安徽五河地区河口铅金矿成矿地质条件及成矿模式
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摘要
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.
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.
引文
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朱琨,2017. 解析安徽省蚌埠—五河地区与胶东地区金矿床成矿地质背景对比[J]. 资源信息工程,32(2):25-26.
张顺林,张家嘉,汪青松,等,2017a. 安徽省五河县荣渡—大柳庄地区河口铅金矿普查地质报告[R]. 合肥:安徽省勘查技术院.
张顺林,汪青松,张家嘉,等,2017b. 五河地区与胶东及小秦岭地区金矿成矿地质对比研究[J]. 安徽地质,27(2):90-94.
董法先,李中坚,陈柏林,等,1993. 安徽省五河县大巩山—荣渡地区金矿控矿构造和找矿方向[R]. 北京:地质矿产部地质力学研究所.
胡海风,徐晓春,陈芳,等,2015. 安徽蚌埠—五河地区与胶东地区金矿床成矿地质背景对比研究[J]. 地质学刊,39(2):187-193.
黄江华,敬海霞,葛旭,等,2015. 安徽省五河地区金矿地质特征及成因探讨[J]. 安徽地质,25(4):258-260.
王小凤,李中坚,陈柏林,等,2000. 郯庐断裂带[M]. 北京:地质出版社.
张立明,黄臣相,2012. 安徽蚌埠—五河地区五河岩群地质特征及其时代浅析[J]. 安徽地质,22(1):9-11.
张家嘉,罗明光,2013. 五河县大巩山地区褶皱构造浅析[J]. 安徽地质,23(4):253-255.
朱义坤,汪青松,张家嘉,等,2016. 安徽省五河地区金矿成矿条件调查评价报告[R]. 合肥:安徽省勘查技术院.
朱琨,2017. 解析安徽省蚌埠—五河地区与胶东地区金矿床成矿地质背景对比[J]. 资源信息工程,32(2):25-26.
张顺林,张家嘉,汪青松,等,2017a. 安徽省五河县荣渡—大柳庄地区河口铅金矿普查地质报告[R]. 合肥:安徽省勘查技术院.
张顺林,汪青松,张家嘉,等,2017b. 五河地区与胶东及小秦岭地区金矿成矿地质对比研究[J]. 安徽地质,27(2):90-94.