Three-dimensional geological modeling and quantitative analysis for geological ore-controlling factors in Fenghuangshan copper ore field

摘要

Aiming at the issues for 3-dimensionals localization and quantitative prediction of concealed ore body in the deep and margin parts of the Fenghuangshan ore field in Tongling, Anhui, a quantitative analysis method for geological ore-controlling factors is proposed. Firstly, based on the analysis of metallogenic conditions and integrated geological exploration data, the three-dimensional shapes of the ore-controlling geological bodies such as strata, structures, magmatic bodies and ore bodies were inferred and simulated in three-dimensional visualization environment by dint of three-dimensional geological modeling technology. Secondly, from the three-dimensional grid geological models, some 3-dimensional shapes of some complex ore-controlling geological bodies with overlay surfaces, were analyzed by morphological operations and extracted as the geological ore-controlling factors. Lastly, the field models of various geological ore-controlling factors, including the magmatic body and its surface relief, the contact zone, the strata, the faults and so on, were set up to describe quantitatively geological ore-controlling effects. By analyzing quantitatively the associated relationship between the geological ore-controlling factors and the mineralization distribution, It is proved that the extracted geological ore-controlling factors have more powerful controlling effects on mineralization spatial distribution. The method is feasible to gain the quantitative geological ore-controlling indexes for indicating the ore-formation advantage degree.