Forming Ages of Early Precambrian Metamorphic Strata in Shandong Province——Proofs of Zircon SHRIMP U-Pb Dating
wang shi-jin1; wan yu-sheng2; zhang cheng-ji3; yang en-xiu1; song zhi-yong1; wang li-fa1; wang jin-guang1(1.shandong geological surveying institute; shandong jinan 250013; china; 2.geological institute of chinese academy of geological sciences; beijing 100037; china; 3.shandong exploration bureau of geology and mineral resources; shandong jinan 250013; china)