湖南香花岭矿区稀有金属分布特征和成矿模式

Distribution characteristics and mineralization models of rare metals in Xianghualing ore district of Hunan

为了进一步在香花岭地区寻找稀有金属资源靶区,对尖峰岭岩体和香花铺岩体稀有金属分布特征和富集规律进行了研究。尖峰岭稀有金属的矿化富集主要集中在黑云母花岗岩体顶部及边部云英岩化带,其中Nb Ta含量相对较高;而香花铺黑云母花岗岩Nb Ta氧化物含量(95.3×10^(-6)~349×10^(-6))高于尖峰岭岩体(108.7×10^(-6));Li含量在云英岩(1 320×10^(-6)、9 672×10^(-6))和硅化砂岩(4 340×10^(-6))的也远高于同矿区的黑云母花岗岩(884×10^(-6)),表现出良好的矿化趋势。根据稀有金属分布规律和成矿地质条件,提出了该地区稀有金属成矿3个阶段模式,该矿区稀有金属找矿标志为云英岩化、钾长石化、钠长石化等蚀变作用带,最终圈定重要的稀有金属成矿部位为花岗岩顶部和边缘接触带。

In order to further search for rare metal target resources,the distribution characteristics and enrichment regularity of rare metals of Jianfengling granite pluton and Xianghuapu area are studied in this paper. Rare metal mineralization enrichment in Jianfengling mainly exists on the top and the greisenization boundary zone of the biotite granite body,and the Nb Ta content is relatively higher than other rare metal elements in Jianfengling. The Nb Ta oxide（ 95. 3 × 10^（-6）- 349 × 10^（-6）） content in Xianghuapu biotite granite is higher than that of the Jianfengling pluton（ 108. 7 × 10^（-6））,and the Li content of the greisen（ 1 320 × 10^（-6）and 9 672 × 10^（-6））and silicified sandstone（ 4 340 × 10^（-6）） is much higher than that of the biotite granite（ 884 × 10^（-6）） in the same area,showing a good trend of mineralization. Based on the distribution regularity and ore-forming geological conditions of rare metals,the rare metal mineralization model of three stages is suggested. It is also pointed out that the prospecting signs of rare metal in the deposit should be the alteration zones including greisenization,potassium feldspathization,and albitization. The important rare metal mineralization prospecting sites should be on the top and at the edge of the contact zone of the granite bodies.