The characteristics of the chemical composition of the richalkali granite porphyries are poor in SiO2, with mean content of 6919%, but rich in alkali and high in potash. The mean content of (K2O+Na2O) is 985%. K2O is ...The characteristics of the chemical composition of the richalkali granite porphyries are poor in SiO2, with mean content of 6919%, but rich in alkali and high in potash. The mean content of (K2O+Na2O) is 985%. K2O is much greater than Na2O, mean value of K2O/Na2O is 210. As shown by the REE analysis, REE contents is lower. Compared with the granite of south China, the richalkali granite porphyry hase higher LREE, and no anomaly of europium (δEu=087). Its genetic type belongs to A type graritoid.展开更多
文摘The characteristics of the chemical composition of the richalkali granite porphyries are poor in SiO2, with mean content of 6919%, but rich in alkali and high in potash. The mean content of (K2O+Na2O) is 985%. K2O is much greater than Na2O, mean value of K2O/Na2O is 210. As shown by the REE analysis, REE contents is lower. Compared with the granite of south China, the richalkali granite porphyry hase higher LREE, and no anomaly of europium (δEu=087). Its genetic type belongs to A type graritoid.
