甘肃省天水市秦州区陈家山金矿地质特征与找矿标志

Geological features and prospecting criteria of Chenjiashan gold deposit in Qinzhou District,Tianshui City,Gansu Province

陈家山金矿位于西秦岭Pb-Zn-Cu(Fe)Au-Hg-Sb成矿带东段,为一受构造破碎带控制的中低温热液型金矿床。本文对其矿区地质特征、矿床地质特征进行了分析,总结了找矿标志。研究表明:矿体产于中泥盆系红岭山组(Dhl)微晶灰岩和砂质板岩岩层中,矿体产状与地层产状基本一致,矿体形态以脉状为主,工业类型主要为蚀变岩型,次要为石英脉型。地层、构造、岩性、围岩蚀变、地球化学标志等找矿标志明显,研究结果对红岭山组深部及外围今后地质找矿提供了有利的参考依据。

Chenjiashan gold deposit is located in the eastern part of the West Qinling Pb-Zn-Cu(Fe)Au-Hg-Sb metallogenic belt.It is a medium-low temperature hydrothermal gold deposit controlled by structural fracture zone.This paper analyzed geological features of the mining area and the deposit,and summarized the prospecting criteria.The study showed that the ore body occurred in the micrite and sandy slate of the Middle Devonian Honglingshan formation(Dhl).The occurrences of the ore body were basically consistent with occurrences of the stratum.The main shape of the ore body was vein,the main industrial type was altered rock type,and the secondary is quartz vein type.There were obvious prospecting criteria including strata,structure,lithology,wall rock alteration and geochemical indicators.The research results provided favorable reference for future geological prospecting in the deep and peripheral areas of Honglingshan formation.