招掖金矿带成矿模型的研究

Study on the metallogenetic model of Zhao-Ye gotd deposits belt

招掖金矿带的矿源层为形成于2.6—1.9Ga晚太古代的胶东群岩层。在1.9—1.4Ga期间,该岩层在经历区域变质面型混合岩化时的热液活动形成了金的初步富集和微弱矿化。在190～150Ma期间,印支—燕山的断裂混合岩化与局部重熔岩浆热液作用的迭加,金再次活化、迁移、富集。印支—燕山期系招掖金矿带的主成矿期。 本文按双层结构断裂模型观点,解释了玲珑式及焦家式两种不同矿化类型的成因,同本区发育的脆性断裂系统或韧性变形带的关系。并在此基础上建立了招掖金矿带的成矿模型。

The gold mineralization of Zhao-Ye gold metallogenic belt was originated from the migmatitic hydrothemal process in Proterozoic.The source bed-Jiaodong Group was formed initially at late Archaen(2.6-1.9 Ga) .During 1.9-1.4 Ga.it had undergone the migmatization of facial type,thus formed the concentration of gold and partial mineralization.During 190-150Ma, (Indosinian to Yanshanian),there occurred the super-imposition of fracture migmatization of linear type and partial anatectic magmatic hydro-thermal process.The gold again was remobilized, migrated and concentrated, and became the main metallogenic epoch of this belt.In terms of bilayered fractured structural model, the development of brittle and ductile deformation zones or fracture systems in this region demonstrated the genesis of two mineralization types, i.e. the fissure-filling type(correspond to Linglong type)and alteration type (correspond to Jiaojia type).Based on above recognization, the author establishes the metallogenic model of Zhao-Ye gold metallogenic belt.