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笔者对小秦岭驾鹿构造蚀变岩型金矿的钾长石用红外光谱和X射线粉晶衍射法测定其结构态与平衡温度 ,结果如下 :钾长石为微斜长石 -最大微斜长石 ,Al的占位率t1(o) =0 .73～ 1.0 0 ,t1(m) =0 .2 6～ 0 ;t2 (o) =t2 (m) =0 .0 3～ 0 ;晶胞参数a0 =0 .8388～ 0 .86 11nm ,b0 =1.2 837～ 1.2 96 8nm ,c0 =0 .7156～ 0 .72 4 8nm ,α =89.90 6～ 91.0 93° ,β =115.6 50～ 116 .2 30° ,γ=87.50 0～ 89.994° ;三斜度Δ =0 .6 86～ 1.115;平衡温度t =50 3.51～ 578.35℃。因此 ,认为驾鹿钾长石是热液蚀变的产物 ,它调整结构所释放的热量对早期高温阶段的含金热液有影响 ,起着一种活化金络合物的作用 ,不利于金沉淀就位。随着钾长石平衡温度的降低和三斜度的升高 ,这种作用相对更加明显。
The author analyzed the structure and equilibrium temperature of potassium-feldspar in Qilu-deer tectonic altered rock gold ore by means of IR and X-ray powder diffraction. The results are as follows: K-feldspar is micro-plagioclase - Feldspar, Al occupancy rate t1 (o) = 0.73 ~ 1.0 0, t1 (m) = 0.26 ~ 0; t2 (o) = t2 (m) = 0.30 ~ Cell parameters a0 = 0.8388-0.886 11 nm, b0 = 1.2 837-1.2 96 8 nm, c0 = 0.7156-0.772 48 nm, α = 89.90 6-91.0 93 °, β = 115.6 50-116. 2 30 °, γ = 87.50 0-89.994 °; three slope Δ = 86.61-1115; and equilibrium temperature t = 50 3.51-587.35 ° C. Therefore, it is considered that KF feldspar is a product of hydrothermal alteration, and the heat released by its structural adjustment has an influence on the gold-bearing hydrothermal fluid in the early high temperature stage and plays a role of activating gold complex, which is unfavorable for gold Precipitation in place. This effect is relatively more pronounced as the equilibrium temperature of K-feldspar decreases and the trisection increases.