Reserch on Homology for the Rock Group of Monzonite Granite in the Western Qinling

The homology of the rock mass is analyzed according to the geology, petro-graphic andgeochemical along the rock group of adamellite in the western Qinling(commonly called as“Five golden flowers”).It shows that the invasion sequence is clear. The rock mass includes diorite in earlyphase,biotite adamellite in the metaphase,two-mica monzonitic granites in the late stage.The intrusion has an evolution trend from acidic to alkali with rock forming episode. In the space,the longitudinal lithology is consistent overall, and the structure become thinner from east to west;the transverse structure is similar and the composition is more partial acid to the south.The rock group from the old to the new,they are from the potassium and sodium transition area to potassium,belonging to shoshonitic series and high-K calc-alkaline series. They have similar geochemical features. The REE diagram of the Chondrite-normalized show that they are rich in LREE,and evidently depleted in Eu. The adamellite is formed at 181-232.9Ma (by Rb-Sr) and 178-248.8Ma (by K-Ar). Meanwhile, the value of the ANKC is lower than 1.1, with peraluminous granite. They are Himalayan-type granite. Research shows that the rock group of adamellite has homology.