Xiaotongguanshan
Tongguanshan ore field, Tongling, Anhui, China
SkarnsCu (Fe)
- Type
- Copper (magnetite) skarn at the contact of a quartz monzodiorite
Tongling district, Lower Yangtze metallogenic belt: garnet-diopside skarns between the Yanshanian quartz monzodiorite and the carbonates. Four stages: skarn, magnetite, quartz-sulfide, quartz-carbonate. Fluid magmatic first, then enriched in meteoric water (calculated water-rock ratio 0.26); sulfur mostly magmatic with a sedimentary share. Coordinates of Tongling. Indicative coordinates.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 3.2 ± 4.2 ‰ | −9.9 / 6 ‰ | 12 | ore sulfides (pyrite, colloform pyrite, chalcopyrite) Mean and standard deviation recalculated from 12 samples, Table 3: 7 pyrites, 2 colloform pyrites, 3 chalcopyrites. Peaked distribution at 3-6 ‰ (magmatic source); pyrite of the giant quartz-calcite ore (Tgs-4, -9.9 ‰) records sedimentary sulfur input. Vug gypsum: 4.0 ‰. | Tian et al. (2005), REE and stable isotope geochemistry of the Xiaotongguanshan copper de… |
| −1 ± 4.9 ‰ | −4.4 / 2.5 ‰ | 2 | nodular pyrite of host siltstones Mean and standard deviation recalculated from 2 samples, Table 3 (XI-3, TGSP-1): sedimentary pyrite of silicified siltstones, outside the ore. | Tian et al. (2005), REE and stable isotope geochemistry of the Xiaotongguanshan copper de… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 7.8 ± 0.5 ‰ | 7 / 8.3 ‰ | 5 | skarn garnet Mean and standard deviation recalculated from 5 samples, Table 4; calculated fluid 9.4 to 10.7 ‰ at 700-720 °C. Skarn whole rock: 11.2, 9.1 and 14.9 ‰. | Tian et al. (2005), REE and stable isotope geochemistry of the Xiaotongguanshan copper de… |
| 13.6 ± 1.6 ‰ | 11.6 / 15.4 ‰ | 6 | skarn and quartz-sulfide stage quartz Mean and standard deviation recalculated from 6 samples, Table 4: five skarn-stage quartz, two of them from an earlier study (15.4 and 11.8 ‰, reference 2 of the article), and one quartz-sulfide stage quartz (14.7 ‰). | Tian et al. (2005), REE and stable isotope geochemistry of the Xiaotongguanshan copper de… |
| 7.5 ± 1.3 ‰ | 6.6 / 8.4 ‰ | 2 | magnetite Mean and standard deviation recalculated from 2 samples, Table 4, magnetite stage; calculated fluid 13.5 to 15.9 ‰ at 350-400 °C, the heaviest of the deposit. | Tian et al. (2005), REE and stable isotope geochemistry of the Xiaotongguanshan copper de… |
| 14.8 ± 1.6 ‰ | 13.4 / 17.4 ‰ | 5 | late-stage calcite Mean and standard deviation recalculated from 5 samples, Tables 4 and 6: quartz-sulfide stage (15.3, 17.4 and 14.6 ‰) and quartz-carbonate stage calcites (13.4 and 13.5 ‰). Skarn calcites: -4.6/10.1 and 2.1/14.6 ‰. | Tian et al. (2005), REE and stable isotope geochemistry of the Xiaotongguanshan copper de… |
| 22.2 ± 0.2 ‰ | 22 / 22.4 ‰ | 4 | host marbles Mean and standard deviation recalculated from 4 samples, Table 6: host marbles, little-modified marine signature. | Tian et al. (2005), REE and stable isotope geochemistry of the Xiaotongguanshan copper de… |
δ13C in ‰ (per mil) Values of the same system
Standard : V-PDB
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.3 ± 0.8 ‰ | −0.9 / 0.9 ‰ | 5 | late-stage calcite Mean and standard deviation recalculated from 5 samples, Tables 4 and 6: quartz-sulfide stage (15.3, 17.4 and 14.6 ‰) and quartz-carbonate stage calcites (13.4 and 13.5 ‰). Skarn calcites: -4.6/10.1 and 2.1/14.6 ‰. | Tian et al. (2005), REE and stable isotope geochemistry of the Xiaotongguanshan copper de… |
| 1.3 ± 1.4 ‰ | 0.1 / 3.3 ‰ | 4 | host marbles Mean and standard deviation recalculated from 4 samples, Table 6: host marbles, little-modified marine signature. | Tian et al. (2005), REE and stable isotope geochemistry of the Xiaotongguanshan copper de… |
δ30Si in ‰ (per mil) Values of the same system
Standard : NBS 28
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.2 ± 0.1 ‰ | −0.4 / −0.1 ‰ | 5 | skarn garnet Mean and standard deviation recalculated from 5 samples, Table 8. Skarn whole rocks -0.7 and -0.4 ‰, serpentine-talc rock 0.1 ‰; skarn-stage mean given by the authors -0.25 ‰. Quartz monzodiorite (whole rock): -0.3 ‰. | Tian et al. (2005), REE and stable isotope geochemistry of the Xiaotongguanshan copper de… |
| −0.2 ± 0.1 ‰ | −0.3 / −0.2 ‰ | 4 | skarn and quartz-sulfide stage quartz Mean and standard deviation recalculated from 4 samples, Table 8: three skarn quartz and one quartz-sulfide stage quartz (-0.3 ‰). | Tian et al. (2005), REE and stable isotope geochemistry of the Xiaotongguanshan copper de… |
Deposits of the same type
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Cite this page
IsoFind Atlas (2026). Xiaotongguanshan, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/xiaotongguanshan/ (accessed 2026-10-13).
@misc{isofind2026xiaotongguanshanisotopesignat,
title = {Xiaotongguanshan, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/xiaotongguanshan/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13