胶西北焦家式和玲珑式金矿的形成机理

forming Mechanism of Jiaojia Type Gold Deposit and Linglong Type Gold Deposit in Northwest Jiaodong Area

摘要:

在胶西北地区，中生代郭家岭超单元岩浆期后成矿热液，形成了广泛发育的焦家式(蚀变岩型)和玲珑式(石英脉型)金矿床，并且具有相同的成矿热液，之所以产生两类有较大差异的上述不同类型的金矿床，在于“热液房”与外界的沟通条件有很多的不同。蚀变岩型金矿的“热液房”与外界沟通相对开放，成矿热液的压力迅速降低，促其汽化，增强了活动，有利于广泛交代作用的产生，导致了蚀变岩型矿床的形成；石英脉型的矿床“热液房”与外界沟通条件差，当温度下降后，才与外界沟通，主要表现为充填作用，而形成石英脉型矿床。

Abstract:

In the northwest Jiaodong area, ore—forming hydrothermal fluids after magmatic period in Mesozoic Guojialing superunit had formed Jiaojia type (altered rock type) and Linglong type (quartz vein type) gold deposits. These two deposits had the same ore—forming hydrothermal. Different types of deposits were formed by different communication conditions between "hydrothermal room " and the outside world. The "hydrothermal room " of altered rock type gold deposit was relatively open with the outside world. The pressure of hydrothermal mineralization could decrease rapidly, and sped up the vaporization. It was favorable for the generation of extensive metasomatism, and casused the formation of altered rock type gold deposits. The "hydrothermal room " of quartz vein type deposits had poor communication with the outside world. When the temperature dropped, the deposit would communicate with the outside world and mainly represented as the filling function, and formed quartz vein type gold deposits.