearer boundaries. Under the different buried depth models, the calculation result of the volume ratio formula is increased by 15%, which is used to reflect the accuracy of the inversion. The method proposed in this paper was applied in Sanshan Island area to delineate the distribution of fractures and analyze the relationship between fractures and mineralization. Based on the results of magnetic vector inversion, we circled multiple high magnetization intensity bodies, and found that the high magnetic objects are endowed near the fracture, and the high magnetic body edges and tectonic intersections are favorable sites for deep gold mineralization. The method proposed in this paper can still obtain relatively accurate results under the influence of remanent magnetization, and finally we have identified four favorable areas for mineralization, which would provide favorable information for the next step of revealing the distribution of minerals.