Characteristics of Pb Isotopic Composition in Upper Mantle Cenozoic for China Continent

301 Pb isotopic data of mantle-derived basalts for Cenozoic (contain few Late Mesozoic samples) were collected in this work.The variety trend (contour) maps of mantle Pb isotopic in China continent for Cenozoic were draw up systematically and the "variety trend of ²⁰⁶Pb/²⁰⁴Pb ratio of Cenozoic basalts derived from mantle in continent of China" is submitted in this paper only.The result shows that there is a difference between North China and South China on ²⁰⁶Pb/²⁰⁴Pb ratio.The geographic boundary between two regions is from Hefei-Zhengzhou-Yinchuan-Hantenggeli peak and the ²⁰⁶Pb/²⁰⁴Pb ratio boundary is believed to 18-18.5 approximately.The ²⁰⁶Pb/²⁰⁴Pb ratios in North China are < (18-18.5) and vice versa.Combining with Nd isotopic data, three mantle types can be identified, they are: mantle of orogenic belt; mantle of continental rifting; and mantle of non-typical region.The map of "variety trend of ²⁰⁶Pb/²⁰⁴Pb ratio of lithosphere in continental of China" is also showed in this paper.This is a comprehensive map, and compiled by the Pb isotopic data of samples which collected from different periods and different type of rocks.By comparison to these two maps, some differences and problems can be found such as: The values for ²⁰⁶Pb/²⁰⁴Pb ratio in northwestern of Northeast China; the intensity of Pb isotopic-anomaly in "Bohai basin"; whether the high-value area of Pb isotopic appears in 104°E and adjacent or not; a problem about DUPAL anomaly in South China.Based on the differences, the compositions of mantle at present-day did not inherit the total characteristics of lithosphere before and injects the new asthenospheric material.It is referred that a new mantle convection system appears in China continent for Late-Mesozoic-Cenozoic.However, the difference of ²⁰⁶Pb/²⁰⁴Pb ratio between North and South China still exist in both maps implying that the effect of subduction from Pacific slab for China continent is not very important.