Khoun Puc
North-east Vietnam, Lo Gam domain, Lang Vai district, Viêt Nam
Other hydrothermalAu (Sb)
- Type
- Intrusion-related gold-antimony in crushed zones and quartz veins
Lang Vai gold district (Lo Gam domain, north-east Vietnam; proven reserves over 13.5 t Au, 186.8 t Ag and 46 t Sb), an intrusion-related gold system according to the authors: mineralisation at about 240-236 Ma, close to the Phia Bioc granite complex (254-245 Ma). Host rocks: Devonian limestones and sericite-carbonate shales (Mia Le Formation). Sequence: arsenopyrite-pyrite-gold-sphalerite, Bi-bearing Pb-Sb sulfosalts, Bi-free Pb-Sb sulfosalts, Sb sulfosalts, stibnite-berthierite-native Sb, Pb-rich sulfosalts (distal). Initial hot, reduced (CO2-CH4)-H2O-NaCl fluid, then cooler CO2-H2O-NaCl; boiling and depth of 12.9 to 15.2 km. Khoun Puc: 5 ore zones up to 1400 m long and 150-350 m wide, 8 gold-antimony bodies and 12 gold veins; arsenopyrite, pyrite, jamesonite, kobellite, zinkenite, native gold and bismuth, without Sb-rich minerals. Nevolko et al. (2019): arsenopyrite from -3.8 to +1.1 ‰, calcite from +14.1 to +15.7 ‰ in δ18O, inclusions of the Au-As (339-352 °C, 8.2-13.9 wt% NaCl equiv.) and Bi-Pb-Sb (304-340 °C) stages. Coordinates read from the district geological map (Fig. 2, frame 105°16'-105°28' E, 22°10'-22°23' N), indicative.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.7 ± 1.8 ‰ | −3.8 / 1.1 ‰ | 6 | auriferous arsenopyrite (Au-As stage) Mean and standard deviation recalculated from 6 analyses, -3.8 to +1.1 (VR-5/1b -1; VR-5/3b +1.1; KC14-324/2 -3.8; KC14-323/2 -1.4; KC14-323/3 +0.5; KC14-323/4 +0.5). Published mean of -0.7 ‰. | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… |
| −1.3 ‰ | 1 | pyrite (Au-As stage) Single analysis (VR-5/2a). | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… |
δ13C in ‰ (per mil) Values of the same system
Standard : V-PDB
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.07 ± 1.83 ‰ | −1.5 / 1.99 ‰ | 3 | hydrothermal calcite Mean and standard deviation recalculated from 3 analyses, -1.5 to +1.99 (KC14-804/3 +1.99; VR-5/1b -1.5; VR-5/3a -0.7). Published means of -0.1 ‰ (δ13C) and +15 ‰ (δ18O). | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 14.98 ± 0.83 ‰ | 14.1 / 15.74 ‰ | 3 | hydrothermal calcite Mean and standard deviation recalculated from 3 analyses, +14.1 to +15.74 (KC14-804/3 +15.74; VR-5/1b +14.1; VR-5/3a +15.1). Published means of -0.1 ‰ (δ13C) and +15 ‰ (δ18O). | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… |
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 18.4578 | 1 | arsenopyrite Single analysis (VR-5/3b). ± 0.0003 (2σ). Two-end-member mixing, radiogenic and unradiogenic, on the plumbotectonic diagram according to the authors. | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… | |
| 18.4373 | 1 | jamesonite Single analysis (VR-5/1b). ± 0.0003 (2σ). Two-end-member mixing, radiogenic and unradiogenic, on the plumbotectonic diagram according to the authors. | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.7393 | 1 | arsenopyrite Single analysis (VR-5/3b). ± 0.0004 (2σ). Two-end-member mixing, radiogenic and unradiogenic, on the plumbotectonic diagram according to the authors. | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… | |
| 15.7431 | 1 | jamesonite Single analysis (VR-5/1b). ± 0.0003 (2σ). Two-end-member mixing, radiogenic and unradiogenic, on the plumbotectonic diagram according to the authors. | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 38.876 | 1 | arsenopyrite Single analysis (VR-5/3b). ± 0.0012 (2σ). Two-end-member mixing, radiogenic and unradiogenic, on the plumbotectonic diagram according to the authors. | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… | |
| 38.8506 | 1 | jamesonite Single analysis (VR-5/1b). ± 0.0009 (2σ). Two-end-member mixing, radiogenic and unradiogenic, on the plumbotectonic diagram according to the authors. | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… |
Deposits of the same type
- Lang Vai Viêt Nam
- Lung Luong Viêt Nam
- Na Bop-Pu Sap Viêt Nam
- Binh Do Viêt Nam
- Lanmuchang China
- Damingshan (tungsten) China
- Shuiyindong China
- Tongkeng (Changpo-Tongkeng) China
Cite this page
IsoFind Atlas (2026). Khoun Puc, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/khoun-puc/ (accessed 2026-10-19).
@misc{isofind2026khounpucisotopesignatures,
title = {Khoun Puc, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/khoun-puc/},
note = {Accessed 2026-10-19}
}Updated : 2026-10-19