皖南燕山期早阶段花岗闪长岩和晚阶段正长花岗岩的稀有金属成矿潜力对比

Comparison of Mineralization Potential of Rare Metals between Early Yanshanian Granodiorite and Late Ordovician Syenite in Southern Anhui Province

皖南燕山期花岗岩可分为早阶段(152-137Ma)和晚阶段(136-122Ma),早阶段岩性主要为花岗闪长岩,晚阶段岩性主要为正长花岗岩。本文通过对皖南燕山期两期花岗岩的分析,发现两期花岗岩在稀有金属含量特征上表现出较大的差异性:两阶段花岗岩的Li、Cs含量大致相当,而晚阶段正长花岗岩的Be、Nb、Rb、Zr、Hf、Ta含量要高于早阶段花岗闪长岩,其中Rb相当于早阶段的两倍,因此晚阶段正长花岗岩相比早阶段花岗闪长岩成矿潜力更高。

The Yanshanian granites in southern Anhui can be divided into early stage (152-137Ma) and late stage (136- 122Ma). The early stage lithology is mainly granodiorite, and the late stage lithology is mainly syenite granite. Based on the analysis of the Yanshanian two-stage granite in southern Anhui Province, it is found that the two-stage granite shows a large difference in the characteristics of rare metal: the Li and Cs content of the two-stage granite is roughly equal, while the content of Be, Nb, Rb, Zr, Hf and Ta in the late-stage syenogranite is higher than that in the early stage granodiorite., and Rb is equivalent to twice the early stage. Therefore, the later stage syenogranite has greater mineralization potential than the early stage granodiorite.