安徽五河地区河口铅金矿成矿地质条件及成矿模式

Metallogenic geological conditions and metallogenic model of the Hekou Pb-Au deposit in the Wuhe area, Anhui Province

矿床地质特征及成矿条件分析是同地区寻找同类矿床的重要手段。在总结前人研究成果的基础上,对安徽五河河口铅金矿的矿床地质特征、成矿条件、控矿因素和成矿模式进行详细讨论,认为太古宇变质基底既是该矿床的赋矿层位,又是原始矿源岩系;主要控矿因素为断裂构造,尤其是北北东—北东向和南北向断裂。推测其成矿模式为地壳物质经深部熔融、重融作用形成高温混合花岗状岩浆熔融体,侵入到地壳上层岩石,在结晶过程中,富集的气化高温初始混合岩浆上升到已冷凝或亚凝固的花岗状岩石,发生碱交代作用,导致已固化岩石中的成矿组分浸出,伴随再平衡岩浆充填交代成矿。研究结果可供五河地区寻找同类矿床参考。

The analysis of geological characteristics and metallogenic condition of a deposit is an important mean to discover similar deposits in the same area. On the basis of summarizing previous research results, this work discussed the geological characteristics, metallogenic conditions, ore-controlling factors and metallogenic model of the Wuhekou lead-gold deposit in detail. It is considered that the Archean metamorphic basement is both the ore-hosting horizon and original source rock series of this deposit, and the main ore-controlling factor is fracture, especially the NNE-NE-trending and NS-trending faults. The metallogenic model is assumed as follows. High-temperature mixed granitic magma melt was formed by deep melting and remelting of crustal material, which intruded into the upper crustal rocks. During the crystallization process, enriched gasified high-temperature initial mixed magma water rose to the condensed or subsolidified granitic rocks to be subjected to alkali metasomatism. As a result, ore-forming components leached from solidified rocks, associated with rebalanced magmatic water to fill and metasomatize to form ores. The research results can provide a basis for discovering similar deposits in the Wuhe area.