皖南地区萤石矿控矿因素及成矿规律研究  

Study on ore-controlling factors and metallogenic regularity of fluorite deposits in southern Anhui

作　　者：孙辉 左延龙 王昭文 檀荣华 SUN Hui;ZUO Yanlong;WANG Zhaowen;TAN Ronghua(No.332 Unit,Bureau of Geology and Mineral Exploration of Anhui Province,Huangshan,Anhui 245000,China)

机构地区：[1]安徽省地质矿产勘查局332地质队,安徽黄山245000

出　　处：《安徽地质》2024年第4期300-305,共6页Geology of Anhui

基　　金：安徽省自然资源科技项目“皖南地区萤石矿地质成矿特征及找矿方向研究”(编号:2023-K-14)资助。

摘　　要：皖南萤石矿集区位于皖南-赣北萤石矿成矿区带北东段,萤石矿资源丰富,近年来找矿成果显著。在系统搜集前人资料的基础上,结合最新勘查成果,对皖南萤石矿控矿因素进行研究,总结出区域地球化学、北东-北北东向断裂及裂隙带、燕山中、晚期酸性岩浆、环形构造、围岩岩性岩相及特定的围岩蚀变是萤石矿主要控矿因素。区内萤石矿主要形成于燕山中、晚期(<145Ma),多为岩浆期后热液充填型矿床;区域断裂控制着萤石矿带的分布,断裂性质控制矿体形态、规模、矿石质量及矿体空间展布;主要赋矿地质体为燕山中晚期斑状、似斑状花岗岩和(黑云母)二长花岗岩,其次为凝灰质粉砂岩和变质流纹岩,再次为泥质碳酸盐和碎屑岩。皖南燕山中、晚期酸性岩浆岩的内外接触带以及反映岩浆侵位行迹的环形构造分布区、化探氟异常、硅化与其他低温热液蚀变组合是萤石矿的找矿标志。The fluorite ore deposit cluster in southern Anhui is located in the northeastern segment of the fluorite metallogenic belt that spans southern Anhui and northern Jiangxi.This region is abundant in fluorite resources and has seen significant prospecting achievements in recent years.Based on a systematic collection of previous data and the latest exploration results,this study probes into the ore-controlling factors of the fluorite deposits in southern Anhui,which are identified as regional geochemistry,NE-NNE trending faults and fracture zones,mid-late Yanshanian acidic magmatism,ring structures,wall rock lithology and facies,and specific wall rock alterations.The fluorite deposits in the region mainly formed in the mid-late Yanshanian period(<145 Ma)and are predominantly post-magmatic hydrothermal filling deposits.Regional faults control the distribution of fluorite belts,and their natures influence the shape,scale,quality,and spatial distribution of the ore bodies.The primary ore-hosting geological bodies are mid-late Yanshanian porphyritic,pseudo-porphyritic granite,(biotite)monzogranite,followed by tuffaceous siltstone and metamorphosed rhyolite,and to a lesser extent,argillaceous carbonate and clastic rocks.Consequently,the inner-outer contact zones of mid-late Yanshanian acidic magmatic rocks in southern Anhui,areas with ring structures indicating magmatic emplacement,geochemical fluorine anomalies,silicification,and other low-temperature hydrothermal alteration combinations are key indicators for fluorite prospecting.

关 键 词：萤石矿 花岗岩 断裂 环形构造 找矿标志 皖南 

分 类 号：P612[天文地球—矿床学]