Geochemical, geochronological, and Sr–Nd–Hf isotopic constraints on the petrogenesis of the Qicun intrusive complex from the Handan–Xingtai district: Implications for the mechanism of lithospheric thinning of the North China Craton

摘要: Abstract The Qicun intrusive complex is one of the major ore-related intrusions in Handan–Xingtai district, eastern North China Craton. It consists four bodies dominated by monzonite, quartz monzonitic diorite, and biotite respectively. diorite has a LA–ICP-MS zircon U–Pb age 128.9 ± 0.93 Ma, indicating its emplacement early Cretaceous when Craton was extensively reactivated. Rocks have high MgO (1.69–9.50 wt.%), La N /Yb (5.32–17.59) Sr/Y (18.05–101.10) ratios, with low Y (8.17–20.43 ppm) Yb (0.86–1.85 ppm) contents. They are enriched light rare earth elements (LREE) but depleted heavy (HREE) field strength (HFSE) weak or no positive Eu anomalies, features assembling adakites. In addition, whole-rock samples initial 87 Sr/ 86 Sr ratios ranging from 0.70663 to 0.70767 e Nd (t = 130 Ma) between − 16.5 − 14.3, which consistent 176 Hf/ 177 Hf 0.281739 0.282083 (t) values − 33.8 − 21.7. isotopic signatures, combined existing geological geochemical data, indicate that complex, inference other contemporaneous formed mixing mantle-derived magmas partial melts delaminated lower continental crust under lithospheric extensional setting related destruction Widespread presence inherited grains ca. 2.5–2.4 Ga contribution formation complex.