Niujuan
Hebei, Fengning (North Hebei metallogenic belt, northern margin of the North China Craton), China
Other hydrothermalAg (Pb, Zn)
- Type
- Breccia-hosted silver related to subvolcanic intrusions
Reserve of 652 t Ag at 277.85 g/t in five breccia bodies along the Niujuan-Laohuba fault, at the contact of Mesozoic granites (Baiyingou, Hercynian; Er'daogou, 145.5 ± 2.1 Ma by zircon U-Pb) and the Hongqiyingzi metamorphic group. Four stages: quartz (I), quartz-pyrite (II), polymetallic sulfides with argentite and native silver (III, main) and fluorite (IV, Sm-Nd isochron of 139.2 ± 3.8 Ma, initial Nd 0.511785). Li et al. (2017): deep sulfur and lead, magmatic fluid mixed with meteoric water, 12 to 61 % mantle helium. Indicative coordinates: about 38 km north of Fengning town from Figure 1c of Li et al. (2017), to within 15 km.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 3.6 ± 1.1 ‰ | 2.6 / 4.7 ‰ | 3 | stage II and III pyrite Mean and standard deviation recalculated from 3 analyses, +2.6 to +4.7 (1-73-5 (stage II) +2.6; 1-77-6 (stage II) +3.6; 5-71-3 (stage III) +4.7). Published pyrite mean +3.6 ‰. Sulfides from 1150 to 1190 m depth. | Li et al. (2017), Isotope geochemistry and geochronology of the Niujuan silver deposit, n… |
| 2.8 ± 0.5 ‰ | 2.4 / 3.1 ‰ | 2 | stage III galena Mean and standard deviation recalculated from 2 analyses, +2.4 to +3.1 (5-73-5(Gn) (stage III) +2.4; 5-73-4(Gn) (stage III) +3.1). Published galena mean +2.8 ‰. Sulfides from 1150 to 1190 m depth. | Li et al. (2017), Isotope geochemistry and geochronology of the Niujuan silver deposit, n… |
| 5.3 ± 0.1 ‰ | 5.2 / 5.3 ‰ | 2 | stage III sphalerite Mean and standard deviation recalculated from 2 analyses, +5.2 to +5.3 (5-73-5(Sp) (stage III) +5.2; 5-73-4(Sp) (stage III) +5.3). Published sphalerite mean +5.3 ‰. Sulfides from 1150 to 1190 m depth. | Li et al. (2017), Isotope geochemistry and geochronology of the Niujuan silver deposit, n… |
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : Non précisé dans la publication
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 16.894 ± 0.042 | 16.837 / 16.932 | 7 | stage II and III pyrite, galena and sphalerite Mean and standard deviation recalculated from 7 analyses, 16.837 to 16.932 (1-73-5 (pyrite, stage II) 16.930; 1-77-6 (pyrite, stage II) 16.932; 5-71-3 (pyrite, stage III) 16.925; 5-73-5(Gn) (galena, stage III) 16.837; 5-73-5(Sp) (sphalerite, stage III) 16.917; 5-73-4(Sp) (sphalerite, stage III) 16.875; 5-73-4(Gn) (galena, stage III) 16.841). Δβ and Δγ calculated at 139 Ma in the mantle lead field according to the authors. | Li et al. (2017), Isotope geochemistry and geochronology of the Niujuan silver deposit, n… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : Non précisé dans la publication
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.477 ± 0.037 | 15.42 / 15.531 | 7 | stage II and III pyrite, galena and sphalerite Mean and standard deviation recalculated from 7 analyses, 15.420 to 15.531 (1-73-5 (pyrite, stage II) 15.501; 1-77-6 (pyrite, stage II) 15.477; 5-71-3 (pyrite, stage III) 15.499; 5-73-5(Gn) (galena, stage III) 15.445; 5-73-5(Sp) (sphalerite, stage III) 15.531; 5-73-4(Sp) (sphalerite, stage III) 15.465; 5-73-4(Gn) (galena, stage III) 15.420). Δβ and Δγ calculated at 139 Ma in the mantle lead field according to the authors. | Li et al. (2017), Isotope geochemistry and geochronology of the Niujuan silver deposit, n… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : Non précisé dans la publication
