Longtoushan (gold, Dayaoshan)
Guangxi, southwestern Dayaoshan Uplift, China
Other hydrothermalAu
- Type
- Hydrothermal gold related to a rhyolite porphyry and a cryptoexplosive breccia
Gold deposit of the Dayaoshan Uplift, distinct from the tin-bearing Longtoushan of the Dachang field; abundant tourmaline in the rhyolite porphyry and associated breccia, replacing feldspar, distributed like the gold orebody. Qian et al. (2019): tourmalines from -15.4 to -12.3 ‰, ore fluid from -12.8 to -9.7 ‰, boron from an S-type rhyolitic melt; gold deposited mainly at the post-magmatic hydrothermal stage.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −13.2 ± 0.6 ‰ | −14 / −12.3 ‰ | 8 | tourmaline of the rhyolite porphyry (partly magmatic-hydrothermal) Mean and standard deviation recalculated from 8 analyses, -14.0 to -12.3 (SL104-1 -13.2; SL104-2 -12.3; SL104-3 -13.8; SL104-4 -13.5; SL104-5 -14.0; SL104-6 -12.9; SL104-7 -13.4; SL104-8 -12.4). Level 380 m. | Qian et al. (2019), Chemical and boron isotopic compositions of tourmaline in the Longtou… |
| −14.7 ± 0.4 ‰ | −15.4 / −14.3 ‰ | 8 | tourmaline of the cryptoexplosive breccia Mean and standard deviation recalculated from 8 analyses, -15.4 to -14.3 (SL12-1 -14.4; SL12-2 -14.5; SL12-3 -15.4; SL12-4 -14.3; SL12-5 -15.2; SL12-6 -14.8; SL12-7 -14.7; SL12-8 -14.5). Level 300 m. | Qian et al. (2019), Chemical and boron isotopic compositions of tourmaline in the Longtou… |
| −13.7 ± 0.7 ‰ | −14.4 / −12.3 ‰ | 7 | tourmaline of the biotite granite porphyry Mean and standard deviation recalculated from 7 analyses, -14.4 to -12.3 (SL58-1 -13.9; SL58-2 -14.4; SL58-3 -12.3; SL58-4 -14.0; SL58-5 -13.6; SL58-6 -13.8; SL58-7 -13.8). Level 340 m. | Qian et al. (2019), Chemical and boron isotopic compositions of tourmaline in the Longtou… |
| −14.4 ± 0.7 ‰ | −15.2 / −13.3 ‰ | 11 | tourmaline of quartz-pyrite-tourmaline veins in Lianhuashan Formation sandstone Mean and standard deviation recalculated from 11 analyses, -15.2 to -13.3 (SL25-1 -14.9; SL25-2 -15.2; SL25-3 -14.7; SL25-4 -14.6; SL25-5 -15.0; SL25-6 -13.8; SL25-7 -15.1; SL25-8 -14.0; SL25-9 -13.5; SL25-10 -14.2; SL25-11 -13.3). Level 300 m. | Qian et al. (2019), Chemical and boron isotopic compositions of tourmaline in the Longtou… |
Deposits of the same type
Cite this page
IsoFind Atlas (2026). Longtoushan (gold, Dayaoshan), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/longtoushan-or-dayaoshan/ (accessed 2026-10-19).
@misc{isofind2026longtoushangolddayaoshanisoto,
title = {Longtoushan (gold, Dayaoshan), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/longtoushan-or-dayaoshan/},
note = {Accessed 2026-10-19}
}Updated : 2026-10-19