Geological characteristics and origin of the Mogou fluorite deposit in Fangcheng County, Henan Province
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摘要: 方城县莫沟萤石矿床是河南省南部萤石成矿带的主要组成部分之一, 产于新元古界煤窑沟组内。本文在剖析莫沟萤石矿床地质特征的基础上, 开展了岩相学、岩石地球化学研究, 约束了成矿物质来源, 探讨了矿床成因机制。结果表明:萤石矿体呈脉状、透镜状产出, 与成矿有关的蚀变有硅化、萤石化、绢云母化等, 矿石构造类型主要为块状, 次为条带状、条纹状、角砾状。萤石矿体与煤窑沟组大理岩、燕山期似斑状斜长花岗岩的球粒陨石标准化稀土元素配分模式基本一致, 显示成矿物质来源与煤窑沟组大理岩和燕山期似斑状斜长花岗岩有关, 应为富含F元素的含矿热液沿层间断层侵入并与围岩发生反应, 沉淀形成萤石矿(化)体, 矿床成因类型为低温热液沿层间构造充填型矿床。Abstract: The Mogou fluorite deposit of Fangcheng County, residing in the Neoproterozoic Meiyaogou Formation, is a crucial part of the fluorite metallogenic belt in southern Henan Province. Based on the analysis of the geological characteristics of the Mogou fluorite deposit, this study conducted petrographic and petrogeochemical studies to define the source of ore-forming materials and probe into the genetic mechanism of the fluorite deposit. The results show that the fluorite ore body is veined or lenticular, with mineralization-related alterations composed of silicification, fluorite and sericite alterations. Its ore structures are primarily massive, followed by banded, striped, and brecciated types. The chondrite-normalized rare earth element distribution pattern of the fluorite ore body is similar to that of the Meiyaogou Formation marbles and the Yanshanian porphyritic plagiogranites, suggesting a genetic relationship. The possible genetic mechanism is that the F-enriched ore-bearing hydrothermal liquids intruded along the interbedded fault and reacted with the surrounding rocks to form the fluorite ore /mineralized body. The deposit belongs to the epithermal filling type along the interbedded structure.
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Key words:
- fluorite deposit /
- deposit characteristics /
- rare earth element /
- ore-forming materials /
- origin /
- metallogenetic mode
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