北秦岭成矿带洛南黄龙铺地区钼铀矿成矿特征及找矿方向研究  

Metallogenic Characteristics and Exploration Orientation of Uranium-Molybdenum Deposits in Huanglongpu Area of Luonan,North Qinling Metallogenic Belt

作　　者：廉康 王天 王江波 冯伟 LIAN Kang;WANG Tian;WANG Jiangbo;FENG Wei(Research Institute No.203,CNNC,Xi’an,Shaanxi 710086,China)

机构地区：[1]核工业二〇三研究所,陕西西安710086

出　　处：《铀矿地质》2024年第6期1158-1168,共11页Uranium Geology

基　　金：核工业二〇三研究所铀矿区域评价项目“陕西省北秦岭成矿带洛南地区铀-多金属矿资源调查评价”(编号:202314-1);陕西省自然科学基金项目“北秦岭成矿带东段古生代淡色花岗岩成因与铀成矿作用研究”(编号:2024JC-YBMS-235)联合资助

摘　　要：黄龙铺地区钼铀矿位于北秦岭北西向铀-铌-铅-稀土-稀有金属成矿带和北东向钼-铅-锌-铜成矿带交汇部位,发育桃园钼铀矿床、石家湾钼矿床、大石沟钼铀矿床、西沟钼铀矿床和宋家沟钼铀矿床。文章通过对赋矿围岩、矿体展布特征、矿石特征及围岩蚀变等成矿特征进行系统总结,探讨黄龙铺地区成矿作用及成矿规律。研究认为,钼铀矿化形成于晚三叠世碰撞造山后伸展背景,受北西向张扭性断裂及北东向压扭性断裂控制,含矿岩性为含钾长石碳酸岩和石英方解石碳酸岩,辉钼矿与晶质铀矿、铌钛铀矿共生,为同时期岩浆活动的产物。地表发育强烈褐铁矿化、黄铁矿化蚀变,并叠加在早期硅化、钾长石化蚀变之上为研究区主要找矿标志,指出大石沟深部及西南外围、宋家沟及西沟一带为铀成矿有利部位。Huanglongpu Mo-U deposit is located at the intersection of the northwest-trending uranium-niobium-lead-rare earth-rare metal metallogenic belt and the northeast-trending molybdenum-lead-zinc-copper metallogenic belt,which includes the Taoyuan uranium-molybdenum deposit,Shijiawan molybdenum deposit,Dashigou molybdenum-uranium deposit,Xigou molybdenum-uranium deposit,and Songjiagou molybdenum-uranium deposit.Based on a systematic summary of the host rock,orebody distribution features,ore properties,and wall rock alteration,the mineralization process and its pattern were discussed.It was believed that the molybdenum-uranium mineralization was formed during the Late Triassic extensional action after the collisional orogeny.The deposit is controlled by northwest-trending extensional shear faults and northeast-trending compressional shear faults.The hosting rocks consist of K-feldspar carbonatite and quartz-dolomite carbonatite.Molybdenite is symbiotic with uraninite and brannerite,is the product of magmatism at the same time.Strong ferritization and pyritization widely distributed in the surfaces and superimposed on the earlier silicification and potash feldspathization,which are regarded as the key exploration indicators.The deep part of Dashigou,as well as the southwestern periphery,Songjiagou,and Xigou areas were proposed as the favorable location for uranium metalization.

关 键 词：北秦岭成矿带 成矿特征 找矿方向 钼铀矿 

分 类 号：P619.14[天文地球—矿床学]