秦岭造山带发现新型铀多金属矿:华阳川与伟晶岩脉和碳酸岩脉有关的超大型铀-铌-铅-稀土矿床

发布时间：2019-01-01 07:42

【摘要】：华阳川铀多金属矿位于华北板块南缘小秦岭构造带的西段,是一个以U、Nb、Pb为主并伴生有稀有稀土元素的可综合利用的超大型矿床。矿体主要赋存于太古代TTG片麻岩套中(武家坪黑云斜长片麻岩和大月坪花岗片麻岩)。矿化与伟晶岩脉、火成碳酸岩脉和碳酸盐脉紧密共生。伟晶岩脉主要由微斜长石、石英以及黑云母、角闪石、褐帘石、榍石和独居石组成。火成碳酸岩脉主要由方解石、石英、重晶石、霓辉石、钠闪石、黑云母和磷灰石等组成。碳酸盐脉主要由方解石、石英、重晶石和沸石等组成。根据脉体穿插关系和矿物组合特征,矿化可分为伟晶岩阶段、早期碳酸岩阶段和晚期碳酸盐化阶段,伟晶岩阶段和早期碳酸岩阶段以铀铌矿化为主,晚期碳酸盐化阶段则以铅矿化为主。铀矿物以铌钛铀矿为主,晶质铀矿次之;铌矿物以铌钛铀矿为主,褐钇铌矿次之;铅矿物以方铅矿为主,白铅矿次之。此外,U、Nb还以类质同像或吸附的形式赋存于褐帘石、独居石和磷灰石等富集稀土元素的矿物中。根据含矿主岩、矿石矿物以及成矿元素组合特征,认为华阳川矿床不同于世界上其他类型的铀矿床,属于与伟晶岩和碳酸岩有关的铀-铌-铅-稀土矿床。
[Abstract]:The Huayangchuan uranium polymetallic deposit is located in the western section of the Xiaoqinling tectonic belt on the southern margin of the North China plate. The orebody is mainly located in the Archean TTG gneiss suite (Wujiaping Heyunshinobian gneiss and Dayuping granitic gneiss). Mineralization is closely associated with pegmatite veins, igneous carbonatite veins and carbonate veins. The pegmatite vein is mainly composed of microplagioclase, quartz, biotite, hornblende, cinnamon, sphene and monazite. Carbonate veins are mainly composed of calcite, quartz, barite, aegiropyroxene, sodium amphibole, biotite and apatite. Carbonate veins are mainly composed of calcite, quartz, barite and zeolite. According to the interpenetrating relationship of vein and mineral assemblage, mineralization can be divided into pegmatite stage, early carbonatite stage and late carbonation stage, pegmatite stage and early carbonatite stage dominated by uranium and niobium mineralization. The late carbonization stage is dominated by lead mineralization. The main uranium minerals are niobium and titanium uranium, the second are crystalline uranium, the niobium minerals are niobium-titanium uranium, the brown yttrium niobium is the second, the lead is galena, the second is white lead. In addition, UHNb also exists in minerals enriched with rare earth elements, such as cinnamon, monazite and apatite, in the form of similar or adsorption. According to the characteristics of ore-bearing main rocks, ore minerals and metallogenic elements, the Huayangchuan deposit is different from other types of uranium deposits in the world and belongs to uranium-niobium-lead-rare earth deposits related to pegmatite and carbonatite.
【作者单位】：中陕核工业集团二二四大队有限公司;中国科学院广州地球化学研究所矿物学与成矿学重点实验室;
【基金】：国家重点研发计划“深地资源勘查开采”专项(2017YFC0602304,2017YFC0602205) 陕西省自然科学基础研究计划面上项目(2016JM4009) 陕西省地勘基金(61201405236)
【分类号】：P619.14;P619.2

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