南平花岗伟晶岩中的磷酸盐矿物及地球化学演化规律

Phosphate Minerals and Their Geochemical Evolution of Granitic pegmatite in Nanping, Fujian Province

磷酸盐矿物是稀有金属花岗伟晶岩中最复杂的一组矿物，在中国以南平伟晶岩最为发育，目前已发现至少２２种磷酸盐矿物，其中属我国首次发现的有１４种。这些磷酸盐矿物分别形成于伟晶岩的原始花岗质岩浆结晶分异阶段和残余流体相对已结晶主体进行蚀变交代阶段。早期阶段以矿物数量众多为特征，而晚期则以磷酸盐矿物种类复杂、演化周期长而在国内独树一帜，深入研究这些磷酸盐矿物，对探讨稀有金属花岗伟晶岩的发育历史具有重要意义。

The phosphate minerals is the most complex one in the granitic pegmatite with rare metal mineralization. In China,the granitic pegmatite in the Nanping area has more phosphate minerals. Up to now,22 species of phosphate minerals have been discovered,including 14 species of phosphates which were first reported in China. There phosphate minerals were formed in the crystallization differentiation stage of initial granitic magma and in the emplacement of a residual fluid of magma to the wall rocks. The early stage is characterized by a great number of the phosphate minearals and the phosphate minerals formed in the late sarge are very complex and have a long evolutional history, which is found in the Nanping granitic pegmatite. These phosphate minerals have been studied in detail, which is of signification to the discussion of the evolutional history of granitic pegmatite with rare metals.