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 37.785 ± 0.124 | 37.599 / 37.953 | 7 | stage II and III pyrite, galena and sphalerite Mean and standard deviation recalculated from 7 analyses, 37.599 to 37.953 (1-73-5 (pyrite, stage II) 37.872; 1-77-6 (pyrite, stage II) 37.800; 5-71-3 (pyrite, stage III) 37.860; 5-73-5(Gn) (galena, stage III) 37.665; 5-73-5(Sp) (sphalerite, stage III) 37.953; 5-73-4(Sp) (sphalerite, stage III) 37.748; 5-73-4(Gn) (galena, stage III) 37.599). Δβ and Δγ calculated at 139 Ma in the mantle lead field according to the authors. | Li et al. (2017), Isotope geochemistry and geochronology of the Niujuan silver deposit, n… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 2.53 ± 1.08 ‰ | 0.6 / 4.15 ‰ | 10 | stage I and II quartz Mean and standard deviation recalculated from 10 analyses, +0.60 to +4.15 (1-79-4 (stage II, Li et al., 2017) +0.60; 9-78-2 (stage II, Li et al., 2017) +2.50; 9-72-4 (stage I, Li et al., 2017) +3.00; 82lineCM3 (stage I, Li and Geng, 1997) +1.31; ZK83-1 (stage I, Li and Geng, 1997) +2.78; ZK79-3 (stage I, Li and Geng, 1997) +2.62; 82lineCM3 (stage I, Li and Geng, 1997) +4.15; 82lineCM3 (stage I, Li and Geng, 1997) +2.13; TC80 (stage I, Li and Geng, 1997) +2.21; TC82 (stage I, Li and Geng, 1997) +4.01). Water δ18O: 1-79-4 -7.05 ‰ at 280 °C; 9-78-2 -5.15 ‰ at 280 °C; 9-72-4 -3.89 ‰ at 300 °C; 82lineCM3 -5.58 ‰ at 300 °C; ZK83-1 -4.11 ‰ at 300 °C; ZK79-3 -4.27 ‰ at 300 °C; 82lineCM3 -2.74 ‰ at 300 °C; 82lineCM3 -4.76 ‰ at 300 °C; TC80 -4.68 ‰ at 300 °C; TC82 -2.88 ‰ at 300 °C. 82lineCM3 appears three times (one analysis from Li et al., 2017, two from Li and Geng, 1997). The abstract prints "0.6 to -4.15 ‰" for values that are all positive. | Li et al. (2017), Isotope geochemistry and geochronology of the Niujuan silver deposit, n… |
δD in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −108.9 ± 7.6 ‰ | −119.4 / −98.7 ‰ | 7 | fluid-inclusion water in stage I and II quartz Mean and standard deviation recalculated from 7 analyses, -119.4 to -98.7 (1-79-4 (stage II, Li et al., 2017) -104.3; 9-78-2 (stage II, Li et al., 2017) -113.2; 9-72-4 (stage I, Li et al., 2017) -119.4; 82lineCM3 (stage I, Li and Geng, 1997) -98.7; ZK83-1 (stage I, Li and Geng, 1997) -104.8; ZK79-3 (stage I, Li and Geng, 1997) -116.9; 82lineCM3 (stage I, Li and Geng, 1997) -105.0). Mixture of magmatic and meteoric water according to the authors, the meteoric share increasing towards the late stages. | Li et al. (2017), Isotope geochemistry and geochronology of the Niujuan silver deposit, n… |
3He/4He (R/Ra) isotope ratio, no unit Values of the same system
Standard : Air (Ra = 1,4 × 10⁻⁶) : valeurs en R/Ra
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 2.24 ± 2.229 | 0.921 / 4.814 | 3 | pyrite fluid inclusions Mean and standard deviation recalculated from 3 analyses, 0.921 to 4.814 (1-77-6 0.986; 5-71-3 0.921; 9-75-1 4.814). R/Ra calculated from the Table 6 3He/4He (× 10⁻⁶: 1-77-6 1.38; 5-71-3 1.29; 9-75-1 6.74) with Ra = 1.4 × 10⁻⁶ as the authors do (0.921 to 4.81 Ra in the text). Mantle helium from 11.56 to 61.20 %; 4He from 0.09 to 1.26 × 10⁻⁷ cm3 STP/g. | Li et al. (2017), Isotope geochemistry and geochronology of the Niujuan silver deposit, n… |
40Ar/36Ar isotope ratio, no unit Values of the same system
Standard : Air (40Ar/36Ar = 295,5)
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 301.98 ± 2.35 | 299.34 / 303.84 | 3 | pyrite fluid inclusions Mean and standard deviation recalculated from 3 analyses, 299.34 to 303.84 (1-77-6 303.84; 5-71-3 299.34; 9-75-1 302.75). Close to air: air-saturated meteoric water argon according to the authors. | Li et al. (2017), Isotope geochemistry and geochronology of the Niujuan silver deposit, n… |
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Cite this page
IsoFind Atlas (2026). Niujuan, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/niujuan/ (accessed 2026-10-22).
@misc{isofind2026niujuanisotopesignatures,
title = {Niujuan, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/niujuan/},
note = {Accessed 2026-10-22}
}Updated : 2026-10-22