浙江衢州地区铀成矿流体来源及其迁移富集机理  

The Source of Uranium Metallogenic Fluid and its Migration and Enrichment Mechanism in Quzhou Area,Zhejiang

作　　者：刘蓉蓉[1] 李子颖[1] 汤江伟 徐小奇 LIU Rong-rong;LI Zi-ying;TANG Jiang-wei;XU Xiao-qi(Beijing Research Institute of Uranium Geology,Beijing,BJ 100029,China;Geological Party No.269,Nuclear Geological Bureau in Jinhua,Jinhua,ZJ 321000,China;Sinosteel Corporation,Beijing,BJ 100080,China)

机构地区：[1]核工业北京地质研究院,北京100029 [2]浙江省核工业269大队,浙江金华321000 [3]中国钢铁集团,北京100080

出　　处：《东华理工大学学报（自然科学版）》2018年第2期101-110,共10页Journal of East China University of Technology(Natural Science)

基　　金：全国矿产资源潜力评价之全国铀矿资源潜力评价项目(1212010733812)

摘　　要：新路和大洲火山岩盆地分属于不同的大地构造位置,是赣杭铀成矿带东段重要的产铀区,其成矿特征具有很强的代表意义。通过流体包裹体研究发现该区发育气液两相盐水包裹体、CO_2(含)多相包裹体、纯气体包裹体和含子矿物多相包裹体,其均一温度和盐度在成矿期明显增高。含子矿物三相包裹体显著发育,表明铀成矿是在流体沸腾作用机制下形成。成矿流体总体为富含卤素、硫及碱金属的C-H-O流体,δ^(34)S值在大洲矿区为2.6‰~5‰,平均为3.8‰,在新路矿区为-16.3‰~14.9‰,平均为2.1‰,结合不同区段地质特征分析,认为成矿流体来源于地壳深部或上地幔。研究认为深部铀元素是通过铀氢化物、铂合金氮化物从上地幔、地壳深部迁移至地壳浅部成矿,浅部铀元素是通过热液蚀变萃取并以碳酸盐配合物迁移富集成矿。The Xinlu and Dazhou volcanic basin,which are important uranium producing areas in the eastern section of the Ganhang uranium metallogenic belt,belong to different tectonic positions. There are strongly representative metallogenic characteristics. By the research of fluid inclusions,the gas-liquid two-phase brine inclusions,CO_2（ including） multiphase inclusions,pure gas inclusions and multiphase inclusions containing subminerals were found. The homogenization temperature and salinity increased significantly in mineralization stage in which there are many three-phase inclusions containing subminerals,which indicate that uranium mineralization is formed under the boiling mechanism of fluid. The ore-forming fluid that is C-H-O fluid rich in halogen,sulfur and alkali metal,δ^34 S value 2. 6‰ - 5‰,average 3. 8‰,in Dazhou area and-16. 3‰ - 14. 9‰,average 2. 1‰ in Xinlu area,show that the source of ore-forming fluids came from deep crust or upper mantle combined with the analysis of geological characteristics in different sections. The study of metallogenic mechanism suggested that the deep uranium elements are migrated and enriched from the upper mantle or the deep crust to shallow crust by uranium hydrides and platinum alloy nitrides,and shallow uranium elements are migrated and enriched with carbonate complexes extracted by hydrothermal alteration.

关 键 词：衢州地区 成矿流体 流体来源 富集机理 

分 类 号：P619.14[天文地球—矿床学]