玉华山火山盆地铀矿床为山—筒山断裂带控矿特征

Ore-controlling characteristics of Weishan-Tongshan fault zone in the uranium deposit of volcanic basin of Yuhua Mountain

在简述玉华山地区地质背景的基础上,阐明为山—筒山断裂带地质特征,分析其对铀矿控制特点,总结铀矿化富集规律。认为为山—筒山断裂带不仅是玉华山火山盆地控岩构造,而且是重要的控矿、导矿和容矿构造。控矿构造可划分为:主构造对矿化的控制、旁侧次级构造对矿化的控制和主构造与岩性组合对矿化的控制3种形式。铀矿化富集一方面与断裂构造发育程度有关;另一方面与断裂构造充填物关系密切,特别是与充填于断裂带中花岗斑岩形态及产状变化密切相关。今后玉华山地区铀矿找矿工作,可把控矿构造作为主要研究目标。

On the basis of brief introduction to geological background of Yuhua Mountain region,geological characteristics of Weishan-Tongshan fracture zone were elaborated and ore-controlling role of the fracture zone was analyzed and the enrichment rule of uranium mineralization was summarized.Weishan-Tongshan fracture zone was considered not only as controlling the volcanic basin, but also as controlling transportation and storing of the mineralization. The ore-controlling role can be divided into three kinds, such as main fault, secondary fault and lithology-main fault combination. The mineralization enrichment depends on the density of the fault structure and the fillings of fracture,particularly related to the form and occurrence of granite porphyry. The ore-controlling fracture should be emphasized in future uranium exploration work in Yuhua Mountain region.