陕西凤太矿集区沈家湾金矿床地质特征及深部成矿预测

Geological characteristics and metallogenic prediction in deep part of the Shenjiawan Au Deposit in the Fengxian-Taibai ore concentration area,Shaanxi Province

沈家湾金矿床位于凤太矿集区西南部。结合以往资料,在总结沈家湾金矿床地质特征与成矿地质条件基础上,分析了矿床成因,并对矿床深部进行了成矿预测。研究表明:热水喷流形成的矿源层、NWW向剪切构造带叠加NE向断裂的构造样式,以及广泛发育的中酸性岩脉共同控制了金矿体的形成与就位;矿床成因属于与热水沉积有关的、受构造与岩浆改造的蚀变岩型金矿床,改造阶段为主成矿期。矿区化探异常、多期岩浆活动指示矿床深部有较大成矿潜力,并具有热液接触交代型金矿床的形成条件。

The Shenjiawan Gold Deposit is located in the southwest of the Fengxian-Taibai ore concentration area.Combined with the previous data,based on summary of the geological characteristics and metallogenic geological conditions of the Shenjiawan Gold Deposit,the genesis of the deposit was analyzed and the ore-forming prediction was carried out in the deep part of the deposit.The research indicates that the mineral source layer formed by the hot water jet,the structural pattern of the NE-trending fault superimposing the NWW-trending shear zone,and the extensively developed medium-acid veins jointly control the formation and location of the gold ore body;the genesis of the deposit belongs to the altered rock type gold deposit related to hydrothermal sedimentation and structural and magmatic transformation,and the transformation phase is the main mineralization period.The geochemical anomaly in the mining area and multi-stage magmatism indicate that there is great metallogenic potential in the deep part of the deposit,and the area has the formation conditions of the hydrothermal contact metasomatic gold deposit.