内蒙古锦山火山盆地构造岩浆活动与铀成矿的关系

The Relationship between Tectono Magmatic Activity and Uranium Mineralization in Jinshan Volcano Basin Inner Mongolia

锦山火山盆地位于华北陆块北缘沽源–红山子铀成矿带东部。该成矿带先后发现了张麻井(460)、大官厂(534)、红山子(470)等铀矿床,近年来随着铀矿找矿工作的不断深入,在核桃坝、红山子等地区不断取得新的突破,研究区与这些产铀火山盆地有着相似的地质背景和成矿地质条件。盆地两侧受北东向深大断裂控制,呈现断陷性质,基底主要由富铀花岗岩体组成,盖层火山岩具有多旋回、多期次的特点,发育齐全,构造岩浆活动强烈,铀的活化、迁移、叠加富集等成矿作用十分突出,盆地内已发现较多火山热液型铀矿化异常点(带),集中分布于构造交汇复合部位或局部基底隆起部位,显示出铀成矿作用与构造岩浆活动关系密切,具有较好的成矿潜力和找矿前景。

Jinshan volcano basin is located in the east of Guyuan-Hongshanzi uranium metallogenic belt in the northern margin of the North China, The metallogenic belt has been found in 460,534 and 470 uranium deposit in recent years, with the deepening of the work of uranium prospecting, has made new breakthroughs in Hetaoba and Hongshanzi. Study area and the uranium volcano basin have similar geological conditions and metallogenic geological background. On both sides of the basin is control by NE trending deep faults, present the nature of the fault depression, the basement is mainly composed of uranium rich granites. The cover layer is composed of the volcano rock formation of multiple cycle and period of intense tectonic and magmatic activities, uranium activation, migration, enrichment and mineralization superposition is very prominent, In this basin have found many volcano hydrothermal type uranium mineralization. It is concentrated in the structural intersection, composite site or local uplift, showing that the uranium mineralization is closely related to the structural magmatic activity and the study area has better metallogenic po-tential and prospecting prospect.