湘东金管冲铀矿床地球化学特征及其成因分析

湘东金管冲铀矿床位于区域性NNE―NE主干断裂附近,主要赋存于丫江桥复式花岗岩岩体的内外接触带中。对矿区的岩体、岩脉、矿石进行主量、微量元素,硫、氢和氧稳定同位素分析,以及流体包体分析。研究表明:成矿物质主要来源于地幔,其次有部分源自岩体或地层;成矿流体富碱(Ca~(2+)、Na~+、K~+)和富挥发分(CO_2、H_2O)具有极强的渗透能力、萃取能力;铀沉淀于中—低温、弱碱偏中性、强还原的环境。铀矿的形成与定位与晚燕山期华南陆块拉张作用所形成的岩浆岩密切相关。

Geochemical characteristics and genesis of Jinguanchong uranium deposit in Eastern Hunan

Jinguanchong uranium deposit of Eastern Hunan is located in the vicinity of regional NNE-NE-trending main fault,and occurs in the inner and the outer contact zone of Yajiangqiao composite granite rock mass.This paper conducted major and trace element analysis and stable sulfur,hydrogen and oxygen isotope analysis on the rock mass,dykes and ores from the mining area,as well as fluid inclusion analysis.The re-sults indicated that:the metallogenic materials predominantly originated from the earth mantle,and subordi-nately from rock mass or strata;the ore-forming fluid contained rich alkali (Ca2+,Na+,K+)and rich vola-tiles (CO2 ,H2 O),with great infiltrating and extracting capacity;the precipitation of uranium occurred in the environment of subalkalic-neutral highly reducing environment at medium-low temperature.The forma-tion and orientation of uranium deposit are closely related to magmatite formed under the extension of late Yanshanian South China Landmass.