A Model for Alteration Zoning of Hydrothermal Mineralization Based on Surpac Software for the Diyanqinamu Mo Mine District,Inner Mongolia

This work is based on application of the near-infrared spectroscopy (NIR) analysis technology (Portable near-infrared mineral analyzer of BJKF-1 type) and the Gemcom Surpac three-dimensional modeling software.We have measured the hydrothermal alteration samples collected from the boreholes of the No.3 belt in the Diyanqinamu area,Inner Mongolia by using the NIR analysis technology.Integrated with field records,we divided the alteration types into propylitization,argillic alteration and sericitic alteration.Combined with previous geological survey data,and utilizing the Canadian Geomon Surpac three-dimensional modeling software,alteration information is tranformed into digital parameters which replace the traditional grade data by the adopting genetic algorithm method.Then we set up the altered orebody block model,and delineated rock alteration zones that characterize porphyry deposits.The alteration zonation in the Diyanqinamu area indicates that the centre of the porphyry mineralization lies in the southeast and southwest of the mine field.It is inferred that the porphyry intrusions could be found beneath the centre of the porphyry internalization.The results in the Diyanqinamu area show that the Gemcom Surpac three-dimensional modeling software can effectively determine the hydrothermal alteration zones and establish mineralization models,interpret and locate the indicators directing to the centre of the porphyry mineralization-alteration,and estimate the mineralization center.This study may provide direct evidence for verifying deposit type and has guidance significance to the further exploration.