燕山西段蔡家营-御道口断裂带的地质特征及其对铀成矿的控制作用

Geologic Features of Caijiaying-Yudaokou Fracture Zone in the Western Yanshan Mt.and Its Control Role on Uranium Mineralization

野外实地考察和钻探工作证实,位于燕山西段的蔡家营-御道口断裂带是在早期EW向基底断裂基础之上发展起来的一组扭裂带,由一系列NEE向断层斜列组成,对早白垩世早期张家口组三段长英质火山岩有明显的控制作用。该断裂带与NNW向断裂交切形成的断块控制了铀及多金属矿床(点)的分布,使铀矿床(点)具有约为15km或30km的等间距展布特征。这些特征表明,受断裂构造控制的断块构造是有利的铀成矿构造,是燕山火山岩带寻找铀矿值得重视的一种控矿构造组合。

Based on field investigation and drilling exploration, the Caijiaying-Yudaokou fracture zone located in the western Yanshan Mt. is a set of twist fracture belts. It originated from the original EW basement fractures. Its composition includes a series of NEE faults and slant.fissures. This fracture zone has obvious control actions on the third segment felsic volcanic of Zhanjiakou formation which has formed in the Early Cretaceous epoch. Fault block formed in the intersection of this fracture zone and the NNW fractures controlled the distribution of uranium and multi-metal deposits. The uranium deposits present a evenly distribution Of around 15 or 30 km. All indicate that the fault blocks controlled by fracture structure are better for uranium mineralization and as ore-controlling structure in Yanshan volcanic belts, the fault blocks are valuable for uranium prospecting.