江西省黄坑黑色岩系钒矿床微量元素地球化学特征及成矿背景分析  

Trace element geochemical characteristics and metallogenic background of V deposits in black rock series at Huangkeng area,Jiangxi provine

作　　者：李仁泽 周正兵 万建军[2] 陈骏 LI Renze;ZHOU Zhengbing;WAN Jianjun;CHEN Jun(Jiangxi Geology Bureau third geological brigade, Jiujiang 332000, Jiangxi, China;The State Key Lab of Nuclear Resources and Environment of the East China Institute of Technology, Nanchang 330013, China)

机构地区：[1]江西省地质局第三地质大队,江西九江332000 [2]东华理工大学核资源与环境国家重点实验室,南昌330013

出　　处：《地质找矿论丛》2021年第4期425-438,共14页Contributions to Geology and Mineral Resources Research

基　　金：江西省地质勘查基金项目(编号:20150021);江西省核工业地质局资源储备勘查项目(编号:2019UZK06)联合资助。

摘　　要：江西修武盆地寒武纪早期黑色岩系中富含多种稀散、稀土及放射性等元素,不乏赋存大型、超大型矿床。本文基于黄坑地区下寒武统荷塘组黑色岩系中富钒矿石(21件样品w(V)>4500×10^(-6),且连续厚度大于2 m)测试分析研究,探讨其微量元素地球化学特征及沉积成矿环境。研究结果表明:①矿样中V、As、Mo、Cd、Sb、U等元素的富集系数在10倍以上,其中Cd最大富集系数达822倍;w(V)=4954.64×10^(-6)~13041.21×10^(-6),相对于上地壳的富集系数达35~93倍;相对亏损Sc、Co、Ga、Nb、Ta、Sn、Zr、Hf、Th等元素。②矿样w(ΣREE)值介于67.75×10^(-6)~210.80×10^(-6)之间,w(LREE)/w(HREE)=2.14~5.55,w(Eu)/w(Eu^(*))=1.11~2.42,w(Ce)/w(Ce*)=0.45~0.64。③矿样的w(Ni)/w(Co)=10.80~54.71,w(V)/w(V+Ni)=0.96~0.99,w(V)/w(Cr)=6.91~41.80,w(U)/w(Th)值3.14~31.86,皆表明其形成于缺氧还原环境,且存在较强的海底热水沉积作用热水喷流沉积型钒矿床。The Early Cambrian black rock series in Xiuwu Basin of Jiangxi province is abundant with dispersed metals,REE and radioactive elements and large and super-large metal and nonmetal deposits of such elements occur here.Based on study of analysis of 21 samples of V-rich ore(w(V)>4500×10^(-6),>2 m thick)the trace element geochemical characteristics and sedimentary metallogenic environment are discussed and explored.The analysis and calculation are that 1)enrichment coefficients of V,As,Mo,Cd,Sb,U etc.of the samples is more than ten times of those of the upper crust,especially coefficient of Cd 822 times;w(V)=4954.54×10^(-6)13041.21×10^(-6),3593 times,but Sc,Co,Ga,Nb,Ta,Sn,Zr,Hf,etc.depleted;2)w(ΣREE)=67.75×10^(-6)210.80×10^(-6)),w(LREE)/w(HREE)=2.145.55,w(Eu)/w(Eu*)=1.11~2.42,w(Ce)/w(Ce*)=0.450.64,the ratio of w(Ni)/w(Co),w(V)/w(V+Ni),w(V)/w(Cr)and w(U)/w(Th)10.80-54.71,0.960.99,6.9141.80,and 3.1431.86 respectively.The above data indicate that the V-rich ore is formed under anoxic reduction hot water sedimentary environment thus the deposits are eruptive hot water sedentary ore deposits.

关 键 词：富钒黑色岩系 缺氧还原环境 热水沉积作用 荷塘组 修武盆地 江西省 

分 类 号：P611.22[天文地球—矿床学] P618.61[天文地球—地质学]