山东海阳郭城地区金矿床成矿特征

Mineralization Characteristics of Gold Deposit in the Guocheng Region,Haiyang,Shandong Province

近年来,在山东海阳郭城地区郭城断裂下盘发现了多处金矿床(点)。研究发现,该地段金矿成矿特点与胶东其它地区存在较大的差异。通过对矿区的矿床地质、控矿构造和成矿流体等方面的研究,揭示了该地区金矿体形态复杂和产状多样的原因系多组结构面联合控矿所致。区内成矿期构造应力场是以郭城断裂为主干断裂的左行剪切作用,成矿流体环境为中高盐度的H2O-CO2-NaCl-CaCl2体系,硫同位素特征反映了成矿热液来源于古老变质岩部分熔融形成的壳源岩浆热液。

In recent years,many gold deposits （outcrops） have been discovered in the footwall of the Guocheng fault in the Guocheng region,Haiyang,Shandong Province. Studies have found that the mineralization characteristics of these gold deposits are very different from other areas in the Jiaodong Peninsula. The studies on the deposit geology,ore-controlling structures and ore-forming fluid reveal that complexity of shapes and diversity of occurrences of ore bodies were resulted from multiple-group of ore-controlling structures. In this area,the tectonic stress field of mineralization time was left-shear on the major Guocheng fault. The ore-forming fluid was the H2O-CO2-NaCl-CaCl2 system with medium-high salinity. Sulfur isotopic compositions reflect that mineralization fluid was from crustal magmatic hydrotherm formed by partial melting of ancient metamorphic rocks.