Na_2O或Na_2SiF_6影响硅酸盐熔浆粘度值的实验研究

本文通过不同的熔融温度下Na_2O或Na_2Si F_6影响硅酸盐熔浆粘度值的实验研究,分析了火山岩熔浆分异的机制,提出了富铁高钠质硅酸盐熔浆分异为富铁熔浆甚至硫铁矿“流”的可能性。这一论点合理地解释了云南大红山矿区Ⅱ富铁矿体的成因。

EXPERIMENTAL STUDY OF EFFECT OF Na_2O OR Na_2SiF_6 ON THE SILICATE MELT

The main object of the experiment is to test the effect of Na2O or Na2SiF6 on the viscosity of the silicate melt.The experiment shows that the viscosity of the silicate melt decreases with the increases of Na+ concentration. The higher temperature increases, the faster the viscosity decreases. The decrease in viscosity is also effected by volatility .Accompanying with the decreas in viscosity the behavior of differential layering in iron-rich alkaline silicate melt has been greatly facilitated and gives rise to an iron-rich silicate melt, or even a nearly pure magnetite flow.The result of the experiment provides an evidence for the origin of the No.2 ore body composed mostly of magnetite-hematite in Dahongsh-an mining area as it was formed through different stages of volcanic activity around an ancient volcano.