Xiaotunxiang fluorite deposit, Zhenfeng County, Qianxinan, Guizhou, Chinai

Regional Level Types
Xiaotunxiang fluorite deposit	Deposit
Zhenfeng County	County
Qianxinan	Prefecture
Guizhou	Province
China	Country

Fluorite precipitation was primarily triggered by fluid–rock interaction, wherein acidic, fluorine-rich fluids reacted with and neutralized against carbonate host rocks, causing rapid CaF2 deposition. The deposit is classified as a carbonate-hosted, low-temperature hydrothermal fluorite deposit and represents an integral part of a larger fluorite– stibnite metallogenic system. The ore-hosting strata are primarily the Middle Permian Maokou Formation (P2m) and the first member of the Upper Permian Longtan Formation (P3l 1 ). The Maokou Formation consists mainly of gray medium-to-thick bedded limestone with abundant bioclasts, locally interbedded with light gray medium-bedded dolomitic limestone. It commonly contains stylolites and has a thickness exceeding 400 m. The upper part of the first Longtan member (P3l 1 ) comprises gray medium-bedded clayey sandstone, while the middle and lower parts are gray-black thick-bedded sandy claystone with an average thickness of 70.24 m. The fluorite orebody is predominantly stratiform and is hosted within the structural alteration zones near the core of the Zhenfeng anticline. The host rocks are claystone and limestone. The orebody extends NE-SW for approximately 3.2 km, a trend parallel to the ~310° strike of the northwestern limb of the Zhenfeng anticline. It extends about 200 m down the dip of the structure, which averages 45° towards the northwest, with an average thickness of 4.04 m and a maximum thickness of 8.2 m encountered in drill hole ZK001. Fluorite content is high, ranging from 32.27% to 52.11%, with average grade of 40.38%. Stage I: Early Fluorite Mineralization. This stage is characterized by the precipitation of milky white to gray-white, massive fluorite. Stage II: Stibnite–Barite–Calcite Association. This intermediate stage marks a shift in fluid chemistry. Stage III: Late Silicification. The final major hydrothermal event involved pervasive silicification, depositing massive, granular quartz.
A large-scale fluorite resource (1.28 Mt ore reserves).

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References