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Fluorite is a critical strategic non-metallic mineral resource with wide industrial applications. Here, we provide new constraints for the granite-related fluorite mineralization processes in the Zhangcuo-Banling ore belt in Shaowu of South China. We present geochronological constraints from granite zircon U-Pb, fluorite Sm-Nd, and quartz Rb-Sr dating. The results suggest that the fluorite mineralization ages (137 ± 27 Ma and 143 ± 14 Ma) are likely younger than the intrusion age of the granite (151.0 ± 1.3 Ma). Analyses of fluid inclusions reveal that the ore-forming fluids represent a NaCl-H 2 O fluid system with characteristics of medium-to-low temperature and low salinity. The δD V-SMOW values of fluorites range from −71.3 ‰ to −61.9 ‰, and the δ 18 O V-SMOW values range from −2.9 ‰ to 2.6 ‰, suggesting that the ore-forming fluids were primarily derived from meteoric water. The ( 87 Sr/ 86 Sr) t ratios of fluorite range from 0.716235 to 0.716635, while for quartz, the ratios range from 0.717106 to 0.720313. These values are consistent with the reported ( 87 Sr/ 86 Sr) t ratios of granite from South China, indicating that the Ca came from the ore-bearing granite. Considering the background of diagenesis and mineralization, along with the significantly high F content (1800 × 10 -6 to 7400 × 10 -6 ) in the granite, we propose that F originated from the leaching of biotite in the granite and the gaseous HF released from magma. This study establishes a granite-related hydrothermal fluorite mineralization model for the Shaowu region of South China.
You et al. (Thu,) studied this question.