哀牢山南段长安金矿地质特征及找矿方法研究

Geological Characteristics and Prospecting Methods of the Chang'an Gold Deposit in Southern Ailaoshan Metallogenic Belt

长安金矿位于哀牢山成矿带南段,是该成矿带上新近发现的又一大型金矿床。该区为哀牢山地体边缘地壳增生带,主要由深变质岩系组成,区内构造断裂发育,对岩浆活动和成矿作用有显著影响。本文总结了长安金矿的地质特征,并以该区的控矿断裂F6为主要研究目标,以地层岩性电性特征作为约束条件,分别展开了磁法、激电、瞬变电磁和大地电磁等综合物探手段的试验研究。研究结果表明,磁法对于该矿找矿效果不明显,瞬变电磁和大地电磁测深反演的电阻率低阻体,准确界定了控矿断裂F6的位置、倾向、断距以及深部延伸情况,通过激电异常可大致判断矿体的位置。所以在长安金矿区下一步的深部隐伏矿勘查中,结合瞬变电磁、激电、大地电磁等地球物理方法,辅以土壤化探异常进行约束,可以达到快速有效找矿之目的。

As another large gold deposit discovered recently,the Chang’ an gold deposit is located in the southern section of ailaoshan belt .The area is the edge of the crust Ailaoshan terrane accretion zone ,mainly composed of metamorphic rocks.There are many faults in the region,and they has a significant impact on the magmatism and mineralization .Based on a lot of literature and the exploration report ,the geological characteristics of Chang’ an gold deposit has been summarized in this paper.We took F6 fracture of the area as the main research goal,with lithology electrical characteristics as constraints .A lot of methods in this study contain magnetic survey,IP,TEM and EH-4.The results show that magnetic survey isn’t suitable to the Chang’ an gold deposit,but the resistivity inversion sections of TEM and EH-4 methods can reflect clearly the location,orientation,fracture width of F6 and so on.And we can determine the position of the orebody by IP anomalies.So combined with TEM,EH-4,IP and soil geochemical methods in the next work,it will be very helpful for prospecting deep concealed ore.