Abstract:
The early Cretaceous magmatism is an ideal window for studying the mechanism of North China Craton destruction, but the research in its central area is obviously shallow. This paper studied zircon U-Pb dating and geochemical characteristics of the Gufengshan granite pluton. The results show that the granite pluton is mainly composed of quartz monzodiorite. The weighted average age is (133.0±0.5) Ma, suggesting that it was emplaced in the early stage of the Early Cretaceous. The geochemistry indicates that it is characterized with medium total alkali content(K
2O+Na
2O=7.11%~7.40%), Na richness (Na
2O =4.17%~4.38%), and metaluminous rock (A/CNK=0.80~0.97), belonging to the high-K calc-alkaline I-type series. It is also characterized with the enrichment of large ion lithophile elements (Rb, Ba, K) and Th, depletion in high field-strength elements (Ta, Nb, P and Ti), medium rare earth element contents (ΣREE= (152.76~199.85)×10
−6), and weak negative Eu anomalies (
δEu=0.93~0.97), which is geochemically similar to the continental crust composition. Combined with local geological setting and research findings this time, it indicated that the orogenesis of Gufengshan granite pluton was related to the tectonic influence of the North China Craton’s destruction on its central area.