Ulaan
North-eastern Mongolia, Mongol-Okhotsk orogenic belt, Mongolia
Other hydrothermalAg-Pb-Zn
- Type
- Breccia-pipe-hosted Ag-Pb-Zn deposit in rhyolites
The largest Ag-Pb-Zn deposit in Mongolia (2240 t Ag, 0.44 Mt Pb, 0.81 Mt Zn), as cylindrical bodies controlled by a concealed breccia pipe in Middle to Late Jurassic A-type rhyolites (about 161 Ma). Mineralisation dated at 146 ± 3 Ma (Rb-Sr), between 331 and 449 °C, after closure of the Mongol-Okhotsk Ocean; sulfur and lead mostly magmatic or deep-seated. Indicative coordinates.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 1.95 ± 0.31 ‰ | 1.6 / 2.3 ‰ | 4 | galena Mean and standard deviation recalculated from 4 samples, Table 3. Sphalerite-galena pairs: 331 to 449 °C. | Wu et al. (2024), Genesis of the Ulaan silver-lead-zinc deposit in Northeast Mongolia: Co… |
| 3.76 ± 0.43 ‰ | 3.2 / 4.3 ‰ | 5 | sphalerite Mean and standard deviation recalculated from 5 samples, Table 3. | Wu et al. (2024), Genesis of the Ulaan silver-lead-zinc deposit in Northeast Mongolia: Co… |
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 18.336 ± 0.015 | 18.318 / 18.354 | 5 | galena Mean and standard deviation recalculated from 5 samples, Table 4. Published means 18.3362, 15.57 and 38.2232. | Wu et al. (2024), Genesis of the Ulaan silver-lead-zinc deposit in Northeast Mongolia: Co… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.57 ± 0.019 | 15.543 / 15.594 | 5 | galena Mean and standard deviation recalculated from 5 samples, Table 4. Published means 18.3362, 15.57 and 38.2232. | Wu et al. (2024), Genesis of the Ulaan silver-lead-zinc deposit in Northeast Mongolia: Co… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 38.223 ± 0.062 | 38.138 / 38.301 | 5 | galena Mean and standard deviation recalculated from 5 samples, Table 4. Published means 18.3362, 15.57 and 38.2232. | Wu et al. (2024), Genesis of the Ulaan silver-lead-zinc deposit in Northeast Mongolia: Co… |
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : NIST SRM 987
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.711454 ± 0.000072 | 6 | ore minerals (sphalerite, pyrite, galena, quartz, fluorite; isochron initial ratio) Initial ratio of the 146 ± 3 Ma isochron (6 points, MSWD = 1.3), Table 5; the text wrongly calls it initial 87Rb/86Sr. Fluorite measured at 0.71146 and 0.71165. | Wu et al. (2024), Genesis of the Ulaan silver-lead-zinc deposit in Northeast Mongolia: Co… |
Deposits of the same type
- Beiwagou China
- Qingchengzi orefield (Zhenzigou, Xiquegou, Gaojiabaozi) China
- Jiaojia (Jiaodong gold district) China
- Linglong (Jiaodong gold district) China
- Canzhuang (Jiaodong gold district) China
- Xunyang China
- Khingan (Khinganskoe) Russia
- Dae Hwa Corée du Sud
Cite this page
IsoFind Atlas (2026). Ulaan, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/ulaan/ (accessed 2026-10-13).
@misc{isofind2026ulaanisotopesignatures,
title = {Ulaan, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/ulaan/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13