Dalongshan A-type Granite:Petrology,Mineralogy,Geochemistry and Its Geological Significance

摘要

The Dalongshan A-type granite belongs to the Anlu (Anqing,Zongyang and Lujiang)A-type granite belt, the rocks of Dalongshan granite are mainly quartz syenite,syenite and alkaline-feldspar granite. Mineralogy,petrology and geochemistry features of this granite support the argument that Anlu A-type granites and Luzong shoshonite volcanic rocks belong to the same magma evolution series.And A-type granites do not represent ultrapotassic rocks.Compared to Luzong volcanic rocks,the A-type granites are the end of the shoshonitic magma association.