四川张家坪子金矿床黄铁矿热电性特征及其地质意义  

Thermoelectric Characteristics and Geological Significance of Pyrite in the Zhangjiapingzi Gold Deposit,Sichuan Province

作　　者：刘蓓蓓 赖川 朱伟 庞成斌 庞振山[2,3] 吴金检 陈雨萌 石光耀 俞炳 陈辉 LIU Beibei;LAI Chuan;ZHU Wei;PANG Chengbin;PANG Zhenshan;WU Jinjian;CHEN Yumeng;SHI Guangyao;YU Bing;CHEN Hui(Sichuan Natural Resources Investment Group Panxi Co.Ltd,Xichang,Sichuan 615000;Development and Research Center,China Geological Survey,Beijing 100037;Mineral Exploration Technical Guidance Center,Ministry of Natural Resources,Beijing 100037;China Aerial Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083;Hebei GEO University,Shijiazhuang,Hebei 050031)

机构地区：[1]四川省自然资源投资集团攀西有限责任公司,四川西昌615000 [2]中国地质调查局发展研究中心,北京100037 [3]自然资源部矿产勘查技术指导中心,北京100037 [4]中国自然资源航空物探遥感中心,北京100083 [5]河北地质大学,河北石家庄050031

出　　处：《地质与勘探》2025年第2期346-358,共13页Geology and Exploration

基　　金：中地调研项目(编号:[2024]390);四川省自然资源投资集团项目(编号:[2024]190、[2024]316);中国地质调查局项目(编号:DD20230356)联合资助。

摘　　要：张家坪子金矿床是四川冕西金矿集区内一大型金矿床,经过多年的勘查工作已揭露矿体至2600m标高仍见矿。在野外地质调查的基础上,本文系统采集了多个钻孔深部的黄铁矿样品开展原位黄铁矿热电性测试。通过对不同标高黄铁矿的热电性特征进行研究,为深部找矿提供科学依据。结果显示:张家坪子黄铁矿热电系数离散度保持相对稳定但整体偏大(标准差>20);不同标高黄铁矿的热电导型以P型为主,表明该矿床仍处于浅部位置,局部(海拔2698m和2863m)存在N型可能为矿体叠加部位;黄铁矿的形成温度均较低指示其整体仍位于浅部低温层面,局部具有矿体首尾高低温相互叠加的现象;深部黄铁矿的热电导型变化梯度Y值较小,参考计算的剥蚀率(γ)得出矿床剥蚀程度仅为50%左右。综合各类热电性参数,笔者认为张家坪子金矿床的成矿潜力较大,断裂控制部位和矿体侧伏延伸方向的深部是有利的找矿空间。The Zhangjiapingzi gold deposit is a large-scale gold deposit within the Mianxi gold ore cluster in Sichuan Province.After years of exploration,the ore body has been exposed up to an elevation of 2600 meters above sea level,where mineralization is still present.Based on field geological surveys,this article systematically collected pyrite samples from multiple deep boreholes for in-situ pyrite thermoelectric testing.By studying the thermoelectric characteristics of pyrite at different elevations,a scientific basis is provided for deep mineral exploration.The results show that the thermoelectric coefficient dispersion of Zhangjiapingzi pyrite remains relatively stable but overall tends to be large(standard deviation>20).The thermal conductivity type of pyrite at different elevations is mainly P-type,indicating that the deposit is still in a shallow position,and there may be N-type deposits in some areas(at elevations of 2698 m and 2863 m)that are possible overlapping parts of the ore body.The formation temperature of pyrite is relatively low,indicating that it is still located in the shallow low-temperature layer as a whole.There is a phenomenon of overlapping high and low temperatures at the beginning and end of the ore body locally.The thermal conductivity gradient Y value of deep pyrite is relatively small,and the erosion degree of the deposit is only about 50% based on the calculated erosion rate(γ).Based on various thermoelectric parameters,we believe that the Zhangjiapingzi gold deposit has great mineralization potential,and the deep areas controlled by faults and the lateral extension direction of the ore body are favorable exploration spaces.

关 键 词：黄铁矿 热电性 成矿潜力 深部找矿 张家坪子金矿床 四川 

分 类 号：P618.51[天文地球—矿床学]