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岗岔金矿为甘肃甘南地区近年来新发现的中型浅成低温热液矿床。该矿床明显受断裂构造控制,其主要载金矿物为黄铁矿。本文希望通过对该矿床黄铁矿热电性的研究,可以为深部找矿有所指示。采集该矿主矿脉(Au3号脉)24件样品,挑出主矿化阶段黄铁矿共1200粒,采用BHTE-6热电系数测量仪对进行了热电性测量分析。结果表明,黄铁矿热电导型以P型为主,占总导型94.9%。根据热电性计算的矿床剥蚀度为25.5%~38.5%,平均31.1%;黄铁矿形成温度范围主要集中在200~280℃。基于以上测量结果,结合Au3号矿脉金品位纵投影等值线趋势图,预测第18-26勘探线、第2-5勘探线标高3000m以下,以及第5-23勘探线标高2800m以下具有良好的找矿前景。
Gangcha Gold Mine is a newly discovered medium-sized epithermal deposit in Gannan area, Gansu. The deposit is clearly controlled by the fault structure and its main gold-bearing mineral is pyrite. This paper hopes that the pyrite thermodynamics of the deposit can be indicated for prospecting in the deep. A total of 24 samples of main ore vein (Au3 vein) were collected, and a total of 1200 pyrites from the main mineralization stage were picked out. The thermoelectric measurements were carried out by using the BHTE-6 thermoelectric coefficient measuring instrument. The results show that the pyroelectric pyrite type is mainly P type, accounting for 94.9% of the total guided type. According to the thermoelectricity, the deposit denitrification rate is 25.5% ~ 38.5%, averagely 31.1%. The pyrite formation temperature range mainly concentrates at 200 ~ 280 ℃. Based on the above measurements, combined with the trend projection of gold projection of gold Au3, it is predicted that the 18-26 prospecting line, the 2-5 prospecting line elevation 3000m below, and the 5-23 prospecting line elevation 2800m below have good Prospecting.