焦家金成矿带三维成矿条件分析与成矿预测

Metallogenic Prediction and Analysis of the Three-dimensional Metallogenic Conditions of Jiaojia Gold Ore Belt

分析了山东焦家金成矿带大中型典型矿床地质特征和控矿地质条件,建立了该地区的找矿地质模型,总结了区内控矿地质条件和找矿标志在深部的变化规律,采用Surpac软件对岩体、已知矿体、物化探异常等进行了三维实体建模。在此基础上,首先采用立方体预测模型法对三维实体模型进行空间分割,并根据建立的找矿地质模型,将所确定的预测参数作为属性值赋给每一个立方体单元块,建立数字找矿模型;然后对研究区地质、地球物理、地球化学的13个预测变量进行三维成矿有利条件分析与提取,采用三维信息法计算各预测变量的信息量,寻找成矿有利组合的空间部位,并结合研究区内实际地质情况、已有见矿工程分布等因素圈定了6处找矿靶区;最后采用体积估计法计算得到该6处找矿靶区的总资源量为382.482 8 t。上述研究成果对于区内的找矿工作具有一定的参考价值。

The geological prospecting model of Jiaojia gold ore belt is established by analyzing the geological characteris- tics and ore-controlling conditions of the large and medium-sized typical ore deposits in Jiaojia gold ore belt, Shandong prov- ince. The geological ore-controlling conditions and the change rule of prospecting criteria in the deep are summarized. The three-dimensional geological solid model of rock mass, the known orebody and geophysical anomalies are obtained by utilizing Surpac software. Based on the above analysis results, firstly, the three-dimensional solid model is divided into small cubes by a- dopting the cubic predicting model. Combing with the geological prospecting model, the identified prediction parameters are re- garded as attribute values assigned to each cube of the three-dimensional solid model so as to establish the digital prospecting model; then,the three-dimensional metallogenic favorable conditions are analyzed and extracted from the 13 prediction varia- bles of geological, geophysical and geochemical of the research area, and the information quantity values of the 13 prediction variables are calculated by using the three-dimensional information method to look for the space parts of the mineralization fa- vorable combinations. Besides that,6 prospecting target areas are delineated on the basis of the information such as actual geo- logical conditions, distributions of the existing mine engineering and so on ; finally, the total mineral resources of 6 prospecting target areas are obtained as 382. 482 8 t by adopting the volume estimating method. The above analysis results can provide some reference for the prospecting work in this research area.