Supplementary Table for "Origins of zircon xenocrysts in the Neoproterozoic South Anhui Ophiolite, Yangtze Block" submitted to Minerals

Zircon serves as a robust tracer for crustal recycling processes owing to its wide stability under diverse geological conditions. Its cryptic occurrence within ophiolites offers valuable insights into regional paleotectonic evolution. In this study, we identified abundant zircon xenocrysts in both peridotite and basalt units from the Neoproterozoic South Anhui Ophiolite (SAO) in southeastern Yangtze Block, South China. Zircon xenocrysts within the peridotite yield U-Pb ages ranging from ca. 2.7 to 1.0 Ga (n=21), with three peaks of 2.8–2.5 Ga, 2.2–1.8 Ga, and 1.2–1.0 Ga. Comparative analysis of age spectra suggests these xenocrysts likely sourced from recycled subducted continental materials within the Yangtze Block. In the basalts, zircon xenocrysts exhibit ages of ca. 2.1–0.9 Ga (n=27), with peaks of 1.1–0.9 Ga, 1.5–1.4 Ga, and 2.1–1.7 Ga. These zircons are interpreted to have been inherited from wall rocks through crustal contamination during magma ascent, as their age spectra closely resemble those of the surrounding basement strata. Collectively, these findings support that the SAO possibly formed in a back-arc basin setting, characterized by significant crust-mantle interactions.