Yao'an
Western Yunnan (Heqing according to the source), China
PorphyriesPb-Ag-Au
- Type
- Pb-Ag-Au related to an alkali syenite porphyry
Cenozoic alkali-rich porphyry belt of Jinshajiang-Ailaoshan (western Yunnan): silicon of the mineralising fluids (silicified quartz, hemimorphite) lighter than that of the porphyries (0.0 to 0.4 ‰), two sources according to the authors. Highly alkaline intrusion, poor in Ca, Mg and Fe, favourable to lead, silver and gold; altered gold-bearing sandstones (Upper Cretaceous). The source places the deposit at Heqing, other work in Yao'an County. Deposit not located: the place cited in the source could not be tied to reliable coordinates.
δ30Si in ‰ (per mil) Values of the same system
Standard : NBS 28
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.4 ± 0.14 ‰ | 0.3 / 0.5 ‰ | 2 | altered gold-bearing porphyry and sandstone Mean and standard deviation recalculated from 2 samples, YAJ-13 (porphyry) and YAJ-27 (sandstone). Host syenite porphyry 0.0 ‰, host siltstone -0.2 ‰. | Liu et al. (2004), Geochemical trace of silicon isotopes of intrusions and ore veins rela… |
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Cite this page
IsoFind Atlas (2026). Yao'an, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/yao-an/ (accessed 2026-10-13).
@misc{isofind2026yaoanisotopesignatures,
title = {Yao'an, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/yao-an/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13