As one of the characteristics of big data analysis, the data-driven approach is applied into the numerical simulation of the ore-forming process. Based on basic physical and chemical equation and geological model, it simulates the evolution process of metallogenic system under different conditions in different stages by quantitative approach. It provides a more direct perspective for the study of the influence of various geological factors on the metallogenic system, verifying the existing metallogenic theory for a better understanding. Gushan iron deposit and Yangzhuang iron deposit are typical deposits which lies in Zhonggu ore field in Ningwu volcanic basin. Previous study shows that Yangzhuang iron deposit is a typical hydrothermal deposit of filling-contact metasomatic type, while the origin of Gushan iron deposit remains controversial: magmatic or hydrothermal origin. In order to further the comparison and comprehension of the genesis and metallogenic process of Gushan iron deposit and Yangzhuang iron deposit, in this paper, based on a comprehensive interpretation of the sections from multi-source data, the author adopts force-thermal coupling numerical simulation to carry out research into the space expansion mechanism and characteristics closely related to hydrothermal deposit. The simulation results show that there may be different genetic types in Gushan iron deposit and Yangzhuang iron deposit. With the cooling of the rock mass, obvious expansion space appears in the contact zone of rock mass and stratum within Yangzhuang iron deposit, which provides favorable conditions for the convergence of ore-forming fluid and mineral precipitation, good for the formation of hydrothermal ore deposits. In Gushan iron deposit, however, the expansion space only appears partially in the rock mass and stratum contact zone. Meanwhile, the volume strain value is small with big morphology changes, not good for large-scale fluid convergence or mineral precipitation. The results show that Gushan iron deposit may be mainly of magmatic origin and modified by a small amount of hydrothermal superposition.
Jia Cai Yuan Feng Li Xiaohui Hu Xunyu Liao Baosheng Sun Wei’an Zhang Mingming Sheng Le. Metallogenic dynamics simulation based on multi?source data constraint: A case study of the typical deposit in Zhonggu ore field in Ningwu Basin[J]. Chinese Journal of Geology, 2018, 53(4): 1327-1346.