Abstract:In this paper, we report the geochronology, major and trace element geochemistry and SrNdHf isotope data for the early Cretaceous volcanic rocks of the Qingshan Group in the Linqu area, with an objective to constrain the petrogenesis. The volcanic rocks are mainly intermediate rocks, with a SiO2 content varying between 5441%~6781%. Rock association consists mainly of andesite, trachyandesite, trachyte and trachydacite. These volcanic rocks belong to calcalkaline series. Zircon LAICPMS UPb dating yields an age of 1213 ± 15 Ma for trachyandesite, indicating that the rocks crystallized in Early Cretaceous. The rocks are geochemically characterized by enrichment of LREE and LILE (e g, Rb, Ba, K), and depletion of HFSE (e g, Nb, Ta, Ti). These volcanic rocks have enriched SrNd isotopic compositions ((87Sr/86Sr)t=0704346~0705831, εNd(t)=-146~-95), and have low Hf isotopic composition (εHf(t)=-293~-216). The rocks have the similar Mg# values as the melts produced by metabasite, with large range of Cr (267×10-6~239×10-6) and Ni (10×10-6 ~697×10-6) content, and show significant mineral textural disequilibrium. The study further indicates that the Linqu volcanic rocks of the Qingshan Group may be the product of magma mixing between lower crustderived melts of ancient North China Craton and mantlederived melts of enriched mantle under the lithospheric extension setting.