小秦岭金矿田典型矿脉矿化趋势面分析与深部预测  

Trend Surface Analysis of Main Ore Veins with Applications in Mineral Resources Prediction in Xiaoqinling Gold Ore Field

作　　者：谭满堂[1] 姚书振[1] 丁振举[1] 周宗桂[1] 何谋春[1] 

机构地区：[1]中国地质大学资源学院,湖北武汉430074

出　　处：《地球科学（中国地质大学学报）》2014年第3期303-311,共9页Earth Science-Journal of China University of Geosciences

基　　金：全国危机矿山接替资源找矿项目(No.20089939)

摘　　要：小秦岭石英脉型金矿田是我国重要的金矿富集区,区内一些重要矿山已逐渐成为危机矿山,深部找矿是当务之急.运用趋势面分析法对3个典型东西向南倾矿脉的矿体厚度及品位进行处理,分析了断裂构造控矿特征及矿化富集规律.结果表明:东西向矿脉主要向南西侧伏;控矿断裂具有由南西向北东斜上左行逆冲的活动性质;多阶段矿化具有"Ⅰ阶段成脉、Ⅱ阶段金矿化、Ⅲ阶段金铅叠加"的过程;由矿体侧伏与断裂产状波状起伏联合控制的近平行等间距展布的2组结构线的交汇部位是矿化富集地段;据此指出了各矿脉深部找矿预测的主要方向.It is urgent for us to undertake deep prospecting in Xiaoqinling quartz vein type gold ore field, an important gold enrichment area in China where many famous mines are becoming crisis mines gradually. Trend surface analysis of ore veins can intuitively reflect regional and local trends of geological variables, which can be used for studying ore-controlling structure features and guiding deep prospecting. By the trend surface analysis on ore body thickness, Au and Pb grades of three typical ore veins, this paper presents the following mineralization enrichment rules and fault ore-controlling features found in the study. The main ore veins strike EW and are pitched to southwest. Ore-controlling fault thrusts from SW to NE obliquely with leftward contortion. Multistage mineralization is featured with three stages in which veins formed primarily in the first stage, Au mineralized strongly in the second stage and Au-Pb mineralization superposed in the third stage. Controlled jointly by ore- body plunging direction and fault wavelike occurrence, the intersectional parts of two structure lines distributed proximal paral- lel and equidistantly are advantageous mineralization enrichment areas, which are the promising for future deep prospecting in these ore veins.

关 键 词：趋势面分析 深部预测 石英脉型金矿 矿床 断裂 小秦岭 

分 类 号：P617[天文地球—矿床学]