The Precambrian intrusive rocks in the west Shandong region consist of the late Archaean Taishanian TTG granites and the metadioritoid complex, and the early Proterozoic Aolaishanian monzogranites and potassiumfeldspar granites, which cover an outcrop area accounting for 90 percent of the basement metamorphic rocks and intruded into the Taishan Group. TTG granites yield isotopic ages of 2700—2586 Ma with relatively high Na/K and low ~(87)Sr/~(86)Sr ratios. They show gneissic structure and LREE-enriched pact...