The Early Cretaceous igneous complexes in the north flank of the North China Craton (NCC) provide a window to investigate the Mesozoic magmatism in the NCC. Here we report the precise timing of Early Cretaceous magmatism and magma petrogenesis of the different rock types in the north flank of the NCC based on petrology, mineral chemistry, geochemistry, zircon geochronology and Sr-Nd isotopes. Zircon U-Pb dating reveals that the Shouwangfen complex was crystallized at 130–128 Ma. The rocks display enrichment in large ion lithophile elements (LILE) and LREE, and depletion in high field strength elements (HFSE) and HREE, with relatively high Sr/Y and La/Yb values, typical of subduction-related magmatic rocks. The mafic microgranular enclaves show typical igneous textures, acicular apatites, sieve-texture of plagioclase phenocrysts and overgrowth of amphibole around the pyroxene, corresponding to magma mixing and mingling and thermal exchange. The quartz monzonites display normal zoning of the plagioclase, low and homogeneous εNd(t) values and linear co-variations in two-component diagrams. The quartz monzodiorites are characterized by high and homogeneous εNd(t) values. Petrologic feature and geochemical data suggest that the quartz monzonites represent lower crustal magma with minor contribution of enriched melt of the sub-continental lithospheric mantle (SCLM), followed by fractional crystallization. The mafic microgranular enclaves were sourced from enriched SCLM, followed by mixing and mingling with the host quartz monzonitic magma. The quartz monzodiorites are mainly SCLM-derived and subsequently mixed with lower crust melts. The high water contents (≥3%) of these Early Cretaceous igneous complexes suggests a hydrous SCLM beneath the NCC. The Early Cretaceous igneous complexes formed within an extensional tectonic setting which were related to the retreat and dehydration of the paleo-Pacific slab. The hydration of the lithosphere induced extensive crust-mantle interaction and large-scale water-rich magmatism, leading to lithospheric thinning in the NCC during the Mesozoic.

华北克拉通（NCC）北侧的早白垩世火成岩复合体为研究NCC中生代岩浆作用提供了一个窗口。在这里，我们根据岩石学，矿物化学，地球化学，锆石年代学和Sr-Nd同位素，报告了NCC北侧不同类型岩石的早白垩纪岩浆作用和岩浆成岩的确切时间。锆石U-Pb测年表明，寿王粉复合物在130-128 Ma处结晶。岩石表现出大型离子亲石元素（LILE）和LREE的富集，以及高场强元素（HFSE）和HREE的耗竭，具有相对较高的Sr / Y和La / Yb值，这是俯冲相关岩浆岩的典型特征。镁铁质微颗粒飞地表现出典型的火成质地，针状磷灰石，斜长石伏晶的筛网结构和辉石周围闪石的过度生长，对应于岩浆混合，混合和热交换。石英蒙脱石显示斜长石的正常分区，低而均质ε钕（吨）在双组分图表值和线性共同变化。石英monzodiorites的特征在于高且均匀的ε的Nd（吨）值。岩石学特征和地球化学数据表明，石英蒙脱石代表下地壳岩浆，次大陆岩石圈地幔（SCLM）富集熔体的贡献较小，然后进行分步结晶。镁铁质微颗粒飞地取自富集的SCLM，然后与基质石英单核岩浆混合并混合。石英单闪闪石主要是SCLM衍生的，随后与较低的地壳熔体混合。这些早白垩世火成岩复合物中的高水含量（≥3％）表明NCC下方为含水的SCLM。白垩纪早期火成岩复合体在伸展构造背景下形成，与古太平洋板块的退缩和脱水有关。