辽宁翁泉沟铁-硼-铀矿床成矿年代学研究

Metallogenic Chronology of Wengquangou Fe-B-U Deposit in Liaoning

辽宁翁泉沟含铀铁硼矿床是一个综合开发利用的超大型铁-硼-铀矿床,对该矿床铀成矿年代学开展研究对认识该矿床成矿规律及形成过程十分重要,也对探讨辽东地区辽河群内铀矿化特征和区域铀成矿规律有着重要意义。文章在大量野外和室内地质工作基础上,对翁泉沟东台子矿段和矿区内暖河堡硼铁矿矿石中粒状的晶质铀矿开展了电子探针化学定年研究得到了(1953±11)Ma和(1862.6±9.8)Ma两个化学年龄,铀矿物形成年龄也代表了该地区铁-硼-铀矿床中两期的铀矿化形成年龄。辽东地区经历了强烈挤压环境下的造山运动并伴随着强烈的区域变质作用,铀矿化正是在这种背景下所形成。

Wengquangou uranium bearing Fe-B deposit in Liaoning is a super large-scale Fe-B-U deposit by comprehensive development and utilization.Study on uranium metallogenic Chronology is very important to understand the evolution process of the deposit,the metallogenic pattern and exploration of uranium mineralization of Liaohe Group in Eastern Liaoning.Based on field and indoor geological work,this paper investigates the granular uraninite from Wengquangou-Dongtaizi block and Nuanhepu deposit by electron microprobe chemical dating.Two chemical ages of(1953±11)Ma and(1862.6±9.8)Ma were dated.The age of uranium mineral formation was believed to represents the formation age of two stages of uranium mineralization in the iron boron uranium deposit in the area.In eastern Liaoning,orogeny in a strong compressional environment was accompanied by strong regional metamorphism and result in favorable background for uranium mineralization.