The Neoarchean basement rocks of the Qixingtai region in the northwest of western Shandong, eastern North China Craton are divided into western and eastern domains, separated by a ductile shear zone. The western domain is mainly composed of early Neoarchean tonalitic and supracrustal rocks, and the eastern domain is composed of late Neoarchean crustally‐derived granite with diverse early Neoarchean enclaves up to several kilometres long of supracrustal and gneissic TTG‐diorite rocks. This study reports an integrated field, whole‐rock geochemistry and zircon U–Pb‐Hf study on the granites and their enclaves in the eastern domain. The supracrustal enclaves are mainly composed of meta‐basaltic and meta‐ultramafic rocks and are the same in lithological association and formation time as the 2,750–2,700 Ma Liuhang “Formation” in the western area. The TTG‐diorite enclaves can be divided into early and late groups. Magmatic zircons from early TTG‐diorite samples have U–Pb ages of 2,731 ± 17 to 2,748 ± 13 Ma and ε_Hf(t) values of +2.7 to +9.5, whereas trondhjemite samples of the late group have U–Pb zircon ages of 2,588 ± 18 to 2,606 ± 12 Ma and ε_Hf(t) values of +0.6 to +6.5. The Hf isotopic signatures on magmatic zircon from the >2,700 Ma diorite‐tonalites indicate that they are predominantly juvenile crustal additions, probably with minor involvement of older crust in their genesis, as given by t_DM (Hf) ages ranging back to 2.92 Ga. The eastern granites range from monzogranite to syenogranite in composition and commonly have negative Eu anomalies, indicating residual plagioclase in the source region. Magmatic zircons from two granite samples have U–Pb ages of 2,516 ± 24 and 2,527 ± 18 Ma and ε_Hf(t) values of +1.0 to +7.0. A fine‐grained syenogranite dyke contains inherited early Neoarchean zircons with ε_Hf(t) values of +1.6 to +7.4. The isotopic signatures of the late Neoarchean granites that dominate the eastern domain show that they were derived from partial melting recycling of older continental crust recognized in the region – early Neoarchean rocks formed as a result of juvenile crustal additions. This is a common signature for late Archean crustal evolution throughout much of the North China Craton, and is the hallmark of some other Archean terranes, such as the Dharwar Craton of south India. The geodynamic explanations for the formation globally of vast amounts of crustally‐derived late Neoarchean granite are discussed.

中文翻译：

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山东西部七星台地区晚新古纪晚期花岗岩：华北克拉通早期新太古初地壳再循环的进一步证据

山东西部西北部，华北克拉通东部的七星台地区的新古宙基底岩分为西部和东部两个区域，由韧性剪切带隔开。西部地区主要由新新古纪晚期的胶结岩和上地壳岩组成，东部地区则由新新古纪晚期的地壳衍生的花岗岩组成，并具有长达数公里长的上壳和片麻质TTG-闪长岩岩体。这项研究报告了对东部地区花岗岩及其飞地的综合研究，全岩石地球化学和锆石U–Pb–Hf研究。地壳上的飞地主要由准玄武质和准超镁铁质岩石组成，其岩性组合和形成时间与西部地区的2,750-2,700 Ma Mahanghang“地层”相同。TTG-闪长岩飞地可以分为早期和晚期。早期TTG-闪长岩样品的岩浆锆石的U–Pb年龄为2,731±17至2,748±13 Ma，且ε_的Hf（吨），以9.5的2.7的值，而晚期组的奥样品具有2588±18 U-Pb定锆石年龄到2606±12 Ma和ε_的Hf（吨）的0.6到6.5的值。t _DM给出的> 2,700 Ma闪长岩-辉长岩岩浆锆石上的Hf同位素特征表明，它们主要是幼年地壳物质，可能与较早的地壳有少量关系。（Hf）年龄可追溯到2.92 Ga。东部花岗岩的成分从单花岗岩到正花岗岩，通常具有负Eu异常，表明在源区中残留斜长石。从两个花岗岩样品岩浆锆具有2516±24和2527±18 Ma和U-Pb年龄ε_铪（吨的1.0至7.0）的值。细粒度正长花岗岩堤防包含继承早太古代锆石与ε_的Hf（吨）的值，从+1.6到+7.4。在东部地区占主导地位的新古宙纪晚期花岗岩的同位素特征表明，它们来自该地区公认的较旧大陆壳的部分融化再循环-由于幼体地壳的添加而形成的新古宙纪早期岩石。这是整个华北克拉通大部分地区晚期太古宙地壳演化的共同标志，也是其他一些太古宙地带的标志，例如印度南部的达瓦尔克拉顿。讨论了在全球范围内形成的大量地壳衍生的新新纪古代花岗岩的地球动力学解释。