REE ANALYSIS METHOD AND APPLICATION-TAKING SOURCE ROCKS IN YONGAN REGION OF THE DONGYING SAG,THE BOHAI BAY BASIN AS EXAMPLE

With REE ICP-AES,based on analysis of REE in Yongan region of the Dongying Sag of the Bohai Bay Basin,REE distribution patterns of parent rocks(Ar,Pz,Mz) and sedimentary rocks(Es₄ and Es₃) are set up.Comparing REE distribution characteristics of parent rocks with sedimentary rocks,provenance of Es₄ and Es₃ in sedimentary region is analyzed.REE characteristics of Es₄ in sedimentary zone and Mesozoic and Lower Paleozoic in parent rock zone are the most similar.REE characteristics of the middle and lower Es₃ in sedimentary zone are similar with that of Mesozoic,Lower Paleozoic and Archaeozoic in parent rock zone.REE characteristics of the upper Es₃ are similar with that of Archaeozoic in parent rock zone.The above mentioned differences in REE distribution indicate different sources during Es₄ and Es₃ periods.