Gatsuurt
Selenge, North Khentii Gold Belt (Dzuunmod area), Mongolia
Orogenic goldAu
- Type
- Orogenic gold (veins, disseminations and stockworks)
North Khentii Gold Belt (Khentii basin, Mongol-Okhotsk orogenic belt), Haraa terrane: Haraa Group metasediments (Middle Cambrian to Early Ordovician) cut by the Boroogol granitoid complex (Ordovician) and the Dzuunmod rhyolitic subvolcanic complex; sericitic, siliceous and potassic alteration, pyrite and arsenopyrite with invisible gold, late native gold. Fluid calculated at 275 °C (arsenopyrite geothermometer) at δ18O +6.3 to +9.3 ‰, of metamorphic origin; heterogeneous sulphur source, wall-rock sulphidation according to Kim et al. (2020). Discovered in 1998, over 50 t gold estimated; Main, Central, South Slope and GT60 zones along the sinistral Sujigtei fault, in Boroogol granitoids, Haraa metasediments and rhyolites; siliceous zones (including blue quartz in the Central zone); 40Ar-39Ar age of about 178 Ma. Coordinates not given.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 1.07 ± 1.3 ‰ | −0.7 / 2.8 ‰ | 7 | pyrite of disseminated and siliceous ores Mean and standard deviation recalculated from 7 analyses. | Kim et al. (2020), Geology, mineralogy and stable isotope geochemistry of the Dzuunmod ar… |
| 1.76 ± 6.95 ‰ | −2.6 / 17.2 ‰ | 7 | arsenopyrite of disseminated, vein and siliceous ores Mean and standard deviation recalculated from 7 analyses, GT-376 (sulphidised rhyolite porphyry) at +17.2 ‰, the highest value of the district. | Kim et al. (2020), Geology, mineralogy and stable isotope geochemistry of the Dzuunmod ar… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.66 ± 0.78 ‰ | 14.7 / 16.7 ‰ | 7 | quartz of veins and siliceous zones Mean and standard deviation recalculated from 7 analyses, fluid calculated at 275 °C (Friedman and O'Neil, 1977) of +6.3 to +8.3 ‰. | Kim et al. (2020), Geology, mineralogy and stable isotope geochemistry of the Dzuunmod ar… |
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Cite this page
IsoFind Atlas (2026). Gatsuurt, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/gatsuurt/ (accessed 2026-10-14).
@misc{isofind2026gatsuurtisotopesignatures,
title = {Gatsuurt, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/gatsuurt/},
note = {Accessed 2026-10-14}
}Updated : 2026-10-14