摘要
用淋滤浸取和溶解度法,在25—300℃饱和水蒸气压条件下,判明了该区萤石矿含F的矿源(岩)层是黑云母斜长片麻岩,且易溶F富集在蚀变的斜长石之中。F主要以CaF^+、MgF^+、NaF°形式进行迁移。酸性时有HF、HF_2^-、SiF_6^(2-)配离子存在。Ca与F可以同时迁移。还测定了该区萤石的溶度积。根据化学反应的酸碱变化,碳酸岩和基性围岩起到沉淀与净化萤石矿的双重作用。实验为该区萤石矿形成,建立了地球化学模式。
Experiments were carried out under 25-300℃ saturated water-vapor pressure conditions using the leaching extraction and solubility methods. The results provide strong evidence suggesting that the F-bearing source (rock) bed of fluorite ores in the Wuyi area, Zhejiang Province is a biotite-plagioclase gneiss. Soluble F is concentrated in the altered plagioclase and is transported mainly in the form of CaF + , MgF + and NaF0. In acidic solutions there exist ligand ions such as HF-, HF2- and SiF62-. Ca can be transported together with F. The solubility product of fluorite from this area has been determined. As viewed from the variation of pH in the chemical reactions, it is believed that the carbonate rock and its basic wall rock plays an important role in both precipitation and enrichment of fluorite ores. The experimental results provide the basis for the establishment of a geochemical model for the formation of fluorite ores.
出处
《地球化学》
CAS
CSCD
北大核心
1990年第1期21-31,共11页
Geochimica
