Subduction-related shoshonitic and calc-alkaline plutons coexisted in the Paleoproterozoic Khondalite belt (North China Craton). They intruded at 1.97–1.96 Ga and were overprinted by 1.94–1.92 Ga high-temperature metamorphism. The mafic to intermediate (SiO₂ = 51.8–55.5 wt%) Wudangzhao shoshonitic metamonzodiorite has high K₂O (3.0–4.9 wt%) contents. In contrast, the mafic (SiO₂ = 48.5–51.7 wt%) Yebaigou metagabbro is sodium-rich (Na₂O/K₂O > 2). In Harker diagrams, the two intrusions show different magmatic evolution trends for selected major and trace elements, suggesting that they belong to two distinct magma series. Both intrusions are enriched in light rare earth element and depleted in high field strength elements, such as Nb, Ta, and Zr, in the trace-element diagrams normalized to the primitive mantle. The low ε_{Nd 1960 Ma} values (− 3.1 to + 0.6) of whole-rock samples, the low ε_Hf(t) values (− 2.2 to + 0.9) of magmatic zircon samples, and the relatively high δ¹⁸O values (+ 5.9 to + 6.4‰) of zircon crystals indicate that the mantle source of both intrusions had been metasomatized by fluids/melts derived from subducted continental crustal material. Partial melting of the amphibole and/or phlogopite-bearing mantle yielded the calc-alkaline melt with the chemical fingerprint characteristic for the Yebaigou metagabbro. Small-volume partial melting of a similar mantle source at greater depth produced shoshonitic melts that formed the Wudangzhao metamonzodiorites. The Wudangzhao metamonzodiorites and Yebaigou metagabbros represent part of a Paleoproterozoic continental magmatic arc on an Archean basement. This study shows that shoshonitic and calc-alkaline magmatism may exist coevally above ancient subduction zones and, thus, could provide some clues for distinguishing upper and lower plates in deeply eroded ancient collisional belts.

在古元古代孔达岩带（华北克拉通）中，与俯冲相关的橄榄岩和钙碱性岩体共存。它们以 1.97-1.96 Ga 侵入并被 1.94-1.92 Ga 高温变质作用叠印。镁铁质到中间体 (SiO ₂  = 51.8–55.5 wt%) 武当昭钾长钾长闪长岩具有高 K ₂ O (3.0–4.9 wt%) 含量。相比之下，镁铁质（SiO ₂  = 48.5–51.7 wt%）叶白沟变长岩富含钠（Na ₂ O/K ₂O > 2)。在哈克图中，两个侵入体对选定的主要和微量元素显示出不同的岩浆演化趋势，表明它们属于两个不同的岩浆系列。在归一化到原始地幔的微量元素图中，这两个侵入体都富含轻稀土元素，但缺乏高场强元素，如 Nb、Ta 和 Zr。全岩样品的低ε _{Nd 1960 Ma}值（− 3.1 to + 0.6 ），岩浆锆石样品的低ε _Hf ( t )值（− 2.2 to + 0.9），以及相对高的δ ¹⁸锆石晶体的 O 值 (+ 5.9 到 + 6.4‰) 表明两个侵入体的地幔源都被俯冲大陆地壳物质的流体/熔体交代。角闪石和/或含金云母地幔的部分熔融产生了具有叶白沟变长岩化学指纹特征的钙碱性熔体。更深的类似地幔源的小体积部分熔融产生了橄榄岩熔体，形成了武当照变二长闪长岩。武当召变二长闪长岩和野白沟变长岩是太古代基底上古元古代大陆岩浆弧的一部分。这项研究表明，在古代俯冲带上方可能同时存在钾长石岩和钙碱性岩浆作用，因此，