THE MAPPING OF GEOCHEMICAL PROVINCES IN CHINA BASED ON PB ISOTOPES

The comparison of Pb isotopic compositions for Various ores and rocks has revealed that the lateral variation between different terranes is greater than the vertical variation between crust and mantle, which is useful for geochemical mapping. Based on a three dimensional topologi cal diagram of ph isotopes, six geochemical provinces can be recognize d in China, namely southern China, Yangtze, northern China, northern X injiang, Jiamusi and Tibet. The application of Pb isotopes to regional mapping provides important background data for geochemical prospectin g as it establishes the tectonic boundaries of terranes and identifies the source regions of mineralization, magmatism and sedimentation. It also provides information on the origin of pollution and cultural rel ies.