摘要
老柞山金矿经历了早、晚两期成矿地质作用。通过对矿质来源、控矿构造、流体特征、成矿时代等控矿因素的分析 ,确定早期成矿作用为中高温热液蚀变岩型 ,矿体受北西西—东西向张性断裂控制 ,成矿年龄为 (2 39± 34 )Ma,与华力西晚期的岩浆活动有关 ;晚期成矿作用为中温热液充填脉型 ,矿体受北北西—北西向压扭性断裂控制 ,其成因与燕山期的岩浆活动有关。两期成矿作用的成矿物质主要来自于上地幔 ,并有部分壳源物质的加入。
The Laozuoshan gold deposit was formed after two epochs of mineralization process. Through extensive researches on metallogenic factors of ore-forming resources, controlling structures, fluid features, and metallogenic epoch, etc., a genetic model can be got as follows. The earlier mineralization is hypo-mesothermal alteration type. Orebodies are controlled by NWW-EW directional fractures and metallogenic age is 239±34Ma. It is closely related to Variscan-epoch magmatic activity. The later mineralization is mesothermal filling type. Orebodies are controlled by NNW-NW directional fractures and related to Yanshanian magmatic activity. Ore-forming materials of those two mineralization are mainly deprived from upper-mantle and down-crust. Au is mainly deprived from wallrocks. Large-scale migmatitic granites and mylonite caused by Precambrian metamorphism and ductile shear-deformation are regenerated source bed of Au.
出处
《地质与勘探》
CAS
CSCD
北大核心
2002年第2期18-22,共5页
Geology and Exploration
