Abstract:Through analysis and study on previous information of granite tectonics, petrochemistry, isotope geochronology and other geological information of Guojialing group, it is regarded that granodiorite-granite of Guojialing group in Jiaodong area generally belongs to syntexis plutonic granites which were formed by differentiation after the mixture of mantle-derived magma and crustal magma. It was mainly formed by volcanic island arc environment, continental collision and back-arc extensional environment casued by the subduction of oceanic crust. Its positioning mechanism is as follows: small square to large square of squeezing belts with the trend of NNE frequency pulse type or magma swelling hot-air balloon expandable positioning. This combination body was formed in early Cretaceous. From the concept of rock combination, it is defined as the Guojialing weak gneissic granodiorite and granite combination in middle orogenic period.
