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投稿时间：2023-05-01 修订日期：2023-08-24 网络发布日期：2023-11-01
中文摘要:石家金矿床位于胶东中部蓬莱-栖霞成矿带北段，是一个赋存于中生代花岗岩中受构造带控制的石英脉型金矿床。由于多年开采，矿区浅部资源已近于枯竭，亟需向深部拓展找矿空间。黄铁矿是石家金矿床最常见的金属矿物，也是最重要的载金矿物，其标型特征对深部找矿预测具有十分重要的意义。文章对采自石家金矿床326号矿脉不同海拔标高主成矿阶段黄铁矿的热电性与晶胞参数进行了分析，结果表明：在-595~-165 m标高内，石家金矿床黄铁矿的热电导型以P型为主，占比约97.5%，表明目前揭露的矿体处于矿化系统的上部或顶部；热电系数（α）变化于-288.3~304.9 μV/℃，较大的离散范围表明矿体垂向延伸较大；黄铁矿热电系数离散度为8%~68%，较低的离散度指示黄铁矿形成于较为稳定的条件之下，并且矿化程度较好；利用热电系数计算黄铁矿的形成温度集中于210~250℃，指示石家金矿床属于中温矿床；根据热电系数计算的矿体剥蚀率（γ）为25.5%~34.0%，表明矿体未遭受大规模的剥蚀，向下仍有较大延伸。黄铁矿晶胞参数a0介于0.5418~0.5422 nm，略大于理论值（0.54176 nm）。结合黄铁矿热电导型与前人研究，认为晶胞参数的变大可能与As类质同象替代S有关。综合分析认为，石家金矿床在-600 m以下的深部仍具有良好的找矿前景。
Abstract:The Shijia gold deposit is located in the north of the Penglai-Qixia gold belt in the central part of Jiaodong Peninsula. It is a quartz-vein type gold deposit that occurs in the Mesozoic granite and is controlled by structural zones. Due to years of mining, the shallow resources in the mining area have been almost mined out, and there is an urgent need to expand the exploration space to the deeper part. Pyrite is the most common metal mineral and the most important gold-bearing mineral in the Shijia gold deposit. Its typomorphic characteristics are of great significance to the deep prospecting and prediction of the Shijia gold deposit. This paper systematically analyzes the thermoelectricity of the main-ore stage pyrite from No. 326 orebody of the Shijia gold deposit at different altitudes. The results show that the thermoelectric conduction type of pyrite in the Shijia gold deposit is dominated by P-type, which accounts for about 97.5% in the elevation range of -595~-165 m, indicating that the currently mined orebody is at the upper or top of the mineralization system. The thermoelectric coefficient (α) has a large discrete range, ranging from -288.3 to 304.9 μV/℃, indicating a significant vertical extension of the orebody. The dispersion of thermoelectric coefficient is 8%~68%, and the lower dispersion indicates that pyrite is formed under relatively stable conditions and has a good mineralization. The formation temperature of pyrite calculated by thermoelectric coefficient is concentrated between 210℃ to 250℃, indicating that the Shijia gold deposit is a medium temperature deposit. Orebody denudation rate (γ) calculated according to thermoelectric coefficient ranges from 25.5% to 34.0%, indicating that the orebody has not been significantly eroded and still extends to the deep. The cell parameter (a0) of pyrite is between 0.5418 nm and 0.5422 nm, slightly greater than the theoretical value of 0.54176 nm. Combined with the thermoelectric conduction type of pyrite and previous research, it is considered that the enlargement of cell parameter may be related to the isomorphic substitution of As and Sb for S. The above results clearly indicate that there is still a good prospecting potential in the deeper part below -600 m in the Shijia gold deposit.
keywords:pyrite thermoelectricity cell parameters deep prospecting prediction Shijia gold deposit Jiaodong
FENG LiQiang,GU XueXiang,ZHANG YongMei,SHEN RuiWen,ZHANG YingShuai,WANG PengFei,WANG DaWei.2023.Thermoelectricity and cell parameters of gold-bearing pyrite and their significance for prospecting of Shijia gold deposit in Penglai, Shandong Province[J].Mineral Deposits42(5):877~891