Abstract The appearance of voluminous K-rich granitoids within nearly all ancient cratons represents one major characteristic of late Archean Earth, which hold the key to understand the transitional geodynamic regimes globally during this period. The genetic regimes and links among different K-rich granitoids and their implications for crustal growth and evolution remain controversial. A series of late Neoarchean K-rich granitoids, including quartz dioritic, granodioritic, and monzogranitic gneisses, occur in the Jiaobei terrane of North China Craton. Zircon U-Pb isotopic data reveal that they emplaced during ~2544–2494 Ma, coeval with regional ~2530–2470 Ma high-grade metamorphism. The quartz dioritic-granodioritic gneisses are magnesian rocks, and they show low Si and Ti, but high K and Mg, similar to Archean low-Ti sanukitoids. The Sr/Y and (La/Yb)N are high (mostly 59.99–119.32 and 8.56–61.42), with moderate to high Nb (up to 11.79 ppm). Geochemical modeling, combined with depleted zircon eHf(t2) (+0.5 − +7.2) and the presence of minor xenocrystic zircons, indicate that these low silica samples were derived from a metasomatized depleted mantle source with inputs of slab-derived fluids and melts, and minor contamination by ancient crustal materials. The monzogranitic rocks are ferroan rocks showing high Si, K, and Fe, but low Mg. They are divided into two subgroups: the first displays low TREE of 44.00–127.00 ppm and positive Eu anomalies (EuN/Eu*N = 1.06–1.60), whereas the second shows high TREE of 85.76–819.02 ppm but negative Eu anomalies (EuN/Eu*N = 0.51–0.62). Geochemical modeling and depleted zircon eHf(t2) of +2.6 − +8.4 suggest their formation by partial melting of juvenile crustal sources involving tonalitic and some metasedimentary rocks at diverse crustal levels. Combined with regional geological data, these late Neoarchean K-rich granitoids were generated by coupled melting of metasomatized depleted mantle and dominantly juvenile crustal materials during crustal stabilization. Furthermore, the Jiaobei terrane experienced ~2.6–2.5 Ga crustal growth under a subduction-accretion setting.

中文翻译：

---

华北克拉通胶北地体俯冲相关壳幔相互作用产生的晚新太古代富钾花岗岩的多样性

摘要 几乎所有古代克拉通中大量富钾花岗岩的出现代表了太古代地球晚期的一个主要特征，是了解这一时期全球过渡地球动力学制度的关键。不同富钾花岗岩之间的遗传机制和联系及其对地壳生长和演化的影响仍然存在争议。华北克拉通胶北地体发育一系列晚新太古代富钾花岗岩，包括石英闪长岩、花岗闪长岩和二长花岗岩片麻岩。锆石 U-Pb 同位素数据显示它们在~2544-2494 Ma 期间就位，与区域~2530-2470 Ma 高级变质作用同时期。石英闪长-花岗闪长片麻岩为镁质岩，Si、Ti低，K、Mg高，类似于太古代低钛sanukitoids。Sr/Y 和 (La/Yb)N 很高（主要是 59.99-119.32 和 8.56-61.42），Nb 中等至高（高达 11.79 ppm）。地球化学模型，结合贫化锆石 eHf(t2) (+0.5 - +7.2) 和少量异晶锆石的存在，表明这些低二氧化硅样品来自交代枯竭的地幔源，输入了板片衍生的流体和熔体，受古代地壳物质的轻微污染。二长花岗岩是铁质岩石，Si、K 和 Fe 含量高，但 Mg 含量低。它们分为两个子组：第一个显示 44.00-127.00 ppm 的低 TREE 和正 Eu 异常（EuN/Eu*N = 1.06-1.60），而第二个显示 85.76-819.02 ppm 的高 TREE 但负 Eu 异常（EuN /Eu*N = 0.51–0.62）。地球化学模型和贫化锆石 eHf(t2) 为 +2.6 - +8。图 4 表明它们的形成是由年轻地壳源的部分熔融形成的，这些地壳源涉及不同地壳水平的变质沉积岩和一些变质沉积岩。结合区域地质资料，这些晚新太古代富钾花岗岩是地壳稳定过程中交代枯竭地幔和占主导地位的新生地壳物质的耦合熔融产生的。此外，胶北地体在俯冲-增生环境下经历了~2.6-2.5 Ga 地壳生长。