Erentaolegai
Inner Mongolia, Xin Barag Right Banner (Erguna metallogenic belt), China
Epithermal depositsAg (Pb, Zn)
- Type
- Low-sulfidation (adularia-sericite) epithermal silver in Jurassic andesites
On the west bank of the Kerulen River, 120 km south-west of Manzhouli. Veins 100 to more than 1000 m long around a granite stock, in porphyritic andesites of the Tamolangou Formation (Upper Jurassic); argentite, freibergite, polybasite, native silver, proustite, stromeyerite, with rhodochrosite and adularia. Inclusions at 155 to 348 °C and below 2 wt% NaCl equiv. (earlier work). Granite and quartz porphyry dated at 120 ± 6 Ma (Rb-Sr isochron, initial Sr 0.707463 in Figure 3 and 0.70741 in the text); granite quartz at +10.4 ‰ and quartz porphyry quartz at -0.1 ‰ in δ18O, meteoric water in the magma and the ore (Chen and Zhang, 2004). Indicative coordinates: 120 km south-west of Manzhouli (Chen and Zhang, 2004), to within 30 km.
δ34S in ‰ (per mil) Values of the same system
Standard : Non précisé dans la publication
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 3.185 ± 0.99 ‰ | 1.704 / 4.451 ‰ | 5 | pyrite of the ore veins Mean and standard deviation recalculated from 5 analyses, +1.704 to +4.451 (4 (belt II) +2.999; 5 (belt II) +1.704; 6 (belt III) +4.451; 7 (belt III) +3.316; 8 (belt III) +3.456). All 15 sulfides from -3.960 to +4.451 ‰; 34S enrichment pyrite > sphalerite > galena, close to equilibrium according to the authors. | Chen et Zhang (2004), Isotope geochemistry of Erentaolegai silver deposit, Inner Mongolia… |
| 0.19 ± 2.79 ‰ | −3.96 / 1.912 ‰ | 4 | galena of the ore veins Mean and standard deviation recalculated from 4 analyses, -3.96 to +1.912 (2 (belt I) +1.912; 4 (belt II) +1.743; 7 (belt III) -3.96; 9 (belt IV) +1.052). All 15 sulfides from -3.960 to +4.451 ‰; 34S enrichment pyrite > sphalerite > galena, close to equilibrium according to the authors. | Chen et Zhang (2004), Isotope geochemistry of Erentaolegai silver deposit, Inner Mongolia… |
| 2.94 ± 1 ‰ | 1.251 / 4.077 ‰ | 6 | sphalerite of the ore veins Mean and standard deviation recalculated from 6 analyses, +1.251 to +4.077 (1 (belt I) +4.077; 2 (belt I) +3.042; 3 (belt I) +3.74; 4 (belt II) +2.529; 7 (belt III) +1.251; 9 (belt IV) +3.03). All 15 sulfides from -3.960 to +4.451 ‰; 34S enrichment pyrite > sphalerite > galena, close to equilibrium according to the authors. | Chen et Zhang (2004), Isotope geochemistry of Erentaolegai silver deposit, Inner Mongolia… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −4.2 ± 2.5 ‰ | −7.3 / −0.8 ‰ | 5 | ore-vein quartz Mean and standard deviation recalculated from 5 analyses, -7.3 to -0.8 (3 -2.708; 4 -0.8; 5 -4.7; 6 -5.7; 7 -7.3). Quartz 3 with Mn oxides; 4 with sulfides; 5 with sulfides; 6 with sulfides; 7 comb-shaped. Water δ18O: 3 -14.17; 4 -8.86; 5 -12.76; 6 -13.76; 7 -15.60 ‰. | Chen et Zhang (2004), Isotope geochemistry of Erentaolegai silver deposit, Inner Mongolia… |
| 5.4 ‰ | 1 | calcite of a quartz-calcite vein Single analysis (8). Water δ18O -1.76 ‰ at 240 °C. | Chen et Zhang (2004), Isotope geochemistry of Erentaolegai silver deposit, Inner Mongolia… |
δD in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −148 ± 7 ‰ | −155 / −141 ‰ | 3 | fluid-inclusion water in quartz and calcite Mean and standard deviation recalculated from 3 analyses, -155 to -141 (5 (quartz) -147; 6 (quartz) -155; 8 (calcite) -141). Close to local Mesozoic meteoric water (δ18O from -19 to -20 ‰, δD from -145 to -155 ‰; Zhang Ligang et al., 1995). | Chen et Zhang (2004), Isotope geochemistry of Erentaolegai silver deposit, Inner Mongolia… |
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : Non précisé dans la publication
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 18.5153 ± 0.0798 | 18.4234 / 18.5676 | 3 | galena Mean and standard deviation recalculated from 3 analyses, 18.4234 to 18.5676 (1 18.4234; 2 18.5548; 3 18.5676). Holmes-Houtermans model: 1 negative model age; 2 model age 162 Ma, µ 9.127, ω 9.46, Th/U 1.002; 3 negative model age. Anomalous lead according to the authors, close to that of the quartz porphyry. | Chen et Zhang (2004), Isotope geochemistry of Erentaolegai silver deposit, Inner Mongolia… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : Non précisé dans la publication
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.7069 ± 0.1624 | 15.5676 / 15.8853 | 3 | galena Mean and standard deviation recalculated from 3 analyses, 15.5676 to 15.8853 (1 15.6678; 2 15.8853; 3 15.5676). Holmes-Houtermans model: 1 negative model age; 2 model age 162 Ma, µ 9.127, ω 9.46, Th/U 1.002; 3 negative model age. Anomalous lead according to the authors, close to that of the quartz porphyry. | Chen et Zhang (2004), Isotope geochemistry of Erentaolegai silver deposit, Inner Mongolia… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : Non précisé dans la publication
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 38.6946 ± 0.407 | 38.3944 / 39.1578 | 3 | galena Mean and standard deviation recalculated from 3 analyses, 38.3944 to 39.1578 (1 38.5315; 2 39.1578; 3 38.3944). Holmes-Houtermans model: 1 negative model age; 2 model age 162 Ma, µ 9.127, ω 9.46, Th/U 1.002; 3 negative model age. Anomalous lead according to the authors, close to that of the quartz porphyry. | Chen et Zhang (2004), Isotope geochemistry of Erentaolegai silver deposit, Inner Mongolia… |
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Cite this page
IsoFind Atlas (2026). Erentaolegai, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/erentaolegai/ (accessed 2026-10-22).
@misc{isofind2026erentaolegaiisotopesignatures,
title = {Erentaolegai, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/erentaolegai/},
note = {Accessed 2026-10-22}
}Updated : 2026-10-22