图1 根据火山岩实际矿物含量的QAPF分类图解[2] Q.石英;A.碱性长石;P.斜长石;F.副长石

Fig.1 QAPF classification diagram based on the actual minerals of volcanic rocks[2]

图2 火山岩(Na2O+K2O)-SiO2图解(TAS)的化学分类和命名[4]

Fig.2 Chemical classification and nomenclature of (Na2O+K2O)-SiO2 diagram (TAS) for volcanic rocks [4]

图3 Zr/TiO2-Nb/Y图解((a)不同火山岩在Winchester和 Floyd图解中的范围[1];(b)根据数据的密度边界拟合出的新的边界; (c)改进前后边界对比(据文献[5]))

Fig.3 Zr/TiO2-Nb/Y diagram ((a) Distribution range of different volcanic rocks in the Winchester and Floyd’s diagram[1]; (b) A new boundary fitted based on the density boundary of the data; (c) A comparison between the boundaries in the original and improved diagram (according to ref. [5]))

图4 随机森林分类岩石类型的准确率[5] (最后一行的准确率来自交叉验证得到的训练集准确率)

Fig.4 Accuracy of rock type identification by random forest method[5] (The accuracy by Random Forest Algorithm in the last line is the result of cross-validation of Random Forest in training stage)

图5 碱性和亚碱性系列以及过碱性和碱性-亚碱性系列在TAS图解((a), (c)和Zr/TiO2-Nb/Y图解(b), (d)中的投点[5]((a)图中碱性和亚碱性系列的I和 II边界(据文献[7-8]))

Fig. 5 Alkaline versus sub-alkaline samples and peralkaline versus alkaline-subalkaline samples plotted in TAS (a), (c) and Zr/TiO2-Nb/Y diagram (b), (d) (Boundaries I and II in (a) are from refs.[7] and [8], respectively)