Aluminous A-type granites generally show high SiO₂ contents of >70 wt%, and their petrogenesis is still hotly debated with respect to source nature, magmatic processes and tectonic setting. This paper presents a comparison of petrography, geochronology and geochemistry between a Mesozoic syenogranite and its adjacently contemporaneous granitoids in the Xiong'ershan area, the hanging wall of the Paleozoic continental collision zone between the North China Craton and the North Qinling microcontinent. Syenogranites at Taishanmiao are metaluminous to weakly peraluminous, and belong to high-K calc-alkaline to shoshonitic series. They contain embayed bipyramidal quartz crystals, quartz-feldspar intergrowths and high Fe biotite species as well as accessory fluorite, magnetite and ilmenite. They exhibit significantly negative Ba, Sr and Eu anomalies with most δEu values of <0.5, and relatively high contents of Nb, Ta and Zr. They are weakly magnesian to ferroan in lithochemistry and mostly fall into the field of aluminous A-type granite in terms of their high Zr contents and 10,000 × Ga/Al ratios. Furthermore, they have low Y/Nb ratios of <1.20, falling into the A1-type field of the Nb-Y-Ce ternary diagram. The geochronological results indicate that the Taishanmiao syenogranites were emplaced into the late Paleoproterozoic Xiong'er Group volcanics at 119 ± 1 Ma, consistent with emplacement ages of the late stage non-adakitic granitoids at Funiushan in the same area. Whole-rock Nd and zircon HfO isotope compositions are similar between the two types of granitoids, indicating that they share a common magma source that is composed of the ancient crustal basement in the southern margin of the North China Craton and the juvenile crust of the North Qinling microcontinent. According to their petrographic and geochemical features, the syenogranites are categorized into aluminous A-type whereas the non-adakitic granitoids belong to I-type. Therefore, they were produced by partial melting of felsic restites after extraction of hydrous granitic melts to form the Funiushan I-type granites. As such, the composition of these granitoids is primarily dictated by both source composition and magmatic processes at the ancient convergent plate margin. Although the granitic magmatism would take place in the post-collisional period, the aluminous A-type granite was formed in the terminal stage of post-collisional magmatism. In addition, the post-collisional granites record reactivation of the hanging wall in the continental collision zone.

高铝A型花岗岩一般表现出高SiO ₂含量 > 70 wt%，其成因在源性、岩浆过程和构造背景方面仍存在激烈争论。本文比较了华北克拉通与北秦岭微大陆之间古生代大陆碰撞带上盘——熊耳山地区中生代正长花岗岩与其相邻同生花岗岩的岩石学、年代学和地球化学特征。台山庙正长花岗岩为元铝质至弱过铝质，属于高钾钙碱性至钾玄武岩系列。它们包含嵌入的双锥石英晶体、石英-长石共生体和高铁黑云母物种以及副萤石、磁铁矿和钛铁矿。它们表现出显着的负 Ba、Sr 和 Eu 异常，大多数 δEu 值 <0.5，Nb、Ta、Zr含量较高。它们在岩石化学中属于弱镁铁元素，Zr 含量高，Ga/Al 比为 10,000 × Ga/Al，多属于铝 A 型花岗岩领域。此外，它们具有 <1.20 的低 Y/Nb 比率，属于 Nb-Y-Ce 三元图的 A1 型场。年代学结果表明，泰山庙正长花岗岩于119±1 Ma就位于晚古元古代熊耳群火山岩中，与同一地区伏牛山晚期非埃达克花岗岩的就位年龄一致。全岩 Nd 和锆石 Hf 它们具有 <1.20 的低 Y/Nb 比率，属于 Nb-Y-Ce 三元图的 A1 型场。年代学结果表明，泰山庙正长花岗岩于119±1 Ma就位于晚古元古代熊耳群火山岩中，与同一地区伏牛山晚期非埃达克花岗岩的就位年龄一致。全岩 Nd 和锆石 Hf 它们具有 <1.20 的低 Y/Nb 比率，属于 Nb-Y-Ce 三元图的 A1 型场。年代学结果表明，泰山庙正长花岗岩于119±1 Ma就位于晚古元古代熊耳群火山岩中，与同一地区伏牛山晚期非埃达克花岗岩的就位年龄一致。全岩 Nd 和锆石 Hf两类花岗岩的O同位素组成相似，表明它们具有共同的岩浆来源，即华北克拉通南缘古地壳基底和北秦岭微大陆幼年地壳。根据岩石学和地球化学特征，正长花岗岩属于高铝A型，非埃达克花岗岩属于I型。因此，它们是在提取含水花岗岩熔体后，通过长英质残岩的部分熔融形成伏牛山I型花岗岩而产生的。因此，这些花岗岩的成分主要由古老会聚板块边缘的源成分和岩浆过程决定。虽然花岗质岩浆作用会发生在后碰撞时期，高铝A型花岗岩形成于后碰撞岩浆作用的末期。此外，碰撞后花岗岩记录了大陆碰撞带上盘的重新激活。