安徽马头斑岩型钼铜矿床蚀变带常量元素迁移规律及其定量计算

文章对安徽马头斑岩型钼铜矿床花岗闪长斑岩体和粉砂岩在矿化蚀变过程中常量元素的迁移规律进行了探讨。马头矿床元素质量迁移计算结果表明，在钼铜矿化蚀变过程中常量元素均发生不同程度的带入带出，迁移规律明显。在花岗闪长斑岩中，从钾化带、绢英岩化带到青磐岩化带，均为带入的常量元素有K₂O、CaO、SiO₂、H₂O⁺，而Na₂O明显带出，说明矿化与去钠化、钾长石化等蚀变密切相关。在粉砂岩中，蚀变岩明显带出的有Na₂O、CaO、MgO、Fe₂O₃、H₂O⁺等，而且黄铁辉钼矿化粉砂岩在常量元素的迁移程度远比青磐岩化粉砂岩大。马头矿床成矿系统质量变化定量计算结果表明，花岗闪长斑岩和粉砂岩系统的质量变化整体上表现为净带入与净带出，且净带出量大于净带入量，因此马头矿床成矿系统总体上是净带出的，即马头矿床钼铜矿化产出在元素总体负异常体系中。该项研究成果为揭示矿化蚀变过程中元素的作用机制提供了线索，并且可能成为深部成矿潜力定量评价的有效途径之一。

Major elements migration regularity and mass change quantification of alteration zones in Matou porphyry Mo-Cu deposit, Anhui Province

This paper investigated the migration regularity of major elements in the process of mineralized alteration for granodiorite porphyry and siltstone in the Matou porphyry Mo-Cu deposit of Anhui Province. The calculations of element mass migration show that the major elements experienced gains and losses in various degrees, and the migration regularity was obvious in the processes of Mo-Cu mineralized alteration. In granodiorite porphyry, from potash alteration zone, sericitization zone to propylitization zone, the major elements showed gains of K₂O, CaO, SiO₂, H₂O⁺; and the obvious loss of Na₂O, indicating that mineralization was closely associated with de-albitization and K feldspathization. In siltstone, altered rocks were obviously depleted in Na₂O, CaO, MgO, Fe₂O₃, H₂O⁺, and the migration quantity of major elements in pyrite-molybdenum mineralization siltstone was larger than that in propylitization. Metallogenic system quantitative calculation results show that the quality change of the system of granodiorite porphyry and siltstone did not increase or decrease on the whole, and the amount of gain is higher that of loss. It is held that it was purely gained in the whole metallogenic system and the mineralization of Mo-Cu was included in a negative anomalous system. The results obtained by the authors can provide evidence for quantitative evaluation of the prospecting potential of deep deposits, and may become a effective way for quantified evaluation of potential deep mineralization.