Comparison of results analyzed by Chinese and European laboratories for FOREGS geochemical baselines mapping samples

<正>Geochemical subsoil data obtained from China and European laboratories have been compared in this study.787 C horizon subsoil samples from FOREGS（Forum of European Geological Surveys） geochemical baselines mapping project were sent to China's IGGE（Institute of Geophysical and Geochemical Exploration） laboratory and composited to 190 samples according to the 160 km×160 km GNT（Global Terrestrial Network） cells.In addition to the FOREGS elemental analysis package,Au.Pt,Pd,B,Ge,Br,Cl,Se,N,Li and F were also analyzed by using the IGGE's 76 element analytical scheme.Geochemical data statistics,scatter plotting,and geochemical map compilation techniques have been employed to investigate differences between FOREGS and IGGE analytical results. The results of two datasets.the IGGE's analysis data for composited samples,and the FOREGS average data of samples in each GNT cell,agree extremely well for about 23 elements,viz:SiO2,Sr, Al2O3,Zr,Ba,Fe2O3,Ti,Rb,Mn,Gd,CaO,Ga,MgO,P,Pb,Na2O,Y,Th,As,U Sc.Cr.and Co.There are slight differences between-laboratory biases shown as proportional errors between the datasets for Ni, K2O,Tb,Tl,Cu,S,Sm,La,Ce,Pr,Nd,Eu,Ho,Er,Tm,Yb,Lu,Ta,Nb,Hf,and Dy,For Cd,Cs,Be,Sb, In.Mo,I,Sn.and Te,the correlation of the two datasets and the similarity of the geochemical maps are fairly good,but obvious biases exist between the two datasets at values near detection limits.