内蒙古迪彦钦阿木钼矿区热液矿化蚀变分带建模-基于Surpac软件

本文应用了近红外光谱分析技术(BJKF-1型便携式近红外矿物分析仪)及Gemcom Surpac三维地质建模软件;通过近红外光谱分析技术,对迪彦钦阿木矿区Ⅲ号矿带勘查钻孔中提取的岩石样品进行测试,并结合野外编录情况,将钻孔中岩石的蚀变类型主要划分为青磐岩化、泥化和绢英岩化。结合该矿区以往地质工程勘查资料,应用加拿大Gemcom Surpac三维地质建模软件,通过距离幂次反比法,将蚀变信息转化为数字参数并取代传统的品位数据,建立了矿体的蚀变块体模型,划分出了斑岩型矿床特有的蚀变分带。根据在矿区划分的蚀变分带,表明斑岩型矿化的蚀变中心位于矿区东南和西南部,推断导致成矿的斑岩侵入体很可能位于矿区东南和西南方位的深部。迪彦钦阿木矿区的工作结果表明,基于Gemcom Surpac实现的矿区三维蚀变分带建模可以很好的圈定热液矿化蚀变分带,解释并找出指向斑岩型矿化-蚀变中心的指示标志,判断矿化中心,为确认矿床类型提供了直接证据,并对进一步的勘探具有重要参考意义。

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.