| Citation: | Hang Yang, Shao-Cong Lai, Jiang-Feng Qin, Fang-Yi Zhang, Ren-Zhi Zhu, Yu Zhu, Min Liu, Shao-Wei Zhao, Zhen Yang. Geochronology, Geochemical and Sr-Nd-Pb Isotope of Syenites in the North Daba Mountains, South Qinling Belt: Constraints on Petrogenetic Evolution and Tectonic Implication. Journal of Earth Science, 2025, 36(5): 2193-2207. doi: 10.1007/s12583-022-1784-0
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A-type rocks have drawn considerable attention in the past few decades due to their distinctive mineralogical and geochemical fingerprints and prospective utility for geodynamic reconstruction of the lithosphere. A comprehensive study, involving zircon U-Pb geochronology, whole-rock elemental and Sr-Nd-Pb isotopic geochemistry, was undertaken to elucidate the origin and evolutionary process for syenites from the Daguiping area in the North Daba mountains, South Qinling belt. The syenites revealed an Ordovician igneous crystallization age of 454.4 ± 17 Ma, coeval with the neighboring mafic rocks. All samples show high SiO2, LREEs, and HFSEs (Nb, Ta, Zr and Hf) contents, with negative to slightly positive Eu (Eu/Eu* = 0.78–1.08) anomalies. The geochemical characteristics of the Daguiping syenites imply that they are of A1-type magmatic affinity, which is confirmed by their high total alkali levels (8.57 wt.%–11.94 wt.%), Zr + Nb + Ce + Y contents (738.00 ppm–1 734.78 ppm), and 10 000 × Ga/Al ratios (3.25–4.22), as well as low Y/Nb ratios (0.30–0.40). Our samples exhibit a wide range of initial 87Sr/86Sr ratios of 0.701 943 to 0.709 802 and a narrow range of 143Nd/144Nd ratios of 0.512 205–0.512 246 with
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