陕西汉阴—石泉地区下志留统黑色岩系金矿控矿构造规律研究

研究区位于南秦岭下志留统梅子垭组黑色岩系金成矿带中,下志留统梅子垭组为汉阴—石泉地区黑色岩系金矿矿源层。文章以汉阴县药王金矿、石泉县羊坪湾金矿典型矿床为例阐述了研究区金矿控矿构造特征。研究认为,韧性剪切带在时间、空间和成因上与金矿关系密切,为主控矿构造;矿体主要赋存于韧性剪切带旁侧平行或小角度斜交的脆性断裂、片理化带及受韧性剪切带控制的S2褶皱面理内。矿化蚀变带内特定的构造环境对金的富集有利,平行于片理的岩石裂隙、微褶皱、劈理等次级构造是金沉淀富集的场所。金矿床成因类型为沉积-构造改造型。研究结果对南秦岭汉阴—石泉地区下志留统黑色岩系金矿勘查和研究具有参考价值。

Ore-controlling structures of the Lower Silurian black rock series gold deposits in the Hanyin-Shiquan area, Shaanxi

The study area is located in the black rock series gold mineralization belt of the Lower Silurian Meiziya Formation in the South Qinling Mountains. Taking the Yaowang gold deposit in Hanyin County and Yangpingwan gold deposit in Shiquan County as examples, this work discussed the ore-controlling structural characteristics of gold deposits in the study area. It is considered that the ductile shear zone is closely related to the gold deposits in time, space and genesis, and is the main control structure. The ore bodies mainly occur in brittle fractures with parallel or small-angle oblique side of ductile shear zone, foliated zone and S₂ fold plane controlled by ductile shear zone. The specific tectonic environment in the mineralized alteration zone is favorable for gold enrichment. The genetic type of gold deposit is sedimentary-tectonic transformation. The result provides guidance for the exploration and research of the black rock series gold deposits in the Lower Silurian in the Hanyin-Shiquan area of the Southern Qinling Mountains.