川西甲基卡稀有金属矿集区伟晶岩脉矿化统计特征及地质找矿意义

Statistical Characteristics of Mineralization Geological Prospecting Significance of Pegmatite Veins in Jiajika Rare Metal Ore Gathering Area in Western Sichuan Province

四川川西甲基卡地区伟晶岩脉在地表有数量多、分布广的特征。通过对498条伟晶岩脉的统计表明,含锂辉石矿化伟晶岩脉体数量超过1/5,但达到大型矿床规模以上的概率仅为0.42%左右。因此,按照传统的地表填图,发现矿化露头—探槽揭露—深部钻探验证规模的勘查流程往往易陷入周期长、勘查成本高、找矿成功率低局面。该文以甲基卡新三号超大型锂辉石伟晶岩的发现过程为实例,探讨找矿方法巧妙组合,在找矿过程中的重要性。新三号脉综合了中大比例尺的地质、物、化探等手段,并不断对新方法、新手段进行工作方法试验,建立了物探定体化探定性对勘查对象作出远景评价,再结合地表掩盖区第四系寻根溯源转石法充分确定钻探验证位置,以达到经济-有效-找矿效果好的目的,对区域上开展同类型稀有矿床找矿工作勘查部署提供参考。

The pegmatite veins in Jijika area of Sichuan province have the characteristics of large quantity and wide distribution on the surface of the earth.Through statistics of498pegmatite veins,it is indicated that the number of spodumene veins in the pegmatite body is more than1/5,but the probability of reaching the above scale is only0.42%.Therefore,according to traditional surface mapping,it is found that the exploration process of outburst exploration by mineralization outcrop-prospecting trench-deep drilling verification scale is usually easy to fall into a long cycle,high exploration cost and low success rate.In this paper,setting the discovery process of super large spodumite pegmatite of newly found No.3Jiajika super large type spodumene pegmatite as an example,the importance of the ingenious combination of prospecting methods has been studied.In the process of prospecting the newly found No.3vein,the combination of large scale geological,geophysical and geochemical exploration methods has been used,and new methods and new tools have been used to test the working methods.Prospecting process has been set up as follows:geophysical property determination-geochemical property determination-prospect evaluation.Combining with Quaternary tracing source method in the surface cover area,the position of stone drilling has been fully determined,and the economic and effective prospecting effect can be achieved.It will provide some references for prospecting the same type of rare deposit regionally.