Xiaotunxiang (fluorite-antimony)

Guizhou, Zhenfeng County (Qianxinan Prefecture), axis of the Zhenfeng anticline, China

Other hydrothermalF, Sb

Type: Large fluorite deposit with deep antimony bodies, as concordant bands in the Maokou limestone and a silicified tectonic alteration body (Sbt)

Fluorite deposit (more than 1.28 Mt of ore) on the axis of the Zhenfeng anticline, closed by the north-west-trending reverse faults F1 and F2; antimony bodies recently found at depth, about 50 km from the Qinglong (Dachang) district. Simple ore: stibnite (over 95 % of sulfides), minor pyrite (including sedimentary framboids), quartz and fluorite; Middle Permian host (Maokou limestone) below the Longtan Formation. Peng et al. (2023): stibnite strongly depleted in 34S (-28.40 to -22.44 ‰, mean -25.33 ‰), far from the other deposits of the South China antimony belt (-14.9 to +16.8 ‰): sulfur reduced by bacteria (BSR) from marine sulfate before mineralisation, since fluorite formed at 100-176 °C (Dai et al., 2018); stibnite precipitates where an Sb-rich fluid mixes with a fluid rich in light sulfur. Coordinates not published.

δ34S in ‰ (per mil) Values of the same system

Standard : V-CDT

Value	Range	n	Mineral or matrix	Source
−26.11 ± 1.25 ‰	−28.4 / −25.07 ‰	9	stibnite (separate powder) Mean and standard deviation recalculated from 9 analyses, -28.40 to -25.07 (XY-D-2 -25.34; XY-D-3 -25.68; XY-D-4 -25.32; XY-D-5 -25.59; XY-D-6 -25.62; XY-D-7 -25.87; XY-D-9 -28.40; XY-D-11 -25.07; XY-D-14 -28.14). Published mean -26.11 ‰.	Peng et al. (2023), Geochemical characteristics of sulfur isotopes for the Xiaotunxiang f…
−24.74 ± 1.48 ‰	−26.74 / −22.44 ‰	12	stibnite (in situ laser analysis) Mean and standard deviation recalculated from 12 analyses, -26.74 to -22.44 (XYD-3-1 -24.15; XYD-3-3 -23.32; XYD-3-5 -23.11; XYD-3-7 -22.44; XYD-3-9 -23.49; XYD-6-1 -24.23; XYD-6-2 -26.74; XYD-6-3 -26.25; XYD-6-4 -25.26; XYD-6-5 -25.50; XYD-6-6 -25.69; XYD-6-7 -26.70). Published mean -24.74 ‰; spots on two samples (XYD-3 and XYD-6).	Peng et al. (2023), Geochemical characteristics of sulfur isotopes for the Xiaotunxiang f…

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Cite this page

IsoFind Atlas (2026). Xiaotunxiang (fluorite-antimony), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/xiaotunxiang-fluorine-antimoine/ (accessed 2026-10-21).

@misc{isofind2026xiaotunxiangfluoriteantimonyi,
  title = {Xiaotunxiang (fluorite-antimony), isotope signatures},
  author = {{IsoFind Atlas}},
  year = {2026},
  url = {https://www.isofind.tech/isotopes/en/deposits/xiaotunxiang-fluorine-antimoine/},
  note = {Accessed 2026-10-21}
}

Updated : 2026-10-21