| Citation: | LI Yuanhong，DU Hongyi，CHEN Jun，et al. The geochemistry and genesis of hydrothermal barite deposits within interlaminar fracture zone, Yuqing County, Guizhou Province[J]. Bulletin of Geological Science and Technology，2025，44（3）：1-12 doi: 10.19509/j.cnki.dzkq.tb20240350
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Hydrothermal barite deposits are the main exploration targets for barium. The Wuling-Miaoling area, located in the middle part of the Yangtze craton, contains abundant hydrothermal barite deposits. In recent years, some barite orebodies have been discovered within interlaminar fracture zone between the Upper Cambrian Loushanguan Formation and the in the Lower Ordovician Tongzi Formation in the region. The orebodies with stable extension are of great metallogenic potential. However, the genesis of the barite deposits in the Yuqing area are poorly understood, leading to ambiguity about the further ore exploration.
In this contribution, we investigate the barite deposits in the Yuqing area, presenting a metallogenic model based on detailed petrographic observations and major/trace elements and sulfur isotopic analyses.
Our results show that the interlayer fracture zone and tensile fracture generated by silica-calcium interface are the main ore-controlling structures of barite in this area. The geochemistry of barite shows that the δCe of wall rocks (dolomite) has no abnormalities. In contrast, the negative δCe anomaly (mean 0.66) of barite samples indicates that barite is formed under oxidation conditions. The Sr vs. (Cu Zn), Y/Ho ratios and sulfur isotopes suggest that ore-forming material (S and Ba) soured from marine evaporite in the Cambrian strata.
Based on previous studies, we propose that the Yanshanian tectonic event drove the migration of the basinal fluids that extracted the Ba-rich evaporite strata. The mixing with meteorite caused the precipitation of barite along the interlayer faults (silica-calcium interfaces).
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