华北克拉通中条山地区成铁纪侵入杂岩的岩石成因与地球动力学意义

古元古代成铁纪(2.5-2.3Ga)岩浆活动记录的全球性匮乏一直是阻挠深入认识太古宙-元古宙之交地球构造体制嬗变过程的重要障碍。本申请拟选取华北克拉通中南部中条山地区成铁纪侵入杂岩为研究对象，借助离子探针锆石U-Pb定年建立中条山地区岩浆活动的精细年代学格架；综合野外岩体地质与室内岩相学观察，全岩主-微量元素、Nd-Hf同位素以及锆石微区原位Hf-Li-O同位素示踪，详细解析不同期次岩浆作用主要岩石类型的成因，及其表征的地幔、地壳源区性质与壳-幔相互作用。结合区域岩浆-沉积-变质记录，探讨研究区所在的中部造山带成铁纪构造演化历史；与全球成铁纪岩浆活动对比，为揭示元古宙早期全球重要构造体制嬗变过程中的地球动力学行为提供典型区域案例。

The global scarcity of Siderian (2.5-2.3Ga) magmatic records has restrained our understanding for the changes in Earth’s tectonic regimes across the Archean-Proterozoic boundary. This project intends to present a case study on Siderian intrusive complexes from the Zhongtiao Mountain (ZTM) region in the southern North China Craton (NCC). The SIMS zircon U-Pb dating will be performed to establish a detailed geochronological framework for the Siderian magmatism in the ZTM region. An integration of field and petrographic observations, whole-rock element and Nd-Hf isotope analyses and zircon in-situ Hf-Li-O isotope measurements will be made to ascertain the petrogenesis of main constituent rock types, characterize the nature of related mantle and crustal sources and deduce the crust-mantle interactions inherent in these magmatic rocks. By making systematic comparisons between the ZTM intrusions and the coeval magmatic-tectonic events from other regions of the NCC and the globe, this program aims to outline the tectonic evolution of the central NCC and explore the crucial geodynamic behaviors during the transition of global tectonic style in the Early Paleoproterozoic.