Numerous late Mesozoic (Late Jurassic to Early Cretaceous) granitic plutons are present along the southern margin of the North China Craton (s-NCC), which belongs to the northernmost tectonic unit of the eastern Qinling orogenic belt. This tectonic unit records multiple tectonothermal and metallogenic events that occurred after continental collision of the North and South China Cratons in the late Early to Middle Triassic. This study reports the zircon U-Pb ages and the whole-rock and apatite geochemical compositions of the Taishanmiao granite, one of the largest late Mesozoic plutons in eastern Qinling. Three phases of this granite, emplaced between ∼125 and ∼113 Ma, are characterized by uniformly high SiO₂ and K₂O but low CaO, ^TFe₂O₃, and MgO contents and enriched Nd isotopic composition with initial ε_Nd values of −13.5 to −12.7. Geochemical features reveal that these are A-type granites derived from partial melting mainly of ancient crust. Temperatures obtained from Ti-in-zircon thermometry and oxygen fugacity (fO₂) data indicate that the magma(s) formed at high crystallization temperatures (∼800°–840°C) and fO₂ levels (fayalite–magnetite–quartz [FMQ] buffer −1.5 to +1.5). Comparison with neighboring granites, such as the ∼150–130 Ma adakitic Heyu granite and the ∼115 Ma Donggou ore-bearing granite porphyry, implies that the Heyu granite formed from thickened crust and that the Donggou granite porphyry and Taishanmiao granite likely originated from a consistent magma system during the crustal thinning that occurred ∼125–113 Ma, except the porphyry rock was more evolved. This finding implies that their uniform magma chamber could provide sufficient metals and associated materials and even energy for the Donggou Mo deposit.

中文翻译：

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东秦岭造山带泰山庙A型花岗岩的成岩作用：对晚白垩世构造过渡和成矿意义

华北克拉通（s-NCC）的南部边缘存在着许多中生代晚期（侏罗纪至白垩纪早期）花岗岩体，该岩体属于东秦岭造山带的最北构造单元。该构造单元记录了三叠纪早期至中三叠世晚期华北和华南克拉通大陆碰撞后发生的多次构造热和成矿事件。这项研究报告了泰山庙花岗岩的锆石U-Pb年龄以及全岩和磷灰石地球化学成分，这是秦岭东部最大的中生代晚期岩体之一。该花岗岩的三相分布在〜125和〜113 Ma之间，其特征在于均匀的高SiO ₂和K ₂ O但低的CaO，^T Fe ₂Ó ₃，和MgO含量和丰富的Nd同位素组成与初始ε_钕的-13.5值-12.7。地球化学特征表明，它们是A型花岗岩，主要来自古地壳的部分熔融。通过锆石钛测温法获得的温度和氧逸度（f O ₂）数据表明，岩浆是在较高的结晶温度（〜800°–840°C）和f O _{2下形成的}级别（铁橄榄石-磁铁矿-石英[FMQ]缓冲区-1.5至+1.5）。与周围的花岗岩进行比较，例如约150-130 Ma的达克质河宇花岗岩和约115 Ma的东沟含矿花岗岩斑岩，表明该河宇花岗岩是由增厚的地壳形成的，而东沟花岗岩斑岩和台山庙花岗岩很可能起源于一个花岗岩。地壳减薄过程中一致的岩浆系统发生在〜125-113 Ma之间，除了斑岩岩更易发育。这一发现暗示着它们均匀的岩浆腔可以为东沟钼矿床提供足够的金属，伴生材料甚至能量。