河南商城县罗家湾钼矿床地质特征及成矿机理探讨  

Geological characteristics and metallogenic mechanism of Luojiawan molybdenum deposit in Shangcheng County of Henan

作　　者：徐公权 XU Gongquan(Mineral Resources Exploration Center of Henan Geological Bureau,Zhengzhou 450012,Henan,China)

机构地区：[1]河南省地质局矿产资源勘查中心,河南郑州450053

出　　处：《矿产与地质》2023年第3期473-480,共8页Mineral Resources and Geology

基　　金：河南省地质矿产勘查开发局第三地质调查队“河南省商城县罗家湾钼矿普查”项目资助。

摘　　要：秦岭—大别造山带是我国重要的钼矿成矿带,其间蕴藏着多种类型钼矿床,罗家湾钼矿即产于此成矿带。在总结罗家湾钼矿床地质特征基础上,结合矿区岩石化学、矿石硫、氧同位素分析结果,对该矿的矿床成因进行了研究,进而探讨了成矿机理和找矿前景。研究表明,钼矿化的范围、规模、品位、产状等与罗家湾花岗斑岩体高度一致,矿化具有分带性并与蚀变分带呈现高度相关;花岗斑岩来源于地壳与地幔的混合物,成矿物质钼是花岗斑岩自身携带而来,属斑岩型钼矿;中生代以来,造山带陆内俯冲,使地壳增厚、下部地壳发生部分重熔,形成了含钼花岗岩浆,至燕山期,岩浆顺NWW向桐柏—商城断裂带和NNE向商城—麻城断裂带交汇部位侵位于地壳浅部而成矿。研究成果可为探寻本区成矿远景和大别山地区寻找Au、Ag、Cu、Pb、Mo等金属矿提供参考。Qinling-Dabie orogenic belt is an important molybdenum metallogenic belt in China,in which there are many types of molybdenum deposits,and Luojiawan molybdenum deposit is located at this metallogenic belt.On the basis of summary of the geological characteristics of Luojiawan molybdenum deposit,combined of the analysis result of granite petrochemistry,ore sulfur and oxygen isotope analysis data,the deposit genesis is studied,and the metallogenic mechanism and prospecting prospect are also discussed.The study result shows that the range,scale,distribution direction,grade and occurrence of molybdenum mineralization are highly consistent with Luojiawan granite porphyry.The mineralization has zonation feature and is highly correlated with alteration zonation.Granite porphyry originates from the mixture of crust and mantle magma,metallogenic material molybdenum is carried by granite porphyry itself,the genetic type of the deposit belongs to porphyry molybdenum deposit.Since Mesozoic era,the intra-continental subduction of the orogenic belt has thickened the crust and the lower crust is partially remelted,resulting in the formation of Molybdenum-bearing granite magma.In Yanshan stage,the magma invades the shallow part of the crust along the intersection of the NWW-trending Tongbai-Chengcheng fault zone and NNE-trending Chengcheng-Macheng fault zone and the mineralization is formed.The study result can provide a reference for the exploration of metallogenic prospect and the exploration work of Au,Ag,Cu,Pb,Mo resources and other metal deposits in Dabie Mountain area.

关 键 词：罗家湾钼矿 秦岭—大别造山带 斑岩型钼矿 成矿机理 河南商城 

分 类 号：P618.65[天文地球—矿床学]