酸性流体作用下斜长石的稳定性

通过紫外分光光度计分析和扫描电镜观察,开展不同温度下酸性流体与斜长石相互作用实验得出:1在低温条件下斜长石较稳定,以溶解为主;在高温条件下,斜长石不稳定,以溶蚀、溶解为主;随反应温度升高,质量损失增大。2斜长石沿解理形成条带状溶孔,沿表面形成粒内溶孔。3在160℃和190℃条件下,形成新生高岭石沉淀,温度升高高岭石晶形变好,实验反应强度增大。4随反应温度升高,K+、SiO2和矿化度浓度升高。

Stability of plagioclase under acidic fluid action

The authors carried out interaction experiment of acid fluid with plagioclase under different temperatures，through the analysis of ultraviolet spectrophotometer and scanning electron microscope． The experiment showed that ①At low temperatures plagioclase is stable， which is marked by the ascendancy of dissolution; while at high temperatures，plagioclase is unstable，which gives priority to with corrosion，dissolution． As the reaction temperatures rise，the mass losses increase． ②Plagioclase formed belt solution pores along cleavages，the surface came into being intragranular dissolved pores． ③At 160℃ and 190℃，the secondary kaolinite precipitation formed，as temperatures rise kaolinite crystalline form becomes good， experimental reaction intensity increases． ④ With the reaction temperature rise，the concentrations of K+ ，SiO2 and salinity increase．