Lang Vai
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. Lang Vai: 5 parallel zones of 500-1400 m by 100-600 m, 32 bodies over more than 200 m height; arsenopyrite, pyrite, stibnite, jamesonite, berthierite, argentian tetrahedrite, native gold and Sb. Nevolko et al. (2019): sulfides from -2.3 to +1.4 ‰ (stibnite slightly heavier), calcite from -4 to +0.14 ‰ in δ13C, Sb-stage fluid at 180-230 °C and 1.1-9.3 wt% NaCl equiv. 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 |
|---|---|---|---|---|
| −0.8 ± 0.9 ‰ | −2.3 / 0.1 ‰ | 5 | arsenopyrite (Au-As stage) Mean and standard deviation recalculated from 5 analyses, -2.3 to +0.1 (VR-4/9 -0.4; KP08/28 +0.1; KC14-326/3 -0.7; KC14-327/1 -0.7; VR-4/8 -2.3). Published mean of -0.8 ‰. | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… |
| −0.9 ± 0.6 ‰ | −1.3 / −0.4 ‰ | 2 | pyrite (Au-As stage) Mean and standard deviation recalculated from 2 analyses, -1.3 to -0.4 (VR-4/6 -1.3; VR-4/9 -0.4). Published mean of -0.85 ‰. | Nevolko et al. (2019), Origin of the intrusion-related Lang Vai gold-antimony district (N… |
| −0.1 ± 1.3 ‰ | −1.2 / 1.4 ‰ | 3 | stibnite (Sb stage) Mean and standard deviation recalculated from 3 analyses, -1.2 to +1.4 (VR-4/2 -0.4; VR-3/1 +1.4; KC14-327/1 -1.2). Published mean of -0.06 ‰; slight increase ascribed to thermochemical sulfate reduction by the authors. | 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 |
|---|---|---|---|---|
| −2.68 ± 1.51 ‰ | −4 / 0.14 ‰ | 12 | hydrothermal calcite Mean and standard deviation recalculated from 12 analyses, -4 to +0.14 (P29 -3.2; KC14-327/1-1 -3.7; P29-1 -1.8; KC14-327/3 -3.8; KC14-327/2 -4; VR-4/3 -3.6; VR-4/7 -1.3; KC14-802/1 +0.14; KC14-801/1 -4; KC14-801/2 -0.1; KC14-327 -3.24; VR-4/2 -3.51). Published means of -2.67 ‰ (δ13C) and +17.4 ‰ (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 |
|---|---|---|---|---|
| 17.42 ± 0.61 ‰ | 16.5 / 18.6 ‰ | 12 | hydrothermal calcite Mean and standard deviation recalculated from 12 analyses, +16.5 to +18.6 (P29 +17.2; KC14-327/1-1 +17.6; P29-1 +16.5; KC14-327/3 +17; KC14-327/2 +16.6; VR-4/3 +17.1; VR-4/7 +18.6; KC14-802/1 +17.35; KC14-801/1 +17.66; KC14-801/2 +18.21; KC14-327 +17.39; VR-4/2 +17.82). Published means of -2.67 ‰ (δ13C) and +17.4 ‰ (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 |
|---|---|---|---|---|
| 18.6021 | 1 | arsenopyrite Single analysis (VR-4/6). ± 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… | |
| 18.5322 | 1 | jamesonite Single analysis (KC14-327). ± 0.0013 (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 |
|---|---|---|---|---|
| 15.7474 | 1 | arsenopyrite Single analysis (VR-4/6). ± 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… | |
| 15.7707 | 1 | jamesonite Single analysis (KC14-327). ± 0.0014 (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 |
|---|---|---|---|---|
| 38.8927 | 1 | arsenopyrite Single analysis (VR-4/6). ± 0.0008 (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… | |
| 38.9763 | 1 | jamesonite Single analysis (KC14-327). ± 0.0043 (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… |
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Cite this page
IsoFind Atlas (2026). Lang Vai, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/lang-vai/ (accessed 2026-10-19).
@misc{isofind2026langvaiisotopesignatures,
title = {Lang Vai, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/lang-vai/},
note = {Accessed 2026-10-19}
}Updated : 2026-10-19