Nanyangtian
Malipo County, Wenshan, south-eastern Yunnan (Laojunshan district), China
SkarnsW
- Type
- Reduced calcic scheelite skarn and scheelite-molybdenite-quartz veins
Very large tungsten deposit (0.34 Mt WO3 at 0.5 to 1.0 %) in the Laojunshan (Song Chay) metamorphic dome: three flat-lying mineralised zones replacing limestones and calcareous schists of the Nanyangtian Formation. Grossular-diopside-tremolite-actinolite skarn, scheelite, pyrrhotite and pyrite; reduced (CH4) fluids of 193 to 298 °C, low salinity. Two episodes: skarn related to a Jurassic granite (zircon at 162.5 ± 3.0 Ma) and scheelite-molybdenite-quartz veins dated at 97.8 ± 0.7 Ma (biotite Ar-Ar), coeval with the Cretaceous Laojunshan granite. Magmatic fluid mixed with meteoric water. Indicative coordinates.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 7.87 ± 0.29 ‰ | 7.46 / 8.07 ‰ | 4 | skarn ore pyrrhotite Mean and standard deviation recalculated from 4 samples, Table 4. Magmatic sulfur. | Zhang et al. (2021), Genesis and geodynamic setting of the Nanyangtian tungsten deposit, … |
| 7.98 ‰ | 1 | skarn ore pyrite One analysis, Table 4. | Zhang et al. (2021), Genesis and geodynamic setting of the Nanyangtian tungsten deposit, … | |
| 8.86 ± 0.71 ‰ | 8.14 / 9.55 ‰ | 3 | skarn ore arsenopyrite Mean and standard deviation recalculated from 3 samples, Table 4. | Zhang et al. (2021), Genesis and geodynamic setting of the Nanyangtian tungsten deposit, … |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 3.6 ± 0.4 ‰ | 2.9 / 4 ‰ | 6 | skarn scheelite (Jurassic) Mean and standard deviation recalculated from 6 samples, Table 5. Diopside, epidote, garnet and diopside-tremolite skarns. | Zhang et al. (2021), Genesis and geodynamic setting of the Nanyangtian tungsten deposit, … |
| 5 ± 0.7 ‰ | 4.4 / 5.7 ‰ | 3 | scheelite from scheelite-molybdenite-quartz veins (Cretaceous) Mean and standard deviation recalculated from 3 samples, Table 5. Heavier than skarn scheelite: another episode and another source according to the authors. | Zhang et al. (2021), Genesis and geodynamic setting of the Nanyangtian tungsten deposit, … |
| 5.5 ± 0.5 ‰ | 5 / 6 ‰ | 3 | grossular (prograde skarn, early stage) Mean and standard deviation recalculated from 3 samples, Table 2. Calculated fluid from 5.4 to 7.1 ‰ (Zheng and Hoefs, 1993). | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| 5.1 ± 0.9 ‰ | 4.1 / 5.7 ‰ | 3 | diopside (prograde skarn, early stage) Mean and standard deviation recalculated from 3 samples, Table 2. Calculated fluid from 2.7 to 4.3 ‰. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| 7 ± 1.5 ‰ | 6 / 8.7 ‰ | 3 | tremolite (ore stage) Mean and standard deviation recalculated from 3 samples, Table 2. Calculated fluid from 4.9 to 7.6 ‰. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| 9.3 ± 0.4 ‰ | 9.1 / 9.6 ‰ | 2 | scheelite-bearing quartz (ore stage) Mean and standard deviation recalculated from 2 samples, Table 2. Calculated fluid at 1.3 ‰: meteoric water input. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| 5.1 ± 0.3 ‰ | 4.7 / 5.5 ‰ | 5 | scheelite (ore stage) Mean and standard deviation recalculated from 5 samples, Table 2. Calculated fluid from 6.1 to 6.6 ‰ (Wesolowski and Ohmoto, 1986). | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| 8.9 ± 0.2 ‰ | 8.8 / 9.1 ‰ | 2 | tourmaline (ore stage) Mean and standard deviation recalculated from 2 samples, Table 2. Calculated fluid at 4.0 and 3.7 ‰. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| 3.9 ± 2.3 ‰ | 2.2 / 5.5 ‰ | 2 | biotite (ore stage) Mean and standard deviation recalculated from 2 samples, Table 2. Calculated fluid at 6.2 and 2.9 ‰. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| 8.6 ‰ | 1 | barren quartz (late stage) One analysis, Table 2. Calculated fluid at -1.9 ‰ (220 °C): dominant meteoric water. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
δD in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −98 ± 6 ‰ | −105 / −89 ‰ | 6 | δD measured on inclusion water, grossular and diopside (prograde skarn) Mean and standard deviation recalculated from 6 samples, Table 2. Lowest values of the deposit. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| −98 ± 5 ‰ | −101 / −92 ‰ | 3 | δD measured on inclusion water, tremolite (ore stage) Mean and standard deviation recalculated from 3 samples, Table 2. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| −75 ± 1 ‰ | −76 / −74 ‰ | 2 | δD measured on inclusion water, scheelite-bearing quartz (ore stage) Mean and standard deviation recalculated from 2 samples, Table 2. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| −84 ± 6 ‰ | −94 / −79 ‰ | 5 | δD measured on inclusion water, scheelite (ore stage) Mean and standard deviation recalculated from 5 samples, Table 2. Skarn scheelite (-94 ‰) is lighter than vein scheelite. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| −92 ± 4 ‰ | −95 / −90 ‰ | 2 | δD measured on inclusion water, tourmaline (ore stage) Mean and standard deviation recalculated from 2 samples, Table 2. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| −86 ± 5 ‰ | −89 / −82 ‰ | 2 | δD measured on inclusion water, biotite (ore stage) Mean and standard deviation recalculated from 2 samples, Table 2. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
| −69 ‰ | 1 | δD measured on inclusion water, barren quartz (late stage) One analysis, Table 2. | Ren et al. (2024), Fluid inclusions and H-O isotopes of the super-large Nanyangtian tungs… |
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Cite this page
IsoFind Atlas (2026). Nanyangtian, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/nanyangtian/ (accessed 2026-10-13).
@misc{isofind2026nanyangtianisotopesignatures,
title = {Nanyangtian, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/nanyangtian/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13