The Ningi-Burra Pb−Zn mineralization forms part of the Nigerian Sn-Nb ± (Pb-Zn-Mo)-rich anorogenic alkaline province, also known as the Nigerian Younger Granite Complexes. Six distinct E-W trending magmatic centres have been identified in the Ningi-Burra complex, but the Pb−Zn mineralization is confined to highly evolved biotite granite in Koluki (centre 6). In this paper, a combination of geochronological and geochemical data of magmatic and hydrothermally-altered zircon from the Ningi-Burra complex are used to constrain magmatic and hydrothermal processes that facilitated the formation of Pb−Zn mineralization. Zircon trace element and Hf isotopes (εHf(t) = −5.3 to −10.3) indicate that the parental magma of these ore-bearing granites were largely derived from lower crustal sources with contributions from the upper mantle. The hydrothermal alteration that accompanied the Pb−Zn mineralization include silicification, chloritization and limited sodic metasomatism. Zircon U/Pb dating reveal that magma emplacement and subsequent hydrothermal process in Ningi-Burra complex occurred at (~192 Ma) and (<191 Ma), respectively. Zircon grains from unmineralized and hydrothermally altered rock suites have similar ¹⁷⁶Hf/¹⁷⁷Hf but distinct ¹⁷⁶Lu/¹⁷⁷Hf and ¹⁷⁶Yb/¹⁷⁷Hf ratios which suggest a magmatic source for the hydrothermal fluids responsible for the formation of the mineralization. This study highlights the application of zircon trace element and U-Th-Hf isotopes as robust tools for constraining magmatic and mineralization process that facilitate the formation of economically significant mineralization in highly differentiated granites.

Ningi-Burra的Pb-Zn矿化是尼日利亚富含Sn-Nb±（Pb-Zn-Mo）的厌食碱性省的一部分，也称为尼日利亚Younger Granite Complexs。六个不同的E在Ningi-Burra复合体中已发现-W趋势岩浆中心，但是Pb-Zn矿化作用仅限于Koluki（中心6）的高度演化的黑云母花岗岩。本文结合Ningi-Burra岩体的岩浆和热液蚀变锆石的地质年代学和地球化学数据，来约束有利于Pb-Zn矿化形成的岩浆和热液过程。锆石微量元素和Hf同位素（εHf（t）= -5.3至-10.3）表明，这些含矿花岗岩的母岩浆主要来自下地壳源，而上地幔也有贡献。伴随着Pb-Zn矿化作用的热液蚀变包括硅化作用，氯化作用和有限的钠系交代作用。锆石U / Pb测年表明，Ningi-Burra岩浆中的岩浆侵位和随后的热液过程分别发生在（〜192 Ma）和（<191 Ma）。未矿化和热液蚀变的岩石套件中的锆石颗粒具有相似的¹⁷⁶ Hf / ¹⁷⁷ Hf，但明显不同的¹⁷⁶ Lu / ¹⁷⁷ Hf和¹⁷⁶ Yb / ¹⁷⁷ Hf比率，暗示了形成矿化作用的热液流体的岩浆源。这项研究强调了锆石微量元素和U-Th-Hf同位素作为约束岩浆和成矿过程的强大工具的应用，这些过程有助于在高度分化的花岗岩中形成具有经济意义的成矿作用。