关键词: 煌斑岩, 幔源, 混染, 成矿作用, 贵金属

Abstract: The analysis on the geochemical characteristics of the lamprophyre that is closely related with the metal deposit in the provincial border areas around Guangdong and Guangxi province，showed that Rb，Ce and Sm are relative enriched，while Ta and Sr are relatively loss，based on the N-MORB standardized spider diagram of trace elements.The ΣREE values of lamprophyre are（82.33~215.30)×10^-6，and its average values are 143.20 × 10^-6，which is the 20 times that of the original mantle.The contents of LREE and HREE are（75.01~199.01)× 10^-6 and（7.31~16.29)× 10^-6 respectively，the LREE/HREE value between 9.26~12.22 and the average value is 10.90.The REE distribution curves showed as right deviation and extremely weak Eu anomaly，after normalized by the chondrite.The lamprophyre in research area has the characteristics of both mantle and lower crust，the values of mantle-derived geochemical indicators δZr/δNb and δTh/δLa are 16.02~20.01 and 0.14~0.20 respectively，the crust source composition include δLa/δNb，δSm/δNd and δNb/δU with the values of 2.06~3.78，0.18~0.19 and 5.29~22.37 respectively.It maybe indicate that，lamprophyre is the product of the original mantle-derived magma that is contaminated by the lower crust materials.During the process of the precious metal mineralization in research areas，lamprophyre maybe plays the roles of “mineralizer source” and “energy donor”.

Key words: Lamprophyre, Mantle source, Contamination, Mineralization, Precious metal