甘肃岗岔金矿黄铁矿热电性及深部金矿化预测  

Thermoelectricity of Pyrite and Deep Perospecting of the Gangcha Gold Deposit,Gansu Province,China

作　　者：李杰[1] 申俊峰[1] 曹卫东 彭自栋 李金春 刘海明[1] 魏竹君 王佳新[1] 刘圣强[1] 王冬丽[1] 王书豪 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]惠天然矿业有限公司,兰州730000

出　　处：《矿物岩石地球化学通报》2016年第2期378-386,共9页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：惠天然矿业有限公司研究基金(2013-1)

摘　　要：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。The Gangcha gold deposit, which is a medium sized epithermal deposit, was discovered recently in the Gannan Region, Gansu Province. Its main gold-bearing mineral is pyrite. It orebodies are obviously controlled by faults. Through studying thermoelectricity of pyrite, this paper aims to provide some helpful instructions for the mineral exploration in depth of the Gangcha deposit. Total 1200 grains of the main ore stage pyrite were separated from 24 samples, which were collected form the main orebody （ Au3 orebody） of the deposit, for measuring pyrite thermoelectricity by using BHTH-6 thermoelectric coefficient analyzer. Results show that the pyrite mainly has the P-type thermal conductivity with the per- centage of 94.9%. Based on the calculation of pyrite thermoelectricity, it is believed that the erosion degree of the deposit is about 25.5% - 38.5% with an average of 31.1%. The pyrite was formed at temperatures mainly varying from 200℃ to 280℃. Based on the above testing results, with the combination of the longitudinal projection contour chart of gold grades of the Au3 orebody, it is predicted that there are good prospecting potentials in the zone between the 18th and 26th explora- tion lines, the zone between the 2th and 5th exploration lines with the elevation of 〈3000 m, and the zone between 5th and 23th exploration lines with the elevation of 〈2800 m.

关 键 词：黄铁矿 热电性 金矿化 预测 岗岔金矿 甘肃 

分 类 号：P618.51[天文地球—矿床学]