老李湾斑岩型银矿床矿石组构特征与银赋存状态

结合野外地质调查与室内分析结果，对河南崤山地区老李湾银矿的成矿地质条件、矿石组构特征及银的赋存状态进行了详细分析，结果表明：①矿体主要受断裂及其次级断层控制，成矿对围岩的选择性较差；②老里湾斑状二长花岗岩体与区内成矿关系较紧密，是区内主要的赋矿岩石；③矿区矿石结构以碎裂结构、粒状结构为主，矿石构造常见有块状构造、浸染状构造、脉状构造等，银矿物成分主要为自然银、硫铜银矿，次为银金矿、辉银矿、螺状硫银矿、深红银矿、淡红银矿等；④老李湾银矿具有与江西冷水坑斑岩型银矿相似的与矿化有关的蚀变类型和分带特征，显示崤山地区斑岩型银矿具有较大的找矿潜力。

Ore Fabric Characteristics and Silver Occurrence State of the Laoliwan Porphyry Silver Deposit

Combing with the geological investigation results and laboratory analysis results,the metallogenic geological conditions,ore-fabric characteristics and the occurrence state of silver of the Laoliwan porphyry silver deposit in Xiaoshan area,Henan province,the results show that:①the ore-bodies are mainly controlled by faults and its secondary faults,the selectively of metallogenic to surrounding rock is poor;②porphyry monzonitic granite rock mass of Laoliwan porphyry silver deposit is closely related to the mineralization in the mining area,it is the main ore-bearing rock mass;③the ore structure in the mining area is mainly for cataclastic structure and granular structure,the ore common structure are massive structure,disseminated structure and vein structure,the silver mineral composition are mainly for natural silver,sulfur,copper and silver ores,followed by silver and gold,argentite,acanthite,pyrargyrite,proustite;④the alteration type and zoning characteristics associated with mineralization of Laoliwan silver deposit are similar to the ones of Lengshuikeng porphyry silver deposit in Jiangxi province,which indicated that the prospecting potential of porphyry silver deposit in Xiaoshan area in Henan province is large.