This paper reports new zircon U–Pb ages, whole-rock geochemistry, and Sr–Nd–Pb–Hf–O isotopic compositions for the Funiushan (FNS) pluton of the southern North China Craton (NCC). These data and statistical analyses of previously reported compositions of late Mesozoic granites from the southern NCC are used to constrain late Mesozoic continental recycling and geodynamic processes. The FNS pluton includes coexisting early Early Cretaceous (140 Ma), late Early Cretaceous (130–116 Ma) and highly evolved granites (HEGs; 126–125 Ma). The early Early Cretaceous granites have high Sr contents (332–566 ppm), high Sr/Y (53–138) and (La/Yb)_N (29–52) ratios, and low MgO contents (0.15–0.48 wt%). They have relatively low (⁸⁷Sr/⁸⁶Sr)_i values (0.7051–0.7054), relatively high ε_Nd(t) values (−4.11 to −3.96) and variable ε_Hf(t) values (−22.9 to −0.53). They are also characterized by high initial ²⁰⁶Pb/²⁰⁴Pb values (17.893–17.975) and relatively low δ¹⁸O values (5.34‰–7.48‰) as well as Neoproterozoic (851–734 Ma) inherited zircons, suggesting that they have an adakitic affinity formed by recycling of subducted continental crust of the Yangtze Craton (YC) with input from a mantle component. In contrast, the late Early Cretaceous granites have relatively high (⁸⁷Sr/⁸⁶Sr)_i values (0.7077–0.7085), low ε_Nd(t) values (−14.2 to −12.0), relatively high initial ²⁰⁶Pb/²⁰⁴Pb values (17.398–17.497), ε_Hf(t) values of −23.7 to −10.7, and δ¹⁸O values of 5.76‰–6.55‰. These data, and the Neoproterozoic zircon ages (716–702 Ma), indicate that the primary magmas formed from recycled YC crust with a minor contribution from the NCC basement. The late Early Cretaceous HEGs have relatively high ε_Nd(t) values (−9.33 to −8.70), high initial ²⁰⁶Pb/²⁰⁴Pb values (17.656–17.885), intermediate ε_Hf(t) values (−12.3 to −6.18), and relatively low δ¹⁸O values (5.22‰–6.72‰), indicating that they formed from subducted YC and mantle material. Previous work on granites of the southern NCC has established two phases of granite formation. Late Jurassic to early Early Cretaceous I-type granites (160–130 Ma) occur throughout the southern NCC. These are adakitic and formed from thickened lower continental crust (LCC). Late Early Cretaceous A-type granites (130–110 Ma) formed from thinned LCC. The differences between Late Jurassic to early Early Cretaceous granites and late Early Cretaceous granites reflect a transformation in tectonic regime from thickening to thinning, which is attributed to rollback of the subducting Paleo-Pacific Plate.

本文报告了华北克拉通南部 (NCC) 伏牛山 (FNS) 岩体的新锆石 U-Pb 年龄、全岩地球化学和 Sr-Nd-Pb-Hf-O 同位素组成。这些数据和先前报告的 NCC 南部晚中生代花岗岩成分的统计分析用于限制晚中生代大陆再循环和地球动力学过程。FNS 岩体包括共存早白垩世 (140 Ma)、晚早白垩世 (130-116 Ma) 和高度演化的花岗岩 (HEGs; 126-125 Ma)。早白垩世早期花岗岩具有高 Sr 含量 (332–566 ppm)、高 Sr/Y (53–138) 和 (La/Yb) _N (29–52) 比率，以及低 MgO 含量 (0.15–0.48 wt%) . 它们具有相对较低的 ( ⁸⁷ Sr/ ⁸⁶ Sr) _i值 (0.7051–0.7054)、相对较高的 ε _Nd ( t ) 值（-4.11 至 -3.96）和可变的 ε _Hf ( t ) 值（-22.9 至 -0.53）。它们还具有较高的初始²⁰⁶ Pb/ ²⁰⁴ Pb 值 (17.893–17.975) 和相对较低的 δ ¹⁸ O 值 (5.34‰–7.48‰) 以及新元古代 (851–734 Ma) 遗传锆石的特征，表明它们具有由扬子克拉通 (YC) 俯冲大陆地壳再循环与地幔成分输入形成的埃达克亲合力。相比之下，早白垩世晚期花岗岩具有较高的 ( ⁸⁷ Sr/ ⁸⁶ Sr) _i值 (0.7077–0.7085)，低 ε _Nd( t ) 值（-14.2 至 -12.0），相对较高的初始²⁰⁶ Pb/ ²⁰⁴ Pb 值（17.398-17.497），ε _Hf ( t ) 值为 -23.7 至 -10.7，δ ¹⁸ O 值为 5.76‰–6.55 ‰。这些数据和新元古代锆石年龄（716-702 Ma）表明，原生岩浆由再生的 YC 地壳形成，而 NCC 基底的贡献较小。晚早白垩世 HEG 具有相对较高的 ε _Nd ( t ) 值（-9.33 至 -8.70），高初始²⁰⁶ Pb/ ²⁰⁴ Pb 值（17.656-17.885），中间 ε _Hf ( t ) 值（-12.3 至 -6.18） , 和相对较低的 δ¹⁸ O 值 (5.22‰–6.72‰)，表明它们由俯冲的 YC 和地幔物质形成。以前对 NCC 南部花岗岩的研究已经确定了花岗岩形成的两个阶段。晚侏罗世至早白垩世早期 I 型花岗岩（160-130 Ma）遍布整个华北克拉通南部。它们是埃达克岩，由加厚的下大陆地壳 (LCC) 形成。由减薄的 LCC 形成的晚早白垩世 A 型花岗岩（130-110 Ma）。晚侏罗世至早白垩世花岗岩与晚早白垩世花岗岩之间的差异反映了由俯冲古太平洋板块回滚引起的构造体制由增厚向减薄的转变。