Geological Characteristics, Genetic Types and Utilization Value of Yonghong Fluorite Deposit in Mabian Area, Southwest Sichuan and Its Enlightenment to Regional Prospecting
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摘要:
四川地区属于缺乏萤石矿和无萤石成矿区带分布的地区，本次在马边地区发现中型萤石矿床，具有重大的意义。通过野外地质调查和收集分析地质资料，探讨了马边地区永红萤石矿床的矿床成因以及对区域找矿的启示。结果表明，矿体产出于寒武系纽芬兰统筇竹寺组粉砂岩中，严格受断层控制，成矿要素为白云岩、灰岩、含氟磷块岩和断裂，无火山岩和侵入岩，而前人总结的热液充填型萤石矿床中的5种亚类型均有火山岩或侵入岩，因此本次总结为另一种热液充填型萤石矿床亚类型——永红式热液充填型萤石矿（断裂+碳酸盐岩+含氟磷酸盐）；马边地区永红萤石矿查明资源量45.0万 t，CaF2平均品位34.61%，为中型萤石矿床；经选矿实验研究，经一次粗选和七次精选，可获得产率为26.17 %，品位为91.35 %，回收率61.34 %的萤石精矿，可选性较好，属于易选矿石；通过成矿要素对比分析，峨边-金阳大断裂带上的马边、雷波、金阳地区具有较好的萤石找矿前景，以上成果对填补四川无萤石成矿带的空白和指导峨边-金阳大断裂带的区域找矿及推动乌蒙山区经济发展都具有重要意义。
Abstract:Sichuan is an area where there are no fluorite deposits and no fluorite metallogenic belts. The discovery of medium-sized fluorite deposit in Mabian area is of great significance. Through field geological investigation and collection and analysis of geological data, the genesis of Yonghong Fluorite deposit in Mabian area and its enlightenment to regional prospecting are discussed. The results showed that the ore body occurs in the siltstone of Qiongzhusi Formation of Cambrian Terreneuvian, which is strictly controlled by fault. The metallogenic factors are dolomite, limestone, fluorine-containing phosphorites and fault, and there are no volcanic rock and intrusive rock. The five subtypes of hydrothermal filling type fluorite deposits summarized by predecessors have volcanic rock or intrusive rock. Therefore, it is summarized as a new subtype of hydrothermal filling fluorite type deposit-Yonghong subtype of hydrothermal filling type fluorite deposit (fault+carbonate rock+fluorophosphate); Yonghong fluorite deposit in Mabian area is a medium-sized fluorite deposit with an identified resource of 450000 t and its average content of CaF2 was 34.61%; Through the comparative analysis of metallogenic factors, Mabian-Leibo-Jinyang areas on Ebian-Jinyang fault zone have good fluorite prospecting prospects. The above results are of great significance to fill the gap of fluorite without metallogenic belt in Sichuan, guide the regional prospecting of Ebian-Jinyang fault zone and promote the economic development of Wumeng Mountains region.
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表 1 马边地区永红矿区萤石精矿多元素分析结果/%
Table 1. Multi element analysis results of fluorite concentrate in Yonghong ore district of Mabian area
CaF2 BaSO4 CaCO3 Al2O3 Fe2O3 SiO2 SrSO4 97.05 0.97 1.01 0.06 0.03 0.75 0.05 
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