AUTHOR=Wei Pengfei , Li Dapeng , Song Zhigang , Liu Qiang , Geng Ke , Zhang Yan , Ding Chengwu , Cai Na , Li Zengsheng , Zhang Chao , Xie Wei 

TITLE=Petrogenesis and relationship with REE mineralization of the quartz syenite from Chishan and Longbaoshan alkaline complex, southeastern North China Craton: Insights from zircon U–Pb geochronology, element, and Sr–Nd–Pb–Hf isotope geochemistry

JOURNAL=Frontiers in Earth Science

VOLUME=10

YEAR=2023

URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2022.1046071

DOI=10.3389/feart.2022.1046071

ISSN=2296-6463

ABSTRACT=<p>Mesozoic alkaline complexes associated with the rare earth element (REE) mineralization are developed in southeastern North China Craton (NCC), and they recorded some important information about the lithospheric thinning and destruction of the NCC. Zircon U–Pb dating results reveal that syenitic rocks from the Chishan and Longbaoshan alkaline complexes were emplaced at <italic>ca.</italic> 126.2–123.7 Ma. These syenitic rocks have an arc-like affinity with enriched LREEs and LILEs (e.g., Ba and Th) and depleted HFSE (e.g., Nb and Ta). However, they plot within the extensional alkaline–calc-alkaline field in the lg (CaO/(K<sub>2</sub>O + Na<sub>2</sub>O)) versus SiO<sub>2</sub> discrimination diagram and plot within the fields of the divergent plate and within-plate settings in the Nb<sub>N</sub> versus Th<sub>N</sub> discrimination diagram, implying an extensional tectonic setting. Thus, we suggest that the syenitic rocks should form in an extensional tectonic settings related to rollback and retreat of the subducting Paleo-Pacific plate. These syenitic rocks have similar Sr–Nd–Pb–Hf isotope compositions ((<sup>87</sup>Sr/<sup>86</sup>Sr)<sub>i</sub> = 0.7062 to 0.7101, ε<sub>Nd</sub>(t) = −8.2 to −15.0, ε<sub>Hf</sub>(t) = −13.5 to −9.6), which are the same as the enriched subcontinental lithospheric mantle (SCLM) of the NCC. Taking into account not only our new data but also previously published data regarding the evolution of NCC in the Mesozoic, we conclude that the syenitic rocks from the Chishan and Longbaoshan complexes are derived from partial melting of the lithospheric mantle triggered by the Paleo-Pacific plate subduction. Moreover, the geochemical and Sr–Nd–Pb isotopic similarity between the Chishan REE ores, Longbaoshan altered rocks, and the syenitic rocks implied that they are homologous products of Early Cretaceous and that the mineralization shows inheritance to the magmatic hydrothermal evolution.</p>