烟台市牟平区宋家沟金矿床地质特征及找矿方向

Geological Characteristics and Prospecting Direction of Songjiagou Gold Deposit in Muping District of Yantai City

摘要:

胶莱盆地东北缘为胶东东部地区重要金矿成矿区，宋家沟金矿床为该区典型的蚀变岩型金矿床，该矿床的形成与分布受盆地及盆缘断裂的约束和控制，金矿体呈斜列展布，成群成带密集产出，矿体规模不等，品位、厚度及产状变化大。崖子断裂为该金矿床的导矿构造，荆山群及莱阳群为金矿矿源层，盆缘断裂所派生的NE向次级断裂严格控制着金矿体的产出，矿床成因为中温热液脉型金矿床。通过对矿床地质特征、矿石特征、金矿物特征及矿床成因等方面的研究和对找矿标志的总结，指出该区找矿方向，认为盆地边缘并在盆缘次级断裂发育地区找矿潜力较大，对中生代盆地边缘地区找矿具有一定的指导意义。

Abstract:

The northeastern margin of Jiaolai basin is an important gold mineralization area in eastern Shandong. Songjiagou gold deposit is a typical altered conglomerate type deposit. It is believed that the formation and distribution of this deposit are restricted and controlled by basin and margin fractures. The gold ore bodies are distributed in a diagonal way, and are concentrated in groups and belts. The ore bodies are of different sizes, and the grade, thickness and occurrence of gold deposits vary greatly. Yazi fault is the ore conducting structure of the gold deposit, and the deposit belongs to medium temperature hydrothermal vein type. Jingshan group and Laiyang group are the source bed of gold ores. The secondary fault with the trend of NE derived from the faults in the margin of the basin strictly controls the output of gold ore bodies, and the deposit is due to the medium warm hydrothermal vein type. Through study on geological characterisitcs of the deposit, ore characteristics, characteristics of gold deposits and the origin of the deposit and the summary of ore prospecting markers, the prospecting direction is pointed out in this area. It is believed that the edge of the basin has great potential for prospecting in the margin of the basin and in the secondary fault development region. It has a certain guiding significance for the prospecting ores in the marginal area of Mesozoic basin.