湖南界牌岭花岗斑岩的蚀变过程与稀有稀土金属成矿

林晓青, 饶灿, 覃莉茜, 吴润秋, 王琪

Alteration processes and rare (earth) metal mineralization of Jiepailing porphyry deposit, Hunan Province

Xiaoqing Lin, Can Rao, Lixi Qin, Runqiu Wu, Qi Wang

表3 界牌岭蚀变花岗斑岩中长石族矿物的电子探针化学成分代表性结果(wt.%)

Table 3 Representative electron microprobe chemical compositions of feldspar from the altered granite porphyry in Jiepailing (wt.%)

钾长石 钠长石 斑晶 基质 自形晶 微细粒 SiO2 66.28 64.78 65.66 66.46 65.98 68.16 67.57 68.28 Al2O3 17.63 18.16 18.06 18.34 17.93 19.95 19.23 19.30 K2O 15.92 15.81 16.18 15.16 15.15 0.86 0.71 0.12 Na2O 0.35 0.31 0.24 0.21 0.25 11.06 11.75 11.73 Rb2O 0.38 0.99 - 0.53 0.59 - BaO - - - - 0.11 0.01 0.09 0.02 MnO 0.05 - - 0.03 0.06 - 0.07 - MgO - 0.02 0.03 0.02 - 0.02 0.07 - TiO2 0.01 0.02 - 0.02 - - 0.03 - FeOT 0.01 - 0.00 - - 0.01 - 0.03 CaO - - - - - 0.11 0.02 - Total 100.63 100.10 100.17 100.77 100.07 100.16 99.53 99.49 以氧原子数n(O)=8计算 Si 3.040 3.006 3.030 3.019 3.036 3.170 2.983 3.176 Al 0.953 0.993 0.979 0.985 0.972 1.093 1.000 1.058 K 0.931 0.936 0.950 0.882 0.889 0.051 0.040 0.007 Na 0.031 0.028 0.022 0.018 0.022 0.997 1.006 1.058 Rb 0.011 0.029 0.016 0.017 Ba 0.000 0.002 0.002 Mn 0.002 0.001 0.002 0.003 Mg 0.002 0.002 0.001 0.001 0.004 Ti 0.001 0.001 0.001 Fe 0.001 Ca 0.006 0.001 Or 0.968 0.971 0.978 0.979 0.975 0.048 0.038 0.007 Ab 0.032 0.029 0.022 0.021 0.025 0.947 0.961 0.993 An 0.005 0.001