甘肃银硐梁锑矿床地质特征及控矿因素分析

近些年来,在西秦岭锑成矿带中发现了中型规模的甘肃银硐梁锑矿床。通过论述该锑矿床的地质特征,分析并讨论该矿床的控矿因素及找矿标志。结果表明: 该锑矿床主要赋存于三叠纪官亭群中部建造层第二岩性段、钙质硅化石英砂岩夹泥质粉砂岩的断层破碎带和层间破碎带中; 锑矿化明显受地层和断裂破碎带控制,为成矿提供成矿物质、热液条件和赋存空间,较早形成的NW向断裂是导矿构造,较晚形成的NE向次级断裂是赋矿构造; 成矿物质主要来源于地层,成矿热动力主要来源于构造运动,成矿作用以热液充填为主; 银硐梁锑矿床属于低温热液裂隙充填型层控矿床。

Geological characteristics and ore-controlling factors of Yindongliang antimony deposit in Gansu Province

In recent years, Yindongliang antimony deposit has been found in the antimony mineralization belt of West Qinling, and its size is medium scale. By discussing the geological characteristics of the antimony deposit, the authors analyzed the ore-controlling factors and prospecting indicators of the deposit. The results show that the antimony deposit mainly occurs in the fault fracture zones and interbedded fracture zones of calcareous silicified quartz sandstones intercalated with argillaceous siltstones, which belong to the second lithologic member of the central formation of Triassic Guanting Group. Antimony mineralization is obviously controlled by strata and fracture zones, which provide ore-forming materials, hydrothermal conditions and occurrence space for mineralization. The earlier NW-trending faults are the mineral transfer structures, and the posterior NE-trending secondary faults are mineral deposition structures. The ore-forming material is mainly derived from the strata, and the ore-forming thermal power is mainly derived from the tectonic movement. The mineralization is dominated by hydrothermal filling. Yindongliang antimony deposit belongs to the strata-binding deposit with low temperature hydrothermal fissure filling